WO2006102639A1 - Systems and methods for beamforming feedback in multi antenna communication systems - Google Patents
Systems and methods for beamforming feedback in multi antenna communication systems Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0634—Antenna weights or vector/matrix coefficients
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0417—Feedback systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
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- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
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- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0636—Feedback format
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0636—Feedback format
- H04B7/0645—Variable feedback
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/0848—Joint weighting
- H04B7/0854—Joint weighting using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
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- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/0848—Joint weighting
- H04B7/0857—Joint weighting using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
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- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
Definitions
- the present document relates generally to wireless communication and amongst other things to eigen-beam forming for wireless communication systems.
- OFDM orthogonal frequency division multiplexing
- OFDM is a multi-carrier modulation technique that partitions the overall system bandwidth into multiple (N) orthogonal frequency subcarriers. These subcarriers may also be called tones, bins, and frequency channels. Each subcarrier is associated with a respective sub carrier that may be modulated with data. Up to N modulation symbols may be sent on the N total subcarriers in each OFDM symbol period. These modulation symbols are converted to the time-domain with an N-point inverse fast Fourier transform (IFFT) to generate a transformed symbol that contains N time-domain chips or samples.
- IFFT inverse fast Fourier transform
- frequency hopping In a frequency hopping communication system, data is transmitted on different frequency subcarriers during different time intervals, which may be referred to as "hop periods.” These frequency subcarriers may be provided by orthogonal frequency division multiplexing, other multi-carrier modulation techniques, or some other constructs. With frequency hopping, the data transmission hops from subcarrier to subcarrier in a pseudo-random manner. This hopping provides frequency diversity and allows the data transmission to better withstand deleterious path effects such as narrowband interference, jamming, fading, and so on.
- a problem that in most communication systems is that the receiver is located in a specific portion of an area served by the access point. In such cases, where a transmitter has multiple transmit antennas, the signals provided from each antenna need not be combined to provide maximum power at the receiver. In these cases, there may be problems with decoding of the signals received at the receiver.
- One way to deal with these problems is by utilizing beamforming.
- Beamforming is a spatial processing technique that improves the signal-to-noise ratio of a wireless link with multiple antennas. Typically, beamforming may be used at either the transmitter or the receiver in a multiple antenna system. Beamforming provides many advantages in improving signal-to-noise ratios which improves decoding of the signals by the receiver.
- FDD OFDMA frequency division duplexed
- the transmission from the access point to the access terminal and from the access terminal to the access point occupy different distinct frequency bands.
- feedback to perform beamforming generally requires knowledge of the channel at the transmitter, e.g. access point, which is not available without substantial feedback.
- This feedback generally in the form of the actual beamforming weights or vectors, requires a large amount of resources on control or signaling channels. This reduces data rates and increases the overhead required.
- available reverse link transmission resources allocated for transmission of beamforming information are determined based upon the determination of the available reverse link transmission resources. In some embodiments, this may be performed by a processor or other means. Further, in some embodiments this information is transmitted over the air as an instruction. [008] In certain embodiments, a determination whether to transmit eigenbeam information from the at least one antenna is based upon channel information. In some embodiments, the channel information may be channel statistics or second order channel statistics. In other embodiments, the channel information may be instantaneous channel information.
- FIG. 1 illustrates a multiple access wireless communication system according to an embodiment
- Fig. 2 illustrates a spectrum allocation scheme for a multiple access wireless communication system according to an embodiment
- FIG. 3 illustrates a conceptual block diagram of eigenbeams experienced by a receiver in a wireless communication system according to an embodiment
- FIG. 4 illustrates a transmitter and receiver in a multiple access wireless communication system an embodiment
- FIG. 5 illustrates a block diagram of a transmitter system in a multiple access wireless communication system according to an embodiment
- FIG. 6 illustrates a block diagram of a receiver system in a multiple access wireless communication system according to an embodiment
- Fig. 7 illustrates a flow chart of determining resources to be allocated for providing eigenbeam feedback according to an embodiment
- Fig. 8 illustrates a flow chart of determining whether to provide eigenbeam feedback according to another embodiment
- FIG. 9 illustrates a flow chart of generating eigenbeam vectors according to a further embodiment
- Fig. 10 illustrates a flow chart of generating eigenbeam feedback according an embodiment.
