WO2008049350A1

WO2008049350A1 - A method and apparatus for transmitting and receiving the reverse signal in orthogonal frequency division multiplexing system

Info

Publication number: WO2008049350A1
Application number: PCT/CN2007/070332
Authority: WO
Inventors: Bin Li; Yi Luo; Lixia Xue
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2006-10-23
Filing date: 2007-07-20
Publication date: 2008-05-02
Also published as: CN101170532B; CN101170532A

Abstract

In the wireless communication field, a method and apparatus for transmitting and receiving the reverse signal are disclosed. The terminal maps the information frame to be transmitted by the orthogonal code; the sequence scrambled by the cell scrambling code is transmitted by OFDM in frequency domain; the network side receives OFDM signal from frequency domain in order to acquire the received sequence; the received sequence is descrambled by the cell scrambling code; the information frame transmitted by the terminal is descrambled according to the sequence descrambled by the cell scrambling code and all the candidate orthogonal codes. The network side for receiving the signal of the reverse control channel doesn't need to process all of the possible multiple paths signals because of transmitting the signal in frequency domain, therefore, the receiving complexity is reduced significantly, and the terminal only needs to process OFDM modulation instead of DFT or FFT transformation, thus the transmitting complexity is also reduced.

Description

Reverse signal transmitting and receiving method and device in orthogonal frequency division multiplexing system

This application claims priority to Chinese Patent Application No. 200610136469.3, entitled "Reverse Signal Transmitting Method and Equipment in Orthogonal Frequency Division Multiplexing System", filed on October 23, 2006, The content is incorporated herein by reference.

Technical field

The present invention relates to the field of wireless communications, and in particular, to a method and an apparatus for transmitting and receiving a reverse signal in an Orthogonal Frequency Division Multiplexing (OFDM) system.

Background technique

In recent years, multi-carrier transmission technology represented by Orthogonal Frequency Division Multiplexing (OFDM) has received extensive attention. Multi-carrier transmission decomposes data streams into several independent sub-data. The stream, each sub-stream will have a much lower bit rate. Demodulating the corresponding subcarriers with such low bit rate formed low rate multi-state symbols constitutes a plurality of low rate symbol parallel transmission transmission systems.

As a multiplexing technique, OFDM multiplexes multiple signals on different orthogonal subcarriers. The traditional Frequency Division Multiplexing ("FDM") technology divides the bandwidth into several subchannels, and uses the guard band to reduce interference, and simultaneously transmits data on these subchannels. OFDM systems require much less bandwidth than traditional FDM systems. Due to the use of interference-free quadrature carrier technology, there is no need to protect the frequency band between individual carriers, which makes the available spectrum more efficient to use. In addition, OFDM technology can dynamically allocate data transmitted on subcarriers. To achieve maximum data throughput, the multi-carrier modulator can intelligently allocate more data to sub-carriers with good channel conditions.

OFDM encodes the data to be transmitted as frequency domain information, modulates it into a time domain signal, and transmits it on the channel, and performs inverse process demodulation at the receiving end. The modulation and demodulation of the OFDM system can be replaced by Inverse Discrete Fourier Transform (IDFT) and Discrete Fourier Transform (DFT), respectively. The frequency domain data symbols are transformed into time domain data symbols by an N-point IDFT operation, and after carrier modulation, are transmitted to the channel. At the receiving end, the received signal is coherently demodulated, and then the baseband signal is subjected to an N-point DFT operation to obtain a transmitted data symbol. In practical applications, IDFT/DFT can be implemented by Inverse Fast Fourier Transform (IFFT) and Fast Fourier Transform (FFT). Adoption of FFT technology The complexity of the OFDM system is greatly reduced, and high-performance information processing devices such as Programmable Logic Device ("PDD"), Digital Signal Processor ("DSP"), and micro processing The development and application of Micro Processor ("μΡ," for short) makes the implementation of OFDM system easier and becomes the most widely used multi-carrier transmission scheme.

OFDM technology can effectively resist Inter Symbol Interference ("ISI") caused by multipath propagation, and its implementation complexity is much smaller than that of single-carrier systems using equalizers. In addition, the OFDM system can optimize the allocation of information bits transmitted by each subcarrier according to the signal to noise ratio of each subcarrier, thereby greatly increasing the capacity of the system to transmit information. The use of OFDM technology also has certain disadvantages, such as in the reverse transmission of cellular mobile, especially in the reverse control signal transmission, because many mobile users use the same frequency resources together, which is easy to cause mutual interaction between users. interference.

In the IEEE 802.20 standard, in order to improve the communication efficiency of low-rate signals such as control signals, Qualcomm has proposed a scheme using a 1024-bit Walsh code (Walsh code) mapping, as shown in Fig. 1. Show. For each control channel signal, such as a channel quality indicator (CQI), a 10-bit signal is first HADAMA D mapping, that is, selecting from a 1024x1024 HADAMA D orthogonal matrix. One row or one column, a 1024-bit long WALSH code is obtained, and the Walsh code is further scrambled by a channel scrambling code. This scrambling is to distinguish other channels, so the channel scrambling codes of different channels are different. Thereafter, the scrambled Walsh codes of the different channels are added and combined. The combined 1024 bits are further scrambled, which is used to distinguish between different users, cells or sectors. The 1024 bits output after scrambling are divided into 8 sub-blocks, each sub-block contains 128 bits, and then 128 points of FFT are performed for each sub-block, 128 complex values are output, and the resulting 1024 complex values are carried at 128. Subcarriers and 8 symbols.

The receiving end first performs FFT on the channel fading signal through the OFDM receiving system, and then performs 128-point IDFT. These two steps are the inverse process of the OFDM system IFFT modulation and 128-point DFT in the transmitting end. The design of the system actually uses the signal transmission method in the time domain. In the wireless multipath transmission environment, the receiver usually adopts a CDMA (Code Division Multiple Access) RAKE receiver. In order to overcome the offset of the maximum energy path in the multipath channel environment, 8-level cyclic shift is used to perform cyclic shift for each stage. Correlation is performed separately after descrambling. After the 1024-length Walsh code is correlated, there will be 1024 correlation peaks, and each correlation peak corresponds to a 10-bit information. For a 8-level cyclic shift, there will be 8*1024 correlation peaks, and the information bits corresponding to the largest correlation peak are taken as outputs. The structure of the receiving end is shown in Fig. 2 and Fig. 3. Fig. 2 shows the structure of the receiving end of the single antenna, and Fig. 3 shows the structure of the receiving end of the dual antenna.

However, due to the inherent frequency selective fading of OFDM systems and the inherent time-selective fading in mobile communications, different subcarriers produce different amplitude fading at different times, resulting in a 1024-bit long Walsh transmitted by the control channel. The orthogonal codes are no longer orthogonal at the receiving end, so that the receiving performance of the receiver to the control channel is greatly degraded. In addition, when the speed of the system is as high as 250km/h (km/h), the error rate of 10-bit information is very high and cannot meet the requirements of the system. In order to solve these problems, Qualcomm proposed an improved solution using interleaving technology, which greatly improved the performance under high-speed moving conditions.

In the improved solution, after the Walsh code is scrambled by using the cell scrambling code of the terminal, sector or cell at the transmitting end, an interleaver of 1024 bits length is added, and the continuity of the angle extension is changed by the interleaving method. And randomly scattered on a 1024-bit Walsh code, as shown in Figure 4. In the receiving end, on the basis of the above scheme, the descrambled signal is deinterleaved, and the rest remains unchanged. Due to the Doppler shift of the high-speed mobile channel, the channel changes rapidly, and one of the characteristics is that the angle expansion is rapid and continuous. The Walsh code is a regular sequence, which greatly affects the structure of the received signal and destroys the orthogonality of the Walsh code itself. Therefore, the order of transmission of Walsh codes is disturbed by interleaving, and the variation of the angle spread is approximated to random noise, which can improve the performance of the control channel in a high-speed mobile environment.

In the above OFDM system, since the transmitting end uses a 128-point DFT and a 512-point IFFT, the transmitted signal is a time domain signal. Therefore, the receiving end needs to process all possible multipath signals, that is, processing all 8 multipaths, resulting in a very high complexity of the receiver; at the same time, the transmitting end needs to perform DFT or FFT operations, Has a higher complexity.

