CA2476061A1 - Data transmission with non-uniform distribution of data rates for a multiple-input multiple-output (mimo) system - Google Patents
Data transmission with non-uniform distribution of data rates for a multiple-input multiple-output (mimo) system Download PDFInfo
- Publication number
- CA2476061A1 CA2476061A1 CA002476061A CA2476061A CA2476061A1 CA 2476061 A1 CA2476061 A1 CA 2476061A1 CA 002476061 A CA002476061 A CA 002476061A CA 2476061 A CA2476061 A CA 2476061A CA 2476061 A1 CA2476061 A1 CA 2476061A1
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- Prior art keywords
- data
- snr
- determining
- data stream
- data rates
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 230000005540 biological transmission Effects 0.000 title claims abstract 11
- 238000009828 non-uniform distribution Methods 0.000 title 1
- 238000000034 method Methods 0.000 claims abstract 26
- 230000003595 spectral effect Effects 0.000 claims 2
Classifications
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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
- H04B7/0413—MIMO systems
- H04B7/0417—Feedback systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
- H04L1/0017—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
- H04L1/0631—Receiver arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
Abstract
Techniques to determine data rates for a number of data streams transmitted via a number of transmission channels (or transmit antennas) in a multi-channel (e.g., MIMO) communication system. In one method, the "required" SNR
for each data rate to be used is initially determined, with at least two data rates being unequal. The "effective" SNR for each data stream is also determined based on the received SNR and successive interference cancellation processing at the receiver to recover the data streams. The required SNR for each data stream is then compared against its effective SNR. The data rates are deemed to be supported if the required SNR for each data stream is less than or equal to its effective SNR. A number of sets of data rates may be evaluated, and the rate set associated with the minimum received SNR may be selected for use for the data streams.
for each data rate to be used is initially determined, with at least two data rates being unequal. The "effective" SNR for each data stream is also determined based on the received SNR and successive interference cancellation processing at the receiver to recover the data streams. The required SNR for each data stream is then compared against its effective SNR. The data rates are deemed to be supported if the required SNR for each data stream is less than or equal to its effective SNR. A number of sets of data rates may be evaluated, and the rate set associated with the minimum received SNR may be selected for use for the data streams.
Claims (31)
1. A method for determining data rates for a plurality of data streams to be transmitted via a plurality of transmission channels in a multi-channel communication system, comprising:
determining a required signal-to-noise-and-interference ratio (SNR) for each of a plurality of data rates to be used for the plurality of data streams, wherein at least two of the data rates are unequal;
determining an effective SNR for each of the plurality of data streams based in part on successive interference cancellation processing at a receiver to recover the plurality of data streams;
comparing the required SNR for each data stream against the effective SNR for the data stream; and determining whether or not the plurality of data rates are supported based on results of the comparing.
determining a required signal-to-noise-and-interference ratio (SNR) for each of a plurality of data rates to be used for the plurality of data streams, wherein at least two of the data rates are unequal;
determining an effective SNR for each of the plurality of data streams based in part on successive interference cancellation processing at a receiver to recover the plurality of data streams;
comparing the required SNR for each data stream against the effective SNR for the data stream; and determining whether or not the plurality of data rates are supported based on results of the comparing.
2. The method of claim 1, wherein the plurality of data streams are transmitted over a plurality of transmit antennas in a multiple-input multiple-output (MTMO) communication system.
3. The method of claim 2, wherein each data stream is transmitted over a respective transmit antenna, and wherein the effective SNR for each data stream is determined based on full transmit power being used for the data stream.
4. The method of claim 1, wherein the effective SNR for each data stream is further determined based on a received SNR indicative of an operating condition of the plurality of transmission channels.
5. The method of claim 4, wherein the received SNR is determined based on the required SNR for one of the plurality of data streams.