- a multiple access wireless communication system 100 includes multiple cells, e.g. cells 102, 104, and 106.
- each cell 102, 104, and 106 may include an access point 150 that includes multiple sectors.
- the multiple sectors may be formed by groups of antennas each responsible for communication with access terminals in a portion of the cell.
- antenna groups 112, 114, and 116 each correspond to a different sector.
- antenna groups 118, 120, and 122 each correspond to a different sector.
- antenna groups 124, 126, and 128 each correspond to a different sector.
- Each cell includes several access terminals which may be in communication with one or more sectors of each access point.
- access terminals 130 and 132 are in communication base station 142
- access terminals 134 and 136 are in communication with access point 144
- access terminals 138 and 140 are in communication with access point 146.
- each access terminal 130, 132, 134, 136, 138, and 140 is located in a different portion of it respective cell than each other access terminal in the same cell. Further, each access terminal may be a different distance from the corresponding antenna groups with which it is communicating. Both of these factors provide situations, also due to environmental and other conditions in the cell, to cause different channel conditions to be present between each access terminal and its corresponding antenna group with which it is communicating.
- an access point may be a fixed station used for communicating with the terminals and may also be referred to as, and include some or all the functionality of, a base station, a Node B, or some other terminology.
- An access terminal may also be referred to as, and include some or all the functionality of, a user equipment (UE), a wireless communication device, terminal, a mobile station or some other terminology.
- UE user equipment
- a spectrum allocation scheme for a multiple access wireless communication system is illustrated.
- a plurality of OFDM symbols 200 is allocated over T symbol periods and S frequency subcarriers.
- Each OFDM symbol 200 comprises one symbol period of the T symbol periods and a tone or frequency subcarrier of the S subcarriers.
- one or more symbols 200 may be assigned to a given access terminal.
- one or more hop regions e.g. hop region 202, of symbols to a group of access terminals for communication over a reverse link.
- assignment of symbols may be randomized to reduce potential interference and provide frequency diversity against deleterious path effects.
- Each hop region 202 includes symbols 204 that may be assigned to the one or more access terminals that are in communication with the sector of the access point and assigned to the hop region.
- the location of hop region 202 within the T symbol periods and S subcarriers varies according to a hopping sequence.
- the assignment of symbols 204 for the individual access terminals within hop region 202 may vary for each hop period.
- the hop sequence may pseudo-randomly, randomly, or according to a predetermined sequence, select the location of the hop region 202 for each hop period.
- the hop sequences for different sectors of the same access point may be designed to be orthogonal to one another to avoid "intra-cell" interference among the access terminal communicating with the same access point.
- hop sequences for each access point may be pseudo-random with respect to the hop sequences for nearby access points. This may help randomize "inter-cell" interference among the access terminals in communication with different access points.
- the frequency subbands 1 to S do not overlap with any of the subbands of 1 to S of the forward link.
- some of the symbols 204 of a hop region 202 may be assigned to pilot symbols that may be transmitted from the access terminals to the access point.
- the assignment of pilot symbols to the symbols 204 should, in an embodiment, support space division multiple access (SDMA), where signals of different access terminals overlapping on the same hop region can be separated due to multiple receive antennas at a sector or access point, provided enough difference of spatial signatures corresponding to different access terminals.
- SDMA space division multiple access
- Fig. 2 depicts hop region 200 having a length of seven symbol periods, the length of hop region 200 can be any desired amount, may vary in size between hop periods, or between different hopping regions in a given hop period.
- a transmitter 300 which may be an access point, transmit multiple symbols during a given hop period intended for receiver 304, which may be an access terminal.
- Signals transmitted from transmitter 300 are transmitted from antennas 302 a , 302 b , 302c, ..., 302 t and received by receiver 304 at antennas 306 a , 306 b , ..., 306 r .
- This forms a MIMO channel between transmitter 200 and receiver 304.
- transmitter 300 eigenbeamforms the symbols.