Summary of the invention

Embodiments of the present invention provide a reverse signal transceiving method and apparatus in an orthogonal frequency division multiplexing system, such that the receiving complexity and transmission complexity of the reverse signal are greatly reduced.

Embodiments of the present invention provide a reverse signaling method in an Orthogonal Frequency Division Multiplexing system, including the following steps: Perform orthogonal code mapping on the information frame to be sent;

The sequence obtained by mapping the orthogonal code is scrambled by a cell scrambling code;

The sequence scrambled by the cell scrambling code is transmitted in the frequency domain in an OFDM manner.

Embodiments of the present invention also provide a reverse signal receiving method in an Orthogonal Frequency Division Multiplexing system, which includes the following steps:

Receiving an OFDM signal from a frequency domain to obtain a received sequence;

Decoding the received sequence with a cell scrambling code;

The transmitted information frame is solved according to the sequence descrambled by the cell scrambling code and all candidate orthogonal codes. An embodiment of the present invention further provides an inverse signal receiving apparatus in an orthogonal frequency division multiplexing system, including:

a receiving module, configured to receive an OFDM signal from a frequency domain;

a second descrambling module, configured to descramble the signal by using a cell scrambling code; and

A decorrelation module is configured to correlate the signal descrambled by the cell with each candidate orthogonal code to solve an information frame sent by the terminal.

The embodiment of the invention further provides a reverse signal sending method in an orthogonal frequency division multiplexing system, which comprises the following steps:

Separating the physical channel resources in one physical frame into at least two time-frequency blocks, each time-frequency block consisting of consecutive sub-carriers and all OFDM symbols in the physical frame;

After the terminal maps the to-be-transmitted signal to an orthogonal code, the terminal transmits in an OFDM manner in one of the time-frequency blocks.

The network side receives the OFDM signal from the time-frequency block, and resolves the information frame sent by the terminal by correlating the received signal with each candidate orthogonal code.

An embodiment of the present invention further provides a terminal device, including:

a mapping module, configured to map the to-be-transmitted signal to an orthogonal code;

a sending module, configured to carry the signal mapped by the mapping module in a continuous subcarrier The time-frequency block composed of all the OFDM symbols in one physical frame is transmitted in an OFDM manner; the time-frequency block is obtained by dividing a physical channel resource in a physical frame in advance, and the physical channel resource is divided into at least two. Time-frequency block.

An embodiment of the present invention further provides an inverse signal receiving apparatus in an orthogonal frequency division multiplexing system, including:

a receiving module, configured to receive an OFDM signal from a time-frequency block composed of consecutive subcarriers and all OFDM symbols in one physical frame; and

a de-correlation module, configured to correlate an OFDM signal received by the receiving module with each candidate orthogonal code, and decode an information frame sent by the terminal;

The time-frequency block is obtained by dividing a physical channel resource in a physical frame in advance, and the physical channel resource is divided into at least two time-frequency blocks.

The embodiment of the present invention further provides an inverse signal sending apparatus in an OFDM system, including: a mapping module, configured to perform orthogonal code mapping on a message frame to be sent;

a second scrambling module, wherein the sequence obtained by orthogonal code mapping is scrambled by a cell scrambling code; and a sending module, configured to send the sequence scrambled by the second scrambling module in the frequency domain by using an OFDM method.

a receiving module, configured to receive an OFDM signal from a frequency domain, to obtain a receiving sequence;

a second descrambling module, configured to descramble the received sequence by using a cell scrambling code; and

An information frame recovery module is configured to solve the transmitted information frame according to the sequence descrambled by the cell scrambling code and all candidate orthogonal codes.

In the embodiment of the present invention, the to-be-transmitted signal is orthogonally coded in the terminal, and then scrambled by the cell scrambling code, and the scrambled signal is transmitted in the frequency domain in an OFDM manner; the network side receives the OFDM from the frequency domain. The signal, after the received signal is descrambled by the cell scrambling code, combines all possible candidate orthogonal codes to solve the information frame sent by the terminal. Since the signal is transmitted in the frequency domain, the network side receiving the reverse control channel signal does not need to process all possible multipath signals, thereby greatly reducing the reception complexity; and, the terminal only needs to perform OFDM modulation without DFT or The FFT transform also reduces the transmission complexity. DRAWINGS

1 is a schematic diagram of transmitting a reverse control channel signal in the prior art;

2 is a schematic diagram of a single antenna receiving a reverse control channel signal in the prior art;

3 is a schematic diagram of a dual antenna receiving a reverse control channel signal in the prior art;

4 is a schematic diagram of interleaving a reverse control channel signal in the prior art;

5 is a flowchart of a reverse signal transmitting method in an OFDM system according to a first embodiment of the present invention; FIG. 6 is a schematic diagram of a reverse signal transmitting method in an OFDM system according to a first embodiment of the present invention; FIG. 7 is a second embodiment of the present invention. FIG. 8 is a schematic diagram of a reverse signal receiving method in an OFDM system according to a second embodiment of the present invention; FIG. 9 is a reverse signal receiving method in an OFDM system according to a third embodiment of the present invention; FIG. 10 is a schematic diagram of a method for transmitting a reverse signal in an OFDM system according to a fourth embodiment of the present invention; FIG. 11 is a schematic diagram of a method for receiving a single antenna corresponding to a method for transmitting a reverse signal in an OFDM system according to a fourth embodiment of the present invention;

12 is a schematic diagram of a dual antenna receiving method corresponding to a reverse signal transmitting method in an OFDM system according to a fourth embodiment of the present invention;

13 is a schematic diagram of dividing a time-frequency block in a reverse signal transmitting method in an OFDM system according to a seventh embodiment of the present invention;

14 is a schematic diagram of a reverse signal transmission method in an OFDM system according to a seventh embodiment of the present invention; FIG. 15 is a schematic diagram of a reverse signal reception method in an OFDM system according to an eighth embodiment of the present invention; FIG. 17 is a schematic diagram of dividing a time-frequency block in a reverse signal transmitting method in an OFDM system according to a tenth embodiment of the present invention; FIG.

18 is a schematic diagram of a reverse signal transmission method in an OFDM system according to a tenth embodiment of the present invention; FIG. 19 is a schematic diagram of a reverse signal transmission method of an OFDM system according to an eleventh embodiment of the present invention; A schematic diagram of selecting a time-frequency block over time in a reverse signal transmission method in an OFDM system;

21 is a schematic diagram of reverse signal reception in an OFDM system corresponding to time-frequency block selection over time in a nine embodiment of the present invention;

22 is a timing of a reverse signal transmission method in an OFDM system according to an eleventh embodiment of the present invention; Schematic diagram of selecting a time-frequency block between changes;

Figure 23 is a block diagram showing a structure of a reverse signal transmitting apparatus in an OFDM system according to a fourteenth embodiment of the present invention; and Figure 24 is a block diagram showing a structure of a reverse signal receiving apparatus in an OFDM system according to a fifteenth embodiment of the present invention. detailed description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings.

The first embodiment of the present invention relates to a reverse signal transmitting method in an OFDM system. In the present embodiment, a signal to be transmitted of a terminal is a control information frame, and a signal to be transmitted is converted into a frequency domain signal.

As shown in FIG. 5, in step 510, the terminal maps the to-be-transmitted signal of each control channel to an orthogonal code. In this embodiment, the orthogonal code is a Walsh code. For example, as shown in Figure 6, the terminal passes the CQI, REQ (request) and 10-bit pending signals of other control channels through the Walsh code mapping, so that each control channel obtains a 1024-bit signal.

Next, proceeding to step 520, the terminal scrambles and combines the signals of the respective control channels by channel scrambling codes. For the above case, the terminal scrambles the 1024-bit signal of each control channel with a corresponding channel scrambling code, which is generated according to the MAC ID (Media Access Layer Identity) and different control channels, and thus can Differentiate different control channels of different terminals. Then, the CQI, REQ, and the 1024-bit signal scrambled by the channel scrambling code of the other control channels and the 1024-bit pilot signal are combined to obtain a 1024-bit signal sequence, as shown in FIG. 6. By scrambling the signals mapped to the orthogonal codes, different control channels of different terminals are distinguished, so that each time-frequency block carries signals of multiple terminals, and each terminal can have signals of multiple channels, thereby ensuring channel resources. Can be fully utilized.