6. The method of claim 4, wherein the received SNR is specified for the communication system.
7. The method of claim 4, wherein the received SNR is estimated at the receiver.
8. The method of claim 4, wherein the successive interference cancellation processing recovers one data stream at each stage, and wherein the effective SNR for each recovered data stream is estimated as where SNR eff (k) is the effective SNR for the data stream recovered in stage k, SNR rx is the received SNR, N T is the number of transmit antennas used for data transmission, and N R is the number of receive antennas.
9. The method of claim 4, further comprising:
evaluating a plurality of sets of data rates; and selecting a rate set associated with a minimum received SNR for use for the plurality of data streams.
evaluating a plurality of sets of data rates; and selecting a rate set associated with a minimum received SNR for use for the plurality of data streams.
10. The method of claim 9, wherein the data rates in each rate set are selected to achieve a specified overall spectral efficiency.
11. The method of claim 1, wherein the required SNR for each data rate is determined based on a look-up table.
12. The method of claim 1, wherein the plurality of data rates are deemed to be supported if the required SNR for each data rate is less than or equal to the effective SNR for the data rate.
13. The method of claim 1, wherein the communication system implements orthogonal frequency division multiplexing (OFDM).
14. A method for determining data rates for a plurality of data streams to be transmitted over a plurality of transmit antennas in a multiple-input multiple-output (MIMO) communication system, comprising:
determining an operating signal-to-noise-and-interference ratio (SNR) indicative of an operating condition of the MIMO system;
determining a required SNR for each of a plurality of data rates to be used for the plurality of data streams, wherein at least two of the data rates are unequal and wherein the plurality of data rates are selected to achieve a specified overall spectral efficiency;
determining an effective SNR for each of the plurality of data streams based on the operating SNR and successive interference cancellation processing technique at a receiver to recover the plurality of data streams;
comparing the required SNR for each data stream against the effective SNR for the data stream; and determining whether or not the plurality of data rates are supported based on results of the comparing.
determining an operating signal-to-noise-and-interference ratio (SNR) indicative of an operating condition of the MIMO system;
determining a required SNR for each of a plurality of data rates to be used for the plurality of data streams, wherein at least two of the data rates are unequal and wherein the plurality of data rates are selected to achieve a specified overall spectral efficiency;
determining an effective SNR for each of the plurality of data streams based on the operating SNR and successive interference cancellation processing technique at a receiver to recover the plurality of data streams;
comparing the required SNR for each data stream against the effective SNR for the data stream; and determining whether or not the plurality of data rates are supported based on results of the comparing.
15. A method for determining data rates for a plurality of data streams to be transmitted via a plurality of transmission channels in a multi-channel communication system, comprising:
determining a received SNR indicative of an operating condition of the plurality of transmission channels;
determining an effective SNR for each of the plurality of data streams based on the received SNR and successive interference cancellation processing at a receiver to recover the plurality of data streams; and determining a data rate for each data stream based on the effective SNR for the data stream, wherein at least two of the data rates are unequal.
determining a received SNR indicative of an operating condition of the plurality of transmission channels;
determining an effective SNR for each of the plurality of data streams based on the received SNR and successive interference cancellation processing at a receiver to recover the plurality of data streams; and determining a data rate for each data stream based on the effective SNR for the data stream, wherein at least two of the data rates are unequal.
16. The method of claim 15, wherein the data rate for each data stream is determined such that a required SNR for the data stream is less than or equal to the effective SNR for the data stream.
17. The method of claim 15, wherein the received SNR is specified for the communication system.
18. The method of claim 15, wherein each data stream is transmitted over a respective transmit antenna in a multiple-input multiple-output (MIMO) communication system.