- Eigenbeamforming is a technique that combines beamforming, diversity and spatial multiplexing gains, using eigenvectors to multiply, phase shift, and/or amplitude shifts of symbols for transmission depending on the antenna from which they are to be transmitted.
- a transmitter 300 transmits pilot symbols from antennas 302 a , 302 b , 302c, ... , 302 t which are used by the receiver 304 to estimate the downlink channel and calculate its correlation matrix. Then, the receiver 304 performs eigenvalue decomposition of the correlation matrix and provides information regarding the eigenvectors to the transmitter 300. In some embodiments, the receiver 304 determines which of the eigenvector beam patterns would yield the highest signal-to-noise ratio (SNR) or other desired signal characteristics and transmits this information to the base station which may use this eigenvector information for beam shaping for data signal transmission to this mobile station on later transmissions.
- SNR signal-to-noise ratio
- the eigenbeams may have several (local) maxima 308 a , 308 b , and 308c pointing in different directions.
- Other eigenbeams may have portions 310 a , and 310 b that point in other directions but have a lower magnitude, as received at receiver 304, than eigenbeams having maxima 308 a , 308 b , and 308c.
- the radiation pattern and therefore those eigenbeams having the greatest maxima of can vary over time as the channel conditions, the location of the receiver, or other factors change.
- receiver 304 provides feedback information regarding the eigenvectors to transmitter 300.
- feedback is provided based upon the channel conditions. For example, in an embodiment, if channel conditions are substantially unchanging feedback may be provided. In other embodiments, if channel conditions have recently changed then feedback may be provided. In additional, embodiments, if channel conditions are constantly changing, no feedback or minimum feedback may be provided. In further embodiments, feedback may be provided if there is a recent change in the channel conditions or channel conditions are substantially unchanging. In some embodiments, changes in channel conditions may be determined by changes in channel statistics, instantaneous channel information or signal-to-noise ratios.
- the feedback may comprise eigenvectors calculated at the receiver 304 for the dominant eigenbeams experienced by the receiver 304.
- the information regarding the eigenvectors for the dominant eigenbeams is quantized according to a codebook and then the quantized bits are transmitted to the transmitter 302 that includes a codebook for reading the quantized bits.
- the quantized bits are based on the minimum mean square error between the codebook and the dominant eigenbeams, or the dominant beams and the other eigenbeams..
- the feedback provided by the access terminal is utilized to form a preliminary beamforming matrix comprising a plurality of eigenvectors that have been feedback from the receiver to the transmitter. Due to limited reverse link resources, this preliminary beamforming matrix may not comprise of all the eigenvectors necessary for transmission.
- B is the "preliminar y" beamformin g matrix.
- V is the "final” beamformin g matrix consisting of the complete set of eigenvecto rs.
- V [V 1 v 2 .. v k v k+1 v M ] v k+ i •• ⁇ V M ⁇ me pseudo - eigenvecto rs that have been generated from the QR decomposit ion
- the individual scalars of the beamform vectors represent the beamforming weights that are applied to the symbols transmitted from the M T antennas to each access terminal. These vectors then are formed by the following:
- the eigenbeam feedback e.g. a 7-bit or other sized feedback may include rank information, may be computed based on from the broadband pilots and reported along with the eigenbeam information.
- the control or signaling channel information transmitted from the access terminal, after being decoded, may act as a broadband pilot for the reverse link.
- TX data processor 414 formats, codes, and interleaves the traffic data for each data stream based on a particular coding scheme selected for that data stream to provide coded data.
- TX data processor 414 applies beamforming weights to the symbols of the data streams based upon the user to which the symbols are being transmitted.
- the beamforming weights may be generated based upon eigenbeam vectors generated at the receiver 402 and provided as feedback to the transmitter 400. Further, in those cases of scheduled transmissions, the TX data processor 414 can select the packet format based upon rank information that is transmitted from the user.
- the coded data for each data stream may be multiplexed with pilot data using OFDM techniques.
- the pilot data is typically a known data pattern that is processed in a known manner and may be used at the receiver system to estimate the channel response.
- the multiplexed pilot and coded data for each data stream is then modulated (i.e., symbol mapped) based on a particular modulation scheme (e.g., BPSK, QSPK, M-PSK, or M-QAM) selected for that data stream to provide modulation symbols.