Next, proceeding to step 530, the terminal interleaves the combined signals, and then re-scrambles the interleaved signal by using a cell scrambling code, where the cell includes an omnidirectional cell or a sectorized cell. For the above case, the terminal interleaves the combined 1024-bit signal sequence, and then scrambles the interleaved signal with the cell scrambling code to distinguish different cells or sectors, as shown in FIG. 6. Since the terminal interleaves the signals mapped to the orthogonal codes, the transmission performance of the reverse control signals of the terminal in the case of high-speed movement is further improved.

Next, proceeding to step 540, the terminal transmits the re-scrambled signal in the frequency domain in an OFDM manner, as shown in FIG. 6. Compared with the prior art, the signal scrambled by the cell scrambling code is subjected to DFT. After the transform and the OFDM modulation are transmitted in the time domain, in the embodiment, the signal scrambled by the cell scrambling code is OFDM-modulated and transmitted, and in the embodiment, the signal is transmitted in the frequency domain, so that the reverse control channel signal is received. The network side does not need to process all possible multipath signals, so the receiving complexity is greatly reduced. At the same time, the transmitting end does not need to perform the DFT transform in the prior art, and the transmission complexity is also reduced.

A second embodiment of the present invention relates to a method for receiving a reverse signal in an OFDM system. The present embodiment corresponds to the transmission method in the first embodiment. The receiving method in the present embodiment is a single antenna receiving method. Shown.

In step 710, the network side receives the OFDM signal from the frequency domain. Since the transmission signal of the terminal is transmitted in the frequency domain, the network side only needs to search on one path, which greatly reduces the reception complexity, as shown in FIG.

Next, proceeding to step 720, the network side descrambles the received OFDM signal with the cell scrambling code, and then deinterleaves the descrambled signal, as shown in FIG.

Next, proceeding to step 730, the network side descrambles the deinterleaved signal again with the channel scrambling code. That is to say, the network side descrambles the signal descrambled by the small area scrambling code by using the channel scrambling code generated by the MAC ID and the different control channels to obtain the control channel signals of each terminal. For example, the network side uses the channel scrambling code of the CQI channel of a terminal to perform descrambling on the signal descrambled by the cell scrambling code to obtain a 1024-bit signal of the CQI channel of the terminal.

Next, proceeding to step 740, the network side correlates the signal descrambled by the channel scrambling code with each candidate orthogonal code to solve the control information frame sent by the terminal. Specifically, as shown in FIG. 8, the network side correlates the signal descrambled by the channel scrambling code with the Walsh code of 1024-bit length, and has 1024 correlation peaks, and each correlation peak corresponds to a 10-bit information. The 10 information bits corresponding to the largest correlation peak are output as the information frame of the terminal on the control channel.

A third embodiment of the present invention relates to a reverse signal receiving method in an OFDM system, and the present embodiment is substantially the same as the receiving method in the second embodiment, except that in the first embodiment, the network side receives through a single antenna. The OFDM signal, and in the present embodiment, the network side receives the OFDM signal through the dual antenna.

Specifically, as shown in FIG. 9, the network side receives an OFDM signal from the frequency domain through a dual antenna. The processing of the OFDM signal received from the frequency domain is substantially the same as that of the second embodiment, and the difference is only in Then, the received signals received from the antennas are combined and the information frames sent by the terminal are solved. That is to say, the signals received from the two antennas and the correlated signals are combined, and finally the combined 1024 correlation peaks are obtained, and the 10-bit information corresponding to the largest correlation peak is taken as the information of the terminal on the control channel. Frame output. In the present embodiment, the spatial diversity gain of the reverse control signal is achieved by using two antennas to receive the reverse control signal of the terminal.

A dual antenna receiving method is described in this embodiment. Those skilled in the art may know that receiving an OFDM signal for three antennas and three or more antennas may be implemented by referring to this embodiment.

A fourth embodiment of the present invention relates to a reverse signal transmitting method in an OFDM system. The present embodiment is substantially the same as the first embodiment except that in the first embodiment, the step of interleaving a signal by a terminal is in a cell. The scrambling code is executed before scrambling the combined signal. In the present embodiment, the step of interleaving the signal by the terminal is performed after the combined signal is scrambled by the cell scrambling code.

Specifically, the terminal first re-scrambles the combined signal by using the cell scrambling code, and then interleaves the re-scrambled signal, and transmits the interleaved signal in the frequency domain by using OFDM, as shown in FIG. 10 Shown.

Corresponding to the transmission method of the present embodiment, the reception method of the reverse signal is similar to that of the second embodiment or the third embodiment. If the network side receives the reverse signal through a single antenna, it is similar to the second embodiment, except that the network side first deinterleaves the received OFDM signal, and then performs two descrambling on the deinterleaved signal. As shown in FIG. 11 , if the network side receives the reverse signal through the dual antenna, it is similar to the third embodiment, and the difference is only that the network side first deinterleaves the received OFDM signal, and then deinterleaves the received OFDM signal. The signal is descrambled twice, as shown in Figure 12.

Of course, the terminal may also interleave the signals mapped to the orthogonal codes first, and then perform scrambling by the channel scrambling code, or the signals mapped to the orthogonal codes and scrambled by the channel scrambling codes. Interleaving is performed, and the interleaved channel signals are combined. The network side only needs to adopt the corresponding reverse process to obtain the information frame sent by the terminal.

A fifth embodiment of the present invention relates to a terminal device, including: a mapping module, configured to map a to-be-transmitted signal into an orthogonal code; and a first scrambling module, configured to map, by using a channel scrambling code, a mapping belonging to a different channel into an orthogonal code. The subsequent signals are respectively scrambled and output; the merging module is configured to combine the signals output by the first scrambling module and output the same; the interleaving module is configured to interleave the signals and output the second scrambling module, After the signal is scrambled again by the cell scrambling code, the transmitting module is configured to send the signal in the frequency domain by using OFDM.

The signal output by the merging module may be interleaved by the interleaving module, and then the signal output by the interleaving module is re-scrambled by the second scrambling module, and the transmitting module outputs the signal of the second scrambling module in the OFDM manner. Transmitting in the domain; the signal output by the merging module may be scrambled again by the second scrambling module, and then the signal output by the second scrambling module is interleaved by the interleaving module, and the transmitting module outputs the interleaving module in OFDM mode. The signal is sent in the frequency domain. Since the signal is transmitted in the frequency domain, the network side receiving the reverse control channel signal does not need to process all possible multipath signals, thereby greatly reducing the reception complexity.

A sixth embodiment of the present invention relates to an inverse signal receiving apparatus in an OFDM system, including: a receiving module, configured to receive an OFDM signal from a frequency domain; a deinterleaving module, configured to deinterleave a signal and output the first descrambling a module, configured to descramble the signal after channel scrambling, and output; a second descrambling module, configured to descramble the signal by using a cell scrambling code; and a correlation module, configured to use the signal and each candidate orthogonal code Correlate, solve the information frame sent by the terminal.

The OFDM signal received by the second descrambling module is descrambled and outputted by the second descrambling module, and then the signal output by the second descrambling module is deinterleaved by the deinterleaving module, and the first descrambling module is used. The signal outputted by the deinterleaving module is descrambled again by the channel scrambling code; the received OFDM signal may be deinterleaved and output by the deinterleaving module, and then the second descrambling module uses the cell scrambling code pair deinterleaving module. The output signal is descrambled, and the signal line output by the second descrambling module is descrambled again by the first descrambling module with the channel scrambling code. The decorrelation module correlates the signal output by the first descrambling module with each candidate orthogonal code to solve the information frame sent by the terminal.

It should be noted that the receiving device may further include a merge module for combining signals. For example, the receiving module receives the OFDM signal from the frequency domain through at least two antennas, and performs deinterleaving by the deinterleaving module respectively, and then the de-interleaved module correlates the deinterleaved signals with the candidate orthogonal codes respectively. The merging module combines the signals received from the antennas and the correlated signals output by the decorrelation module to solve the information frames sent by the terminal. Thereby the spatial diversity gain of the reverse control signal is achieved.