19. A memory communicatively coupled to a digital signal processing device (DSPD) capable of interpreting digital information to:
determine a required signal-to-noise-and-interference ratio (SNR) for each of a plurality of data rates to be used for a plurality of data streams to be transmitted via a plurality of transmission channels in a multi-channel communication system, wherein at least two of the data rates are unequal;
determine an effective SNR for each of the plurality of data streams based in part on successive interference cancellation processing at a receiver to recover the plurality of data streams;
compare the required SNR for each data stream against the effective SNR for the data stream; and determine whether or not the plurality of data rates are supported based on results of the comparison.
determine a required signal-to-noise-and-interference ratio (SNR) for each of a plurality of data rates to be used for a plurality of data streams to be transmitted via a plurality of transmission channels in a multi-channel communication system, wherein at least two of the data rates are unequal;
determine an effective SNR for each of the plurality of data streams based in part on successive interference cancellation processing at a receiver to recover the plurality of data streams;
compare the required SNR for each data stream against the effective SNR for the data stream; and determine whether or not the plurality of data rates are supported based on results of the comparison.
20. An apparatus in a multi-channel communication system, comprising:
means for determining a required signal-to-noise-and-interference ratio (SNR) for each of a plurality of data rates to be used for a plurality of data streams to be transmitted via a plurality of transmission channels, wherein at least two of the data rates are unequal;
means for determining an effective SNR for each of the plurality of data streams based in part on successive interference cancellation processing at a receiver to recover the plurality of data streams;
means for comparing the required SNR for each data stream against the effective SNR for the data stream; and means for determining whether or not the plurality of data rates are supported based on results of the comparing.
means for determining a required signal-to-noise-and-interference ratio (SNR) for each of a plurality of data rates to be used for a plurality of data streams to be transmitted via a plurality of transmission channels, wherein at least two of the data rates are unequal;
means for determining an effective SNR for each of the plurality of data streams based in part on successive interference cancellation processing at a receiver to recover the plurality of data streams;
means for comparing the required SNR for each data stream against the effective SNR for the data stream; and means for determining whether or not the plurality of data rates are supported based on results of the comparing.
21. The apparatus of claim 20, further comprising:
means for evaluating a plurality of sets of data rates; and means for selecting a rate set associated with a minimum received SNR for use for the plurality of data streams.
means for evaluating a plurality of sets of data rates; and means for selecting a rate set associated with a minimum received SNR for use for the plurality of data streams.
22. The apparatus of claim 20, wherein the multi-channel communication system is a multiple-input multiple-output (MIMO) communication system.
23. The apparatus of claim 22, wherein the MIMO system implements orthogonal frequency division multiplexing (OFDM).
24. A base station comprising the apparatus of claim 20.
25. A wireless terminal comprising the apparatus of claim 20.
26. A transmitter unit in a multiple-input multiple-output (MIMO) communication system, comprising:
a controller operative to determine a plurality of data rates for a plurality of data streams to be transmitted over a plurality of transmit antennas by determining a required signal-to-noise-and-interference ratio (SNR), for each of the plurality of data rates, wherein at least two of the data rates are unequal, determining an effective SNR for each of the plurality of data streams based in part on successive interference cancellation processing technique at a receiver to recover the plurality of data streams, comparing the required SNR for each data stream against the effective SNR for the data stream, and determining whether or not the plurality of data rates are supported based on results of the comparing;
a transmit (TX) data processor operative to process each data stream with the determined data rate to provide a respective symbol stream; and one or more transmitters operative to process a plurality of symbol streams for the plurality of data streams to provide a plurality of modulated signals suitable for transmission over the plurality of transmit antennas.
a controller operative to determine a plurality of data rates for a plurality of data streams to be transmitted over a plurality of transmit antennas by determining a required signal-to-noise-and-interference ratio (SNR), for each of the plurality of data rates, wherein at least two of the data rates are unequal, determining an effective SNR for each of the plurality of data streams based in part on successive interference cancellation processing technique at a receiver to recover the plurality of data streams, comparing the required SNR for each data stream against the effective SNR for the data stream, and determining whether or not the plurality of data rates are supported based on results of the comparing;
a transmit (TX) data processor operative to process each data stream with the determined data rate to provide a respective symbol stream; and one or more transmitters operative to process a plurality of symbol streams for the plurality of data streams to provide a