- the data rate, coding, and modulation for each data stream may be determined by instructions performed on provided by processor 430.
- the packet format for one or more streams may be varied according to the rank information that is transmitted from the user.
- TX MIMO processor 420 may further process the modulation symbols (e.g., for OFDM).
- TX MIMO processor 420 then provides N T modulation symbol streams to N T transmitters (TMTR) 422a through 422t.
- TMTR T transmitters
- TX MEMO processor 420 applies beamforming weights to the symbols of the data streams based upon the user to which the symbols are being transmitted and the antenna from which the symbol is being transmitted from that users channel response information.
- Each transmitter 422 receives and processes a respective symbol stream to provide one or more analog signals, and further conditions (e.g., amplifies, filters, and upconverts) the analog signals to provide a modulated signal suitable for transmission over the MIMO channel.
- N T modulated signals from transmitters 422a through 422t are then transmitted from N T antennas 424a through 424t, respectively.
- the transmitted modulated signals are received by N R antennas 452a through 452r and the received signal from each antenna 452 is provided to a respective receiver (RCVR) 454.
- Each receiver 454 conditions (e.g., filters, amplifies, and downconverts) a respective received signal, digitizes the conditioned signal to provide samples, and further processes the samples to provide a corresponding "received" symbol stream.
- An RX data processor 460 then receives and processes the N R received symbol streams from N R receivers 454 based on a particular receiver processing technique to provide N T "detected" symbol streams.
- the processing by RX data processor 460 is described in further detail below.
- Each detected symbol stream includes symbols that are estimates of the modulation symbols transmitted for the corresponding data stream.
- RX data processor 460 then demodulates, deinterleaves, and decodes each detected symbol stream to recover the traffic data for the data stream.
- the processing by RX data processor 460 is complementary to that performed by TX MIMO processor 420 and TX data processor 414 at transmitter system 410.
- the channel response estimate generated by RX processor 460 may be used to perform space, space/time processing at the receiver, adjust power levels, change modulation rates or schemes, or other actions.
- RX processor 460 may further estimate the signal-to-noise-and-interference ratios (SNRs) of the detected symbol streams, and possibly other channel characteristics, and provides these quantities to a processor 470.
- SNRs signal-to-noise-and-interference ratios
- RX data processor 460 or processor 470 may further derive an estimate of the "operating" SNR for the system.
- Processor 470 then provides estimated channel state information (CSI), which may comprise various types of information regarding the communication link and/or the received data stream.
- the CSI may comprise only the operating SNR.
- the CSI is then processed by a TX data processor 438, which also receives traffic data for a number of data streams from a data source 476, modulated by a modulator 480, conditioned by transmitters 454a through 454r, and transmitted back to transmitter system 410.
- processor 470 may calculate the eigenbeams experienced by the receiver 402. The eigenbeams may be calculated as discussed with respect to Fig. 3. The processor 470 may then determine the dominant eigenbeams and feedback may only be provided for them. Processor 470 can quantize the dominant eigenbeams according to a codebook that is known are transmitter 400. In some embodiments, as described with respect to Fig. 3 five-bit codes may be utilized allowing a wide range of feedback. The codebook size can vary depending on the reverse link resources available for such feedback.
- processor 470 may calculate channel statistics and determine what the change was in the channel statistics between two or more consecutive transmissions to the receiver 402. Depending on the degree of change, a decision may be made as to whether to provide eigenbeam feedback. In additional embodiments, the processor may determine instantaneous channel information for a particular transmission and then determine a change between instantaneous channel information for one or more prior transmissions. This information may them be utilized to determine whether to provide eigenbeam feedback.
- the modulated signals from receiver system 450 are received by antennas 424, conditioned by receivers 422, demodulated by a demodulator 440, and processed by a RX data processor 442 to recover the CSI reported by the receiver system.
- the reported CSI is then provided to processor 430 and used to (1) determine the data rates and coding and modulation schemes to be used for the data streams and (2) generate various controls for TX data processor 414 and TX MIMO processor 420.
- receiver processing techniques may be used to process the N R received signals to detect the N T transmitted symbol streams.