A seventh embodiment of the present invention relates to a reverse signal transmitting method in an OFDM system. In this embodiment, a physical channel resource in one physical frame is divided into at least two time-frequency blocks in advance, and each time-frequency block is composed of consecutive sub-blocks. The carrier and all OFDM symbols in the physical frame are composed. For example, a physics The physical channel resource in the frame is composed of 128 subcarriers and 8 symbols, and the physical channel resource can be divided into two time-frequency blocks, and each time-frequency block is composed of 64 sub-carriers and 8 symbols, as shown in FIG. . After the terminal maps the to-be-transmitted signal to an orthogonal code, the terminal transmits the signal in an OFDM manner in a time-frequency block.

Specifically, the terminal scrambles the signals mapped to the different channels and belongs to the orthogonal codes by the channel scrambling code, and combines the scrambled channel signals. For the channel whose information frame length to be transmitted is greater than the information length n that the time-frequency block can carry, the terminal divides the information frame of the channel into two parts, n and m bits, and uses the n-bit part as the information carried in the physical resource. And selecting an interleaving or scrambling manner according to the m-bit portion, interleaving or scrambling the n-bit portion after orthogonal code mapping according to the selected interleaving or scrambling manner, and then interleaving or scrambling the channel scrambling code pair The signal is scrambled. Then, the signal scrambled by the channel scrambling code and the combined signal are scrambled again by the cell scrambling code, and the re-scrambled signal is carried in a time-frequency block and transmitted in OFDM mode.

For example, as shown in FIG. 14, in the present embodiment, each time-frequency block is composed of 64 subcarriers and 8 symbols, and the length of information that one time-frequency block can carry is 9 bits, because channel 1 and channel 2 The length of the information frame to be transmitted is 9 bits, so the signals mapped to the orthogonal codes in channel 1 and channel 2 can be directly scrambled by the corresponding channel scrambling code; the information frame to be transmitted due to channel k The length is 10 bits, which is greater than the length of information that can be carried by a time-frequency block. Therefore, the 10-bit signal of the channel needs to be divided into 9 bits and 1 bit, and the 9-bit part is used as information carried in the physical resource, and according to 1 The bit portion selects the interleaving or scrambling mode. In this embodiment, the interleaving mode is selected. Then, the 9-bit portion after the orthogonal code mapping is interleaved according to the selected interleaving manner, and then the interleaved signal is performed by the channel scrambling code. Scrambled. It can be seen that the scheme of the present invention can also be applied to a longer control channel signal, which expands the application range of the solution of the present invention.

Then, the terminal re-scrambles the channel scrambled signal scrambled by each channel by using the cell scrambling code, and the re-scrambled signal is carried in a time-frequency block and transmitted in OFDM mode. In the present embodiment, the effect of selective fading in the frequency domain on the signal when transmitting in the frequency domain is reduced by partitioning in frequency.

For the above case, the terminal scrambles the cell scrambling code according to its MAC-ID (Media Access Layer Identification Number), or its own identification number or other unique information, or randomly selects a time-frequency block carrying the signal of the terminal. The subsequent signal is transmitted in OFDM mode in the selected one of the time-frequency blocks. Since the terminal signal carried by one time-frequency block is a channel generated according to the MAC ID and different control channels The scrambled signal is scrambled. Therefore, each time-frequency block can carry signals of multiple terminals, and each terminal can transmit signals of multiple control channels, thereby ensuring that channel resources can be fully utilized.

In addition, since the terminal selects the time-frequency block carrying the signal of the terminal according to the MAC ID, or the own identification number or other unique information, the number of users carried by each time-frequency block is relatively uniform, without increasing the overhead. In the case of a better distribution effect. Of course, as long as the distribution effect of the number of users carried by each time-frequency block is relatively uniform, it is not limited to the selection method of the time-frequency block in the present embodiment.

The eighth embodiment of the present invention relates to a reverse signal receiving method in an OFDM system, and the present embodiment corresponds to the transmitting method in the seventh embodiment.

Specifically, as shown in FIG. 15, the network side receives an OFDM signal from a time-frequency block composed of consecutive subcarriers and all OFDM symbols in one physical frame, and first descrambles the received OFDM signal with a cell scrambling code. Then, the descrambled signal is descrambled again by the channel scrambling code, and the descrambled signal is correlated with each candidate orthogonal code to solve the information frame sent by the terminal.

For the channel whose information frame length needs to be transmitted is greater than the information length n that the time-frequency block can carry, the network side deinterleaves the channel-disturbed signal descrambled by the channel according to all possible interleaving or scrambling modes of the terminal. De-scrambling, in the embodiment, performing deinterleaving, and correlating each sequence after de-interleaving with each candidate orthogonal code, and obtaining n bits of the channel that are carried in the physical channel resource according to the obtained optimal signal sequence. The partial information, ^^ according to the interleaving manner corresponding to the optimal signal sequence, obtains information of the remaining part of the m-bit of the channel.

A ninth embodiment of the present invention relates to a reverse signal transmitting method in an OFDM system, and the present embodiment is substantially the same as the seventh embodiment except that in the seventh embodiment, the terminal will perform the twice scrambled signal. The direct bearer is transmitted in an OFDM manner in a time-frequency block. In the present embodiment, the terminal interleaves the twice scrambled signal before transmitting the signal, so as to further improve the terminal in the case of high-speed movement. The transmission performance of the signal is controlled, and then the interleaved signal is carried in an OFDM manner in a time-frequency block, as shown in FIG.

The receiving method corresponding to the present embodiment is substantially the same as the eighth embodiment except that the network side deinterleaves the OFDM signal before the received OFDM signal is descrambled by the cell scrambling code, and then uses the cell. The scrambling code descrambles the deinterleaved signal.

In addition, the selection of the time-frequency block of the bearer signal by the terminal may change with time, as shown in the figure. 20 is shown. Accordingly, the network side needs to receive the OFDM signal in a corresponding manner, as shown in FIG. It is worth mentioning that the interleaving step of the terminal to the signal can also be performed before the signal is scrambled by the cell scrambling code. That is, before the terminal scrambles the combined signal by the cell scrambling code, the terminal interleaves the combined signal, and then re-scrambles the interleaved signal with the cell scrambling code, and then re-scrambles the signal. The latter signal is carried in OFDM by a time-frequency block.

Correspondingly, in the network side, before the signal descrambled by the cell scrambling code is descrambled again by the channel scrambling code, the signal descrambled by the cell scrambling code is deinterleaved, and then the channel scrambling code pair is used. The deinterleaved signal is descrambled again.

Certainly, the terminal may first perform interleaving on the signals mapped to the orthogonal codes, and then perform scrambling on the channel scrambling codes, or perform mapping on each channel to an orthogonal code and scramble the channel scrambling code. The signals are interleaved, and the interleaved channel signals are combined. The network side only needs to adopt the corresponding inverse process to obtain the information frame sent by the terminal.

A tenth embodiment of the present invention relates to a reverse signal transmitting method in an OFDM system, and the present embodiment is substantially the same as the seventh embodiment except that in the seventh embodiment, physical channel resources in one physical frame are divided. For the two time-frequency blocks, each time-frequency block is composed of 64 sub-carriers and 8 symbols. In this embodiment, the physical channel resources in one physical frame are divided into four time-frequency blocks, each time-frequency. The block consists of 32 subcarriers and 8 symbols, as shown in Figure 17.

Therefore, the length of the information frame that each time-frequency block can carry is 8 bits. For a channel whose information frame length is greater than 8 bits, the information frame length to be transmitted is 10 bits, and the terminal needs information about the channel. It is divided into two parts of 8 and 2 bits, and the 8-bit part is used as the information carried in the physical resource, and the interleaving or scrambling mode is selected according to the 2-bit part. In this embodiment, the interleaving mode is selected, and according to the selected interleaving mode. The 8-bit portion after orthogonal code mapping is interleaved, and the interleaved signal is scrambled by the channel scrambling code, as shown in FIG.

The receiving method corresponding to the present embodiment is similar to the eighth embodiment, and will not be described here. An eleventh embodiment of the present invention relates to a reverse signal transmitting method in an OFDM system. The present embodiment is substantially the same as the tenth embodiment except that in the tenth embodiment, the terminal will be scrambled twice. The signal is directly transmitted in a time-frequency block and transmitted in an OFDM manner. In the embodiment, the terminal interleaves the twice-scrambled signal before transmitting the signal, so as to further improve the terminal in the case of high-speed movement. Reverse control signal transmission performance, then carry the interleaved signal It is transmitted in OFDM in a time-frequency block, as shown in FIG. Of course, the selection of the time-frequency block of the bearer signal by the terminal may change with time, as shown in FIG.