- These receiver processing techniques may be grouped into two primary categories (i) spatial and space-time receiver processing techniques (which are also referred to as equalization techniques); and (ii) “successive nulling/equalization and interference cancellation” receiver processing technique (which is also referred to as “successive interference cancellation” or “successive cancellation” receiver processing technique).
- a MEVIO channel formed by the N T transmit and N R receive antennas may be decomposed into Ns independent channels, with N s ⁇ min ⁇ N ⁇ , N R ⁇ .
- Each of the Ns independent channels may also be referred to as a spatial subchannel (or a transmission channel) of the MEMO channel and corresponds to a dimension.
- an independent data stream may be transmitted from each of the N T transmit antennas.
- the transmitted data streams may experience different channel conditions (e.g., different fading and multipath effects) and may achieve different signal-to-noise-and-interference ratios (SNRs) for a given amount of transmit power.
- SNRs signal-to-noise-and-interference ratios
- successive interference cancellation processing is used at the receiver to recover the transmitted data streams, and then different SNRs may be achieved for the data streams depending on the specific order in which the data streams are recovered. Consequently, different data rates may be supported by different data streams, depending on their achieved SNRs. Since the channel conditions typically vary with time, the data rate supported by each data stream also varies with time.
- the MBVIO design may have two modes of operation, single code word (SCW) and multiple-code word (MCW).
- SCW single code word
- MCW multiple-code word
- the transmitter can encode the data transmitted on each spatial layer independently, possibly with different rates.
- the receiver employs a successive interference cancellation (SIC) algorithm which works as follows: decode the first layer, and then subtract its contribution from the received signal after re-encoding and multiplying the encoded first layer with an "estimated channel,” then decode the second layer and so on.
- SIC successive interference cancellation
- This "onion-peeling" approach means that each successively decoded layer sees increasing SNR and hence can support higher rates.
- MCW design with SIC achieves maximum system transmission capacity based upon the channel conditions.
- the transmitter encodes the data transmitted on each spatial layer with "identical data rates.”
- the receiver can employ a low complexity linear receiver such as a Minimum Mean Square Solution (MMSE) or Zero Frequency (ZF) receiver, or non-linear receivers such as QRM, for each tone. This allows reporting of the channel estimates by the receiver to be for only the "best" layer and reduced transmission overhead for providing this information.
- MMSE Minimum Mean Square Solution
- ZF Zero Frequency
- QRM non-linear receivers
- Fig. 4 and the associated discussion refers to a MBVIO system
- MISO multi-input single-input
- SEVIO single-output multi-input
- Transmitter 500 utilizes rate prediction block 502 which controls a single-input single-output (SISO) encoder 504 to generate an information stream.
- SISO single-input single-output
- Bits 506 are turbo-encoded by encoder block 506 and mapped to modulation symbols by mapping block 508 depending on the packet format (PF) 524, specified by a rate prediction block 502.
- the coded symbols are then de-multiplexed by a demultiplexer 510 to M layers 512, which are provided to a beamforming module 514.
- Beamforming module 514 generates an N T xM beamforming matrix.
- the matrix may be formed for each transmission on the reverse link. Each transmission may involve processes M layers and generate N 7 . streams.
- the eigen-beam weights may be generated from the eigenbeam feedback 524, e.g. quantized eigenvectors, transmitted by the access terminal to the access point. Further, as described above the feedback may comprise only the dominant eigenvectors experienced at the access terminal.
- the N ⁇ streams 512 after beamforming are provided to OFDM modulators 518a to 518t that interleave the output symbol streams with pilot symbols. The OFDM processing for each transmit antenna 520a to 52Ot then in an identical fashion, after which the signals are transmitted via a MTMO scheme.
- turbo encoder 506 encodes the data stream, and in an embodiment uses 1/5 encoding rate. It should be noted that other types of encoders and encoding rates may be utilized.
- Symbol encoder 508 maps the encoded data into the constellation symbols for transmission. In one embodiment, the constellations may be Quadrature-Amplitude constellations. While a SISO encoder is described herein, other encoder types including MBVIO encoders may be utilized.
- Rate prediction block 502 processes the CQI and/or channel estimate information, including rank information, which is received at the access point for each access terminal.
- the rank information may be provided based upon broadband pilot symbols, hop based pilot symbols, or both.
- the rank information is utilized to determine a modulation rate by rate prediction block 502.
- the rate prediction algorithm may use a 5-bit CQI feedback 522 approximately every 5 milliseconds and/or channel estimates. The actual number of bits of CQI feedback 22 may vary based upon design choices or parameters.
- the packet format e.g. modulation rate
- the packet format is determined using several techniques. Exemplary techniques are depicted and disclosed in co-pending U.S. Patent Application No. 11/021,791, entitled “Performance Based Rank Prediction for MMO Design," and U.S. Patent Application No. 11/022,347, entitled “Capacity Based Rank Prediction for MIMO Design,” both of which are incorporated herein by reference as if set forth in their entireties.
- each antenna 602a through 602t receives one or more symbols intended for the receiver 600.
- the antennas 602a through 602t are each coupled to OFDM demodulators 604a to 604t, each of which is coupled to hop buffer 606.
- the OFDM demodulators 704a to 604t each demodulate the OFDM received symbols into received symbol streams.
- Hop buffer 606 stores the received symbols for the hop region in which they were transmitted.
- hop buffer 606 The output of hop buffer 606 is provided to a decoder 608, which may be a decoder that independently processes each carrier frequency of the OFDM band. Both hop buffer 606 and the decoder 608 are coupled to a channel statistics processing 610 that also forms the eigenbeamweights that can be provided to the transmitter for future transmissions. In addition, channel statistics processing 610 determines channel statistics, second order channel statistics, instantaneous channel information, or signal- to-noise ratios for multiple transmissions. The channel statistics processing 610 can also determine whether changes have occurred and then transmit the eigenbeam feedback.
- receiver 600 may determine the available reverse link resources, [0066]
- the demodulated information streams are then provided to Log-Likelihood- Ratio block 612 and decoder 614, which may be a turbo decoder or other decoder to match the encoder used at the access point, that provide a decoded data stream for processing.
- a flow chart of determining resources to be allocated for providing eigenbeam feedback is illustrated.
- a determination is made as to the available reverse link resources, block 700.
- the resources may be the number of symbols that may be transmitted over a reverse link signaling or control channel, the available bandwidth, or other information. This determination may be made at an access point and provided to the access terminal or at the access terminal based upon fixed parameters or data rates for the next forward link transmission.
- the amount may be the total number of eigenbeams, the number of dominant eigenbeams, or a ranking of the eigenbeams. Further, the amount may include rank information or CQI information so that the amount takes into account all or most of the feedback required from the access terminal.
- An indicator as to the resources allocated for reverse link transmission is generated, block 704. The indicator may be generated at either the access point or access terminal and then transmitted to the access terminal. Resources on the reverse link are then allocated for transmission based upon the indicator, block 706. [0070] Referring to Fig.
- Channel information is generated, block 800.
- the channel information may be instantaneous channel information or channel statistics.
- the channel information may relate to the packet error rate, fading, signal strength, channel state information or other information.
- the channel information calculated in either, or both, the frequency and time domain may be utilized.
- second order channel statistics are utilized.
- first order or higher order channel statistics are utilized in addition to, or in lieu of, the second order channel statistics.
- the channel information may be calculated based upon pilot symbols or both pilot symbols and data symbols.
- the change in channel information is determined, block 802.
- the change may be between consecutive transmissions, between the current transmission and a transmission N transmissions prior to the current transmission, time averaged changes, averages over M transmissions, or other approaches.
- the changes may be calculated as the absolute value of the difference of the squares of the channel information for the current transmission and a transmission that is N transmissions prior to the current transmission.
- the dominant eigenbeams are determined, block 806.
- Information regarding the dominant eigenbeams is then transmitted to the access point, block 808.
- the information regarding the dominant eigenbeams may be quantized according to a codebook. Also, it should be noted that block 806 may occur at any time prior to block 804 and may be independent of the process depicted in Fig. 8. In the case where the channel is determined to be variable, no feedback is provided, block 810.
- the eigenbeam information provided from the terminal to the access point is read, block 900.