The receiving method corresponding to the present embodiment is similar to the eighth embodiment except that the network side deinterleaves the OFDM signal before the received OFDM signal is descrambled by the cell scrambling code, and then uses the cell. The scrambling code descrambles the deinterleaved signal and is not mentioned here.

One of ordinary skill in the art will appreciate that all or part of the steps in implementing the above method embodiments may be accomplished by a program instructing the associated hardware, which may be stored in a computer step. The storage medium may be a read only memory, a random access memory, a magnetic disk, an optical disk, or the like.

A twelfth embodiment of the present invention relates to a terminal device, including: a mapping module, configured to map an information frame to be transmitted into an orthogonal code; and a first scrambling module, configured to map the mapped signal by using a channel scrambling code After the scrambling is performed, the combining module is configured to combine the signals output by the first scrambling module and output the same; the interleaving module is configured to interleave and output the signal; and the second scrambling module is configured to use the cell scrambling code pair The signal is re-scrambled and outputted; the sending module is configured to carry the signal in a time-frequency block consisting of consecutive subcarriers and all OFDM symbols in one physical frame, and transmit in OFDM. The time-frequency block is obtained by dividing a physical channel resource in a physical frame in advance, and the physical channel resource is divided into at least two time-frequency blocks. The effect of selective fading in the frequency domain on the signal is reduced by partitioning in frequency to reduce transmission in the frequency domain.

The signal output by the merging module may be interleaved by the interleaving module, and then the signal output by the interleaving module is re-scrambled by the second scrambling module, and the transmitting module carries the signal output by the second scrambling module at a time frequency. The block is sent by OFDM; the signal output by the merging module may be scrambled again by the second scrambling module, and then the signal output by the second scrambling module is interleaved by the interleaving module, and the transmitting module outputs the output of the interleaving module. The signal is carried in OFDM by a time-frequency block. The interleaving of the signals by the interleaving module further improves the reverse control signal transmission performance of the terminal under high-speed movement.

A thirteenth embodiment of the present invention relates to an inverse signal receiving apparatus in an OFDM system, including: a receiving module, configured to receive an OFDM signal from a time-frequency block composed of consecutive subcarriers and all OFDM symbols in one physical frame, The time-frequency block is obtained by dividing a physical channel resource in a physical frame in advance, and the physical channel resource is divided into at least two time-frequency blocks; After de-interleaving the signal, the first descrambling module is configured to descramble the signal after channel scrambling, and the second descrambling module is configured to perform descrambling on the signal by using the cell scrambling code; The correlation module is configured to correlate the signal with each candidate orthogonal code to solve the information frame sent by the terminal.

The fourteenth embodiment of the present invention relates to an inverse signal transmitting apparatus in an OFDM system. A possible structure is as shown in FIG. 23, including: a mapping module 2310, configured to map a signal to be transmitted into an orthogonal code; The scrambling module 2320 is configured to perform scrambling on the signals mapped to the orthogonal codes by the mapping module 2310 belonging to different channels by using the channel scrambling code, and the combining module 2330 is configured to scramble the first scrambling module 2320. After the signals are combined and output, the interleaving module 2360 is configured to perform interleaving on the signals before being mapped to the orthogonal codes and before the OFDM transmission, and the second scrambling module 2340 is configured to combine the cells by using the scrambling code. The combined signal of the module 2330 is again scrambled and output; the transmitting module 2350 is configured to transmit the signal scrambled by the second scrambling module 2340 in the frequency domain in an OFDM manner.

Wherein, the interleaving module 2360 may be omitted when the transmission performance requirement of the reverse control signal is low in the case of high speed movement. In addition, the interleaving module 2360 can be connected in any position between the mapping module 2310 and the sending module 2350. For example, the signal output by the combining module 2330 can be interleaved by the interleaving module 2360, and then the interleaving module is performed by the second scrambling module 2340. The signal output by the 2360 is re-scrambled, and the sending module 2350 transmits the signal output by the second scrambling module 2340 in the frequency domain in an OFDM manner. The signal output by the merging module 2330 may be first performed by the second scrambling module 2340. After scrambling, the signal output by the second scrambling module 2340 is interleaved by the interleaving module 2360, and the transmitting module 2350 transmits the signal output by the interleaving module 2360 in the frequency domain in an OFDM manner. Since the signal is transmitted in the frequency domain, the network side receiving the reverse control channel signal does not need to process all possible multipath signals, thereby greatly reducing the reception complexity. A fifteenth embodiment of the present invention relates to an inverse signal receiving apparatus in an OFDM system. A possible structure is as shown in FIG. 24, including: a receiving module 2410, configured to receive an OFDM signal from a frequency domain and perform OFDM solution on the OFDM signal. Tuning, obtaining a receiving sequence; de-interleaving module 2450, configured to de-interleave the signal before the information frame recovery module 2440 is demodulated by the receiving module 2410, and output the second pre-scrambling module 2420, The cell scrambling code is descrambled and outputted by the demodulated signal of the receiving module 2410. The first descrambling module 2430 is configured to perform descrambling again after the signal descrambled by the second descrambling module 2420 is decoded by the channel scrambling code. The information frame recovery module 2440 is configured to solve the transmitted information frame according to the sequence of the cell scrambling descrambling and all candidate orthogonal codes. The information frame recovery module 2440 includes: a correlation operation sub-module, configured to correlate the twice descrambled signal with each candidate orthogonal code to obtain all correlation peaks; and a maximum correlation peak sub-module for finding all relevant The maximum correlation peak in the peak, the corresponding control information is the information frame sent by the terminal.

The receiving device may not include the deinterleaving module 2450 when the transmitting end does not include the interleaving module. Similarly, the de-interleaving module 2450 may be located between the receiving module 2410 and the information frame recovery module 2440 at any position corresponding to the transmitting end. For example, the second descrambling module 2420 may first solve the received OFDM signal by using the cell scrambling code. After the interference is output, the signal output by the second descrambling module 2420 is deinterleaved by the de-interleaving module 2450, and the signal output by the de-interleaving module 2450 is again descrambled by the first descrambling module 2430 by the channel scrambling code; The received OFDM signal is deinterleaved and output by the de-interleaving module 2450, and then the second descrambling module 2420 descrambles the signal output by the de-interleaving module by using the cell scrambling code, and the channel is buffered by the first descrambling module 2430. The scrambling code again descrambles the signal line output by the second descrambling module 2420.

It should be noted that when the receiving device includes k (k is an integer greater than or equal to 2) receiving antennas, the information frame recovery module 2440 may further include a merging submodule for demodulating, deinterleaving, and OFDM respectively. The correlation results in the k-group correlation results obtained after the secondary descrambling and correlation operations are combined one by one, and all the combined correlation results are output to the maximum correlation peak sub-module; wherein each group of correlation results corresponds to the received signal of one antenna. For example, the receiving module receives the OFDM signal from the frequency domain through at least two antennas, and performs deinterleaving by the deinterleaving module 2450, respectively, and then the deinterleaved signal is correlated with each candidate orthogonal code by the correlation operation submodule. After the two sets of correlation results are output, the merging sub-module combines the received signals received from the respective antennas and the correlated signals output by the relevant operation sub-module, and the information frame sent by the terminal is obtained by the maximum correlation peak sub-module. Thus implementing a reverse control signal Spatial diversity gain.

A sixteenth embodiment of the present invention relates to a reverse signal transmitting apparatus in an OFDM system, the structure of which is substantially the same as that of the transmitting apparatus in the fourteenth embodiment, except that the transmitting module includes a time-frequency block selecting sub-module and a time-frequency The block sends the submodule. The time-frequency block selection sub-module is configured to: according to the media access layer identification number MAC-ID, the terminal identification number, the time change, or randomly select the time-frequency block that carries the sequence scrambled by the second scrambling module, and The selected time-frequency block informs the time-frequency block transmission sub-module. The time-frequency block transmission sub-module is configured to carry the sequence scrambled by the second scrambling module in a time-frequency block determined by the time-frequency block selection sub-module, and send the signal in an OFDM manner. The time-frequency block is obtained by dividing a physical channel resource in a physical frame in advance, and the physical channel resource is divided into at least two time-frequency blocks, and each time-frequency block can be composed of consecutive sub-carriers and all physical frames. OFDM symbol composition. By dividing the frequency, the effect of selective fading in the frequency domain on the signal is reduced when transmitting in the frequency domain.

If the length of the information frame to be sent on a certain channel exceeds the length n of information that can be carried by the time-frequency block, an information frame splitting module may be added in the mapping module, and the information frame to be transmitted is split into n-bit parts. And the m-bit portion, the n-bit portion is mapped to an orthogonal code, and the orthogonal code is interleaved and scrambled in an interleaving and scrambling manner corresponding to the m-bit portion. The information frame splitting module outputs the interleaved and scrambled signals to the first scrambling module. For the channel of the information length n that the length of the information frame to be transmitted does not exceed one time-frequency block, the mapping module still maps the information to be transmitted into an orthogonal code. The transmitting device in the present embodiment and the fourteenth embodiment may be a terminal device.

A seventeenth embodiment of the present invention relates to an inverse signal receiving apparatus in an OFDM system, the structure of which is substantially the same as that of the receiving apparatus in the fifteenth embodiment, except that the receiving module includes a time-frequency block receiving sub-module for Receiving an OFDM signal from a time-frequency block consisting of consecutive subcarriers and all OFDM symbols in a physical frame, wherein the time-frequency block is obtained by dividing a physical channel resource in a physical frame in advance, and the physical channel resource is divided into At least two time-frequency blocks.

If the length of the information frame transmitted on a certain channel exceeds the length n of the information that the time-frequency block can carry, the information recovery module may include: a demapping sub-module for all possible 2 ^m interleaving or scrambling modes. The channel descrambled by the channel scrambling code is deinterleaved or descrambled; the correlation operation submodule is configured to correlate the deinterleaved or descrambled 2 ^m sequences with each candidate orthogonal code to obtain 2 ⁿ * 2 ^m correlation results; a maximum correlation peak sub-module, configured to obtain ⁿ carried in the physical channel resource on the channel according to the optimal signal sequence in the 2 ⁿ * 2 ^m signal sequences obtained by the correlation operation sub-module The bit portion obtains the remaining part of the channel m bits according to the interleaving or scrambling method corresponding to the optimal signal sequence, and combines the m bits and the n-bit portion into the information frame transmitted by the terminal.

In the embodiment of the present invention, the terminal maps the to-be-transmitted signal to an orthogonal code and then transmits the OFDM signal in the frequency domain, and the network side receives the OFDM signal from the frequency domain, and performs correlation with each candidate orthogonal code to solve the terminal sending. Information frame. Since the signal is transmitted in the frequency domain, the network side receiving the reverse control channel signal does not need to process all possible multipath signals, thereby greatly reducing the reception complexity; and, because the terminal pair maps the signal after the orthogonal code Interleaving is performed, thereby further improving the reverse control signal transmission performance of the terminal in the case of high speed movement. This interleaving scheme also reduces the effect of selective fading on the frequency on the signal. The step of interleaving may be performed before the merging signal is scrambled by the cell scrambling code, or may be performed after the merging signal is scrambled by the cell scrambling code. In the embodiment of the present invention, the mapping is orthogonal code. The latter signal is scrambled to distinguish different control channels of different terminals, so that each time-frequency block carries signals of multiple terminals, and each terminal can have multiple channels of signals, which ensures that channel resources can be fully utilized;

The network side can use at least two antennas to receive the reverse control signal of the terminal, and realize the spatial diversity gain of the reverse control signal;

In addition, the physical channel resource in one physical frame is divided into at least two time-frequency blocks in advance, each time-frequency block is composed of consecutive sub-carriers and all consecutive OFDM symbols in the physical frame, and the terminal maps the to-be-transmitted signal to After the orthogonal code, the bearer is transmitted in an OFDM manner in one of the time-frequency blocks, and the OFDM signal is received from the time-frequency block on the network side, and the received signal is correlated with each candidate orthogonal code to solve the sent by the terminal. Information frame. Since there is inherent frequency selective fading in an OFDM system, the effect of selective fading in the frequency domain on the signal when transmitting in the frequency domain can be reduced by partitioning in frequency. At the same time, the order of the Walsh code is reduced, which greatly reduces the complexity of the receiving end when performing correlation operations;

The terminal obtains the time-frequency block of the signal carrying the local terminal according to the media access layer identification number, its own identification number, or randomly, so that the number of users carried by each time-frequency block is relatively uniform, and is obtained without increasing the overhead. a better distribution effect;

For a channel whose information length to be transmitted is greater than a length n of an information time block that can be carried by the time-frequency block, the terminal divides the information of the channel into two parts of n and m bits, and uses the n-bit part as information carried in the physical resource, and according to The m-bit portion is selected for interleaving or scrambling, according to the selected interlace Or the scrambling method interleaves or scrambles the n-bit portion after orthogonal code mapping, and performs channel scrambling on the interleaved or scrambled signal by using the channel scrambling code, thereby ensuring that when the control signaling is long, The embodiments of the present invention can be applied, and the scope of application of the embodiments of the present invention is expanded.

Although the invention has been illustrated and described with reference to the preferred embodiments of the present invention, it will be understood The spirit and scope of the invention.

Claims

Rights request

A reverse signal transmission method in an orthogonal frequency division multiplexing system, comprising the steps of:

Perform orthogonal code mapping on the information frame to be sent;

The sequence scrambled by the cell scrambling code is transmitted in the frequency domain by orthogonal frequency division multiplexing (OFDM).

The method for transmitting a reverse signal in an Orthogonal Frequency Division Multiplexing (OFDM) system according to claim 1, wherein the method further comprises: after performing orthogonal code mapping and scrambling the cell scrambling code, the method further comprises:

The sequences obtained by orthogonal code mapping are respectively scrambled by the channel scrambling code of the channel on which they are located; the sequences scrambled by the channel scrambling codes are combined, and the combined sequence is used as a sequence scrambled by the cell scrambling code.

3. The reverse signal transmission method in an Orthogonal Frequency Division Multiplexing system according to claim 2, wherein the sequence in which the channels are combined includes a pilot signal scrambled by a channel scrambling code.

The method for transmitting reverse signals in an Orthogonal Frequency Division Multiplexing (OFDM) system according to claim 1, wherein the method further comprises the step of: transmitting the sequence obtained by mapping the orthogonal codes in an OFDM manner. Interweaving before.

The method for transmitting a reverse signal in an Orthogonal Frequency Division Multiplexing (OFDM) system according to any one of claims 1 to 4, wherein the transmitting the sequence scrambled by the cell scrambling code in the OFDM manner in the frequency domain comprises: The sequence scrambled by the cell scrambling code is carried in an OFDM manner in a time-frequency block; the time-frequency block is composed of consecutive subcarriers and consecutive OFDM symbols in a physical channel resource of one physical frame, the one physical The physical channel resources of a frame include one or more time-frequency blocks.

The method for transmitting a reverse signal in an Orthogonal Frequency Division Multiplexing (OFDM) system according to claim 5, wherein when the physical channel resource of one physical frame includes more than one time-frequency block, the method further includes: The media access layer identification number MAC-ID, the terminal identification number, the time change, or a random selection of the time-frequency block carrying the sequence of the cell scrambling.

The method for transmitting an inverse signal in an Orthogonal Frequency Division Multiplexing (OFDM) system according to claim 5, wherein the time-frequency block is composed of consecutive subcarriers and all OFDMs of physical channel resources of one physical frame. Symbol composition.

8. The method for transmitting reverse signals in an orthogonal frequency division multiplexing system according to claim 5, wherein The information that the length of the information frame to be transmitted exceeds the length of the information frame that can be carried by the time-frequency block, and the orthogonal code mapping further includes:

Splitting the information frame to be sent into an n-bit portion and an m-bit portion;

Perform orthogonal code mapping on the n-bit portion;

The n-bit portion is interleaved or scrambled in an interleaving and scrambling manner corresponding to the m-bit portion.

9. A reverse signal receiving method in an Orthogonal Frequency Division Multiplexing system, comprising the steps of:

Receiving an OFDM signal from a frequency domain to obtain a received sequence;

Decoding the received sequence with a cell scrambling code;

The transmitted information frame is solved according to the sequence descrambled by the cell scrambling code and all candidate orthogonal codes.

10. The reverse signal receiving method in an OFDM system according to claim 9, wherein the decoding of the transmitted information frame according to the sequence descrambled by the cell scrambling code and all candidate orthogonal codes Includes:

The sequence descrambled by the cell scrambling code is descrambled again by the channel scrambling code of the channel on which the channel is scrambled; the sequence descrambled again by the channel scrambling code is correlated with all candidate orthogonal codes;

Find the candidate orthogonal code with the largest correlation peak, and the corresponding information frame is the transmitted information frame.

The method for receiving an inverted signal in an Orthogonal Frequency Division Multiplexing (OFDM) system according to claim 10, wherein the orthogonal frequency division multiplexing system includes two or more receiving antennas;

The method further includes: correspondingly adding a sequence of descrambling again by each channel scrambling code to a correlation result of all candidate orthogonal codes, and performing a search for a maximum correlation peak by the addition result; each of the channel interferences The sequence of code descrambling again comes from the OFDM signal of one receive antenna.

12. The method for receiving an inverted signal in an Orthogonal Frequency Division Multiplexing (OFDM) system according to claim 10, wherein the method further comprises: de-interleaving a sequence before correlation with all candidate orthogonal codes.

The method for receiving an inverted signal in an OFDM system according to any one of claims 9 to 12, wherein the receiving an OFDM signal from the frequency domain comprises: corresponding to a signal transmitting end The OFDM signal is received on a time-frequency block; the time-frequency block is composed of consecutive sub-carriers and consecutive OFDM symbols in a physical channel resource of one physical frame.

The method for receiving a reverse signal in an Orthogonal Frequency Division Multiplexing (OFDM) system according to claim 13, wherein the physical channel resource of the one physical frame includes at least two of the time-frequency blocks.

The method for receiving an inverted signal in an Orthogonal Frequency Division Multiplexing (OFDM) system according to claim 13, wherein the length of the transmitted information frame exceeds a channel of information length n bits that can be carried by a time-frequency block, The decoding of the transmitted information frame according to the sequence descrambled by the cell scrambling code and all candidate orthogonal codes includes:

The sequence descrambled by the cell scrambling code is descrambled again by the channel scrambling code of the channel on which the channel is scrambled; and the sequence descrambled by the channel scrambling code is solved according to the possible interleaving manner or scrambling mode of the reverse signal transmitting end Interweave or descramble;

The deinterleaved or descrambled sequence is correlated with all candidate orthogonal codes respectively; the transmitted information frame is obtained according to the candidate orthogonal code having the largest correlation peak and its corresponding interleaving or scrambling manner.

An apparatus for receiving an inverted signal in an OFDM system, comprising: a receiving module, configured to receive an OFDM signal from a frequency domain;

The reverse signal receiving apparatus in the OFDM system according to claim 16, further comprising:

a first descrambling module, configured to descramble the signal with a channel scrambling code and output the signal;

a deinterleaving module, configured to deinterleave the signal;

The second descrambling module performs descrambling on the received OFDM signal by using a cell scrambling code, and the deinterleaving module deinterleaves the signal output by the second descrambling module, the first descrambling module De-scrambling the signal output by the de-interleaving module by channel scrambling; or

The deinterleaving module performs deinterleaving on the received OFDM signal, and the second descrambling module descrambles the signal output by the deinterleaving module by using a cell scrambling code, and the first descrambling module uses a channel. The scrambling code re-disturbs the signal output by the second descrambling module;

The decorrelation module correlates the signal output by the first descrambling module with each candidate orthogonal code to solve an information frame sent by the terminal.

18. The reverse signal receiving apparatus in an orthogonal frequency division multiplexing system according to claim 16, further comprising a merging module for combining signals;

The receiving module receives the OFDM signal from the frequency domain by using at least two antennas, and after performing deinterleaving by the deinterleaving module respectively, the deinterleaved module is orthogonal to each candidate by the decorrelation module. The code is output after correlation;

The merging module combines the received signals received from the antennas and the correlated signals output by the decorrelation module to extract the information frames sent by the terminal.

19. A method for transmitting a reverse signal in an Orthogonal Frequency Division Multiplexing system, comprising the steps of:

The method for transmitting a reverse signal in an Orthogonal Frequency Division Multiplexing (OFDM) system according to claim 19, wherein the terminal selects the time-frequency block carrying a signal of the terminal according to the media access layer identification number; Or,

The terminal selects the time-frequency block that carries the signal of the local terminal according to the identifier of the terminal; or the terminal randomly selects the time-frequency block that carries the signal of the terminal.

The reverse signal transmitting method in an orthogonal frequency division multiplexing system according to claim 19, wherein the terminal selects the corresponding time-frequency block according to a change in time.

The method for transmitting a reverse signal in an Orthogonal Frequency Division Multiplexing (OFDM) system according to any one of claims 19 to 21, wherein the terminal maps the to-be-transmitted signal into an orthogonal code and performs interleaving, and The interleaved signal is carried in one of the time-frequency blocks and transmitted in OFDM mode.

23. The method of transmitting reverse signals in an Orthogonal Frequency Division Multiplexing system according to claim 22, further comprising the steps of:

Transmitting, by the channel scrambling code, signals that belong to different channels and mapping to orthogonal codes, respectively, and combining the scrambled control channel signals;

The terminal first interleaves the combined signals, and then re-scrambles the interleaved signal by using the cell scrambling code, and carries the re-scrambled signal in one of the time-frequency blocks in an OFDM manner. Transmitting; or, the terminal first re-scrambles the combined signal by using a cell scrambling code, and then interleaves the re-scrambled signal, and carries the interleaved signal in one time-frequency block. Take

OFDM mode transmission.

The method for transmitting reverse signals in an Orthogonal Frequency Division Multiplexing (OFDM) system according to claim 23, wherein the length of the information to be transmitted is greater than the length of the information length n that the time-frequency block can carry. The terminal divides the information of the channel into two parts, n and m bits, and uses the n-bit part as the information carried in the physical resource, and selects the interleaving or scrambling mode according to the m-bit part, according to the selected interleaving or scrambling mode. The n-bit portion after orthogonal code mapping is interleaved or scrambled, and the interleaved or scrambled signal is scrambled by the channel scrambling code.

25. A reverse signal receiving method in an orthogonal frequency division multiplexing system, comprising the steps of:

26. The reverse signal receiving method in an Orthogonal Frequency Division Multiplexing system according to claim 25, further comprising the steps of:

The network side deinterleaves the received signal, and then correlates the deinterleaved signal with each candidate orthogonal code to solve the information frame sent by the terminal.

27. The reverse signal receiving method in an Orthogonal Frequency Division Multiplexing system according to claim 26, further comprising the steps of:

The network side first descrambles the received OFDM signal by using a cell scrambling code, deinterleaves the descrambled signal, and descrambles the deinterleaved signal again by using the channel scrambling code; or The network side first deinterleaves the received OFDM signal, and then descrambles the deinterleaved signal by using the cell scrambling code, and performs descrambling again on the descrambled signal by using the channel scrambling code;

The network side correlates the descrambled signal with each candidate orthogonal code to solve the information frame sent by the terminal.

The reverse signal receiving method in an Orthogonal Frequency Division Multiplexing (OFDM) system according to claim 27, wherein a length of information required to be transmitted is greater than a length of information that can be carried by the time-frequency block a channel of n, the network side deinterleaves or descrambles the channel descrambled signal of the channel according to all possible interleaving or scrambling modes of the terminal, and deinterleaves or descrambles the sequence Correlating with each candidate orthogonal code respectively, obtaining part of the channel to be transmitted according to the obtained optimal signal sequence, and obtaining the remaining part of the channel to be transmitted according to the interleaving or scrambling method corresponding to the optimal signal sequence information.

29. A terminal device, comprising:

a transmitting module, configured to carry the signal mapped by the mapping module in a time-frequency block composed of consecutive subcarriers and all OFDM symbols in one physical frame, and send the same in an OFDM manner; The physical channel resources in one physical frame are divided in advance, and the physical channel resources are divided into at least two time-frequency blocks.

The terminal device according to claim 29, further comprising:

An interleaving module, configured to perform interleaving and outputting signals mapped to orthogonal codes;

The sending module carries the signal output by the interleaving module in the time-frequency block and transmits the signal in an OFDM manner.

The terminal device according to claim 30, further comprising:

a first scrambling module, configured to perform scrambling on signals that belong to different channels and are orthogonal codes after channel scrambling, and output the signals;

The merging module is configured to combine the signals output by the first scrambling module and output the second scrambling module, and the second scrambling module is configured to perform signal scrambling on the signal by the cell scrambling code to output the signal;

The interleaving module interleaves the signal output by the merging module, the second scrambling module re-scrambles the signal output by the interleaving module, and the transmitting module outputs the signal output by the second scrambling module The bearer is transmitted in an OFDM manner in one of the time-frequency blocks; or

The second scrambling module re-scrambles the signal output by the merging module, the interleaving module interleaves the signal output by the second scrambling module, and the sending module outputs the signal output by the interleaving module The bearer is transmitted in an OFDM manner in one of the time-frequency blocks.

32. An inverse signal receiving apparatus in an Orthogonal Frequency Division Multiplexing system, comprising: a receiving module, configured to use a time-frequency block consisting of consecutive subcarriers and all OFDM symbols in one physical frame Receiving an OFDM signal; and a de-correlation module, configured to correlate an OFDM signal received by the receiving module with each candidate orthogonal code, and decode an information frame sent by the terminal;

The reverse signal receiving device in the orthogonal frequency division multiplexing system according to claim 32, further comprising:

a deinterleaving module, configured to deinterleave the received signal and output the signal;

The decorrelation module correlates the deinterleaved signal with each candidate orthogonal code to solve an information frame sent by the terminal.

The reverse signal receiving device in the OFDM system of claim 33, further comprising:

a second descrambling module, configured to descramble the signal with a cell scrambling code and output the signal;

The second descrambling module descrambles the received OFDM signal by using a cell scrambling code, and the deinterleaving module deinterleaves the signal output by the second descrambling module, the first descrambling The module performs descrambling on the signal output by the deinterleaving module by channel scrambling; or

35. An apparatus for transmitting an inverse signal in an Orthogonal Frequency Division Multiplexing system, comprising: a mapping module, configured to perform orthogonal code mapping on a message frame to be sent;

a second scrambling module, configured to perform scrambling on the sequence obtained by mapping the orthogonal codes by using a cell scrambling code;

>5 and

And a sending module, configured to send the sequence scrambled by the second scrambling module in the frequency domain by using OFDM.

The apparatus for transmitting a reverse signal in an Orthogonal Frequency Division Multiplexing (OFDM) system according to claim 35, further comprising: a first scrambling module, configured to perform scrambling on signals that belong to different channels and are orthogonal codes after channel scrambling, and output the signals;

a merging module, configured to combine the signals output by the first scrambling module and output the signal; the interleaving module is configured to interleave the signals mapped to the orthogonal codes;

The interleaving module interleaves the signal output by the merging module, the second scrambling module re-scrambles the signal output by the interleaving module, and the sending module omits the second scrambling module by using an OFDM method. The output signal is sent in the frequency domain; or,

The second scrambling module re-scrambles the signal output by the merging module, the interleaving module interleaves the signal output by the second scrambling module, and the transmitting module omits the interleaving module in an OFDM manner The output signal is sent in the frequency domain.

The apparatus for transmitting a reverse signal in an Orthogonal Frequency Division Multiplexing (OFDM) system according to claim 35, wherein the apparatus further comprises:

a first scrambling module, configured to perform scrambling on a signal obtained by orthogonal code mapping by using a channel scrambling code of a channel on which the channel is located;

The merging module is configured to combine the sequences scrambled by the channel scrambling code and output the sequence to the second scrambling module.

The apparatus for transmitting an inverse signal in an Orthogonal Frequency Division Multiplexing (OFDM) system according to claim 37, wherein the apparatus further includes an interleaving module serially connected between the mapping module and the transmitting module, and configured to The input sequence is interleaved and output.

The apparatus for transmitting an inverse signal in an orthogonal frequency division multiplexing system according to claim 35, 37 or 38, wherein the transmitting module comprises a time-frequency block transmitting sub-module for The sequence scrambled by the scrambling module is carried in an OFDM manner in a time-frequency block; the time-frequency block is composed of consecutive subcarriers and consecutive OFDM symbols in a physical channel resource of one physical frame.

The apparatus for transmitting the reverse signal in the orthogonal frequency division multiplexing system according to claim 39, wherein the physical channel resource of the one physical frame includes at least two time-frequency blocks;

The sending module further includes a time-frequency block selection sub-module, configured to: according to the media access layer identification number MAC-ID, the terminal identification number, the time change, or the random selection of the sequence of the sequence scrambled by the second scrambling module The frequency block, and notifies the selected time-frequency block of the time-frequency block transmission sub-module.

41. The apparatus for transmitting a reverse signal in an orthogonal frequency division multiplexing system according to claim 39, The mapping module includes an information frame splitting module, configured to split the to-be-transmitted information frame into n bits for a channel whose information frame length that needs to be transmitted exceeds one information time length n can be carried by the time-frequency block. The partial and m-bit portions perform orthogonal code mapping on the n-bit portion, and interleave or scramble the n-bit portion in an interleaving and scrambling manner corresponding to the m-bit portion, and then output from the mapping module.

The apparatus for transmitting a reverse signal in an orthogonal frequency division multiplexing system according to claim 35, wherein the transmitting device is a terminal device.

43. A reverse signal receiving apparatus in an Orthogonal Frequency Division Multiplexing system, comprising: a receiving module, configured to receive an OFDM signal from a frequency domain, to obtain a receiving sequence;

The reverse signal receiving apparatus in the OFDM system according to claim 43, wherein the apparatus further comprises a deinterleaving module connected in series between the receiving module and the information frame recovery module, Output after deinterleaving the input sequence.

The reverse signal receiving apparatus in the OFDM system according to claim 43, wherein the apparatus further comprises: a first descrambling module, connected in series with the second descrambling module and the information frame Between the recovery modules, the sequence descrambled by the second descrambling module is descrambled again by the channel scrambling code of the channel on which it is located.

The reverse signal receiving apparatus in the OFDM system according to claim 45, wherein the information frame recovery module comprises:

a correlation operation submodule, configured to correlate a sequence descrambled by the first descrambling module with all candidate orthogonal codes;

The maximum correlation peak sub-module is configured to find a candidate orthogonal code having the largest correlation peak according to the correlation result, and output its corresponding information frame.

47. The reverse signal receiving apparatus in an orthogonal frequency division multiplexing system according to claim 46, wherein the orthogonal frequency division multiplexing system comprises at least two receiving antennas;

The information frame recovery module further includes a merging sub-module for adding the correlation results of the groups output by the relevant operation sub-module one by one, and outputting the addition result to the maximum correlation peak sub-module; The OFDM signal received from a corresponding one of the receiving antennas.

The reverse signal receiving apparatus in the orthogonal frequency division multiplexing system according to any one of claims 43 to 45, wherein the receiving module comprises a time-frequency block receiving sub-module for transmitting from and to the signal The OFDM signal is received on the time-frequency block corresponding to the terminal; the time-frequency block is composed of consecutive subcarriers and consecutive OFDM symbols in the physical channel resource of one physical frame.

49. The reverse signal receiving apparatus in an Orthogonal Frequency Division Multiplexing (OFDM) system according to claim 48, wherein the information is longer than a time-frequency block capable of carrying a length of information, the information The frame recovery module includes:

a demapping submodule, configured to perform deinterleaving or descrambling the input sequence according to a possible interleaving manner or a scrambling manner of the reverse signal transmitting end;

a correlation operation submodule, configured to correlate each sequence output by the demapping submodule with all candidate orthogonal codes;

The maximum correlation peak sub-module is configured to find a candidate orthogonal code having the largest correlation peak according to the correlation result, and obtain the transmitted information frame according to the candidate orthogonal code having the largest correlation peak and the corresponding interleaving or scrambling manner.