- the eigenbeam information may be quantized and therefore the appropriate information is read from a codebook for use at block 900. Further, the eigenbeam information may apply to only the dominant eigenbeams.
- the eigenbeam information is utilized to construct an eigenbeamforming matrix, block 902.
- the eigenbeamforming matrix is then decomposed, block 904.
- the decomposition may be a QR decomposition.
- the eigenvectors representing the beartiforming weights can then be generated for the symbols of the next hop region to be transmitted to the access terminal, block 906.
- a flow chart of generating eigenbeam feedback according an embodiment is illustrated.
- the forward link channel is estimated based upon received symbols, such as pilot symbols, block 1000.
- the dominant eigenbeams are then determined and calculated based upon the forward link channel estimate, block 1002.
- a determination is made as the amount of available forward link resources, block 1004.
- the resources may be the number of symbols that may be transmitted over a reverse link signaling or control channel, the available bandwidth, or other information. This determination may be made at an access point and provided to the access terminal or at the access terminal based upon fixed parameters or data rates for the next forward link transmission.
- a frequency average of the dominant eigenbeams are determined, prior to being provided as feedback to the access point, block 1006.
- the dominant eigenbeams for each required frequency are provided as feedback to the access point, block 1008.
- the techniques described herein may be implemented by various means. For example, these techniques may be implemented in hardware, software, or a combination thereof.
- the processing units within a access point or a access terminal may be implemented within one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, micro-controllers, microprocessors, other electronic units designed to perform the functions described herein, or a combination thereof.
- ASICs application specific integrated circuits
- DSPs digital signal processors
- DSPDs digital signal processing devices
- PLDs programmable logic devices
- FPGAs field programmable gate arrays
- processors controllers, micro-controllers, microprocessors, other electronic units designed to perform the functions described herein, or a combination thereof.
- the techniques described herein may be implemented with modules (e.g., procedures, functions, and so on) that perform the
Abstract
Description
Claims
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MX2007011700A MX2007011700A (en) | 2005-03-24 | 2006-03-24 | Systems and methods for beamforming feedback in multi antenna communication systems. |
CN2006800181867A CN101185259B (en) | 2005-03-24 | 2006-03-24 | Systems and methods for beamforming feedback in multi antenna communication systems |
BRPI0609438-4A BRPI0609438A2 (en) | 2005-03-24 | 2006-03-24 | systems and methods for beamforming feedback in multi-antenna communication systems |
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CA2602388A CA2602388C (en) | 2005-03-24 | 2006-03-24 | Systems and methods for beamforming feedback in multi antenna communication systems |
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IL186086A IL186086A0 (en) | 2005-03-24 | 2007-09-19 | Systems and methods for beamforming feedback in multi antenna communication systems |
NO20075362A NO20075362L (en) | 2005-03-24 | 2007-10-19 | Radiation feedback in multi-antenna communication system |
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AU2006226769B2 (en) | 2010-11-18 |
AR053702A1 (en) | 2007-05-16 |
KR101182976B1 (en) | 2012-09-18 |
KR20100035188A (en) | 2010-04-02 |
NZ579379A (en) | 2010-10-29 |
TW200703969A (en) | 2007-01-16 |
CN101185259B (en) | 2013-08-21 |
BRPI0609438A2 (en) | 2010-04-06 |
KR101033532B1 (en) | 2011-05-11 |
NZ561748A (en) | 2009-10-30 |
AU2006226769A1 (en) | 2006-09-28 |
CA2602388C (en) | 2014-02-04 |
MX2007011700A (en) | 2007-12-05 |
CA2737846A1 (en) | 2006-09-28 |
IL186086A0 (en) | 2008-01-20 |
US20060203708A1 (en) | 2006-09-14 |
CA2737846C (en) | 2015-04-07 |
EP1869799B1 (en) | 2014-12-24 |
KR20110050570A (en) | 2011-05-13 |
CA2602388A1 (en) | 2006-09-28 |
EP1869799A1 (en) | 2007-12-26 |
CN101185259A (en) | 2008-05-21 |
KR20070112421A (en) | 2007-11-23 |
TWI326165B (en) | 2010-06-11 |
US9154211B2 (en) | 2015-10-06 |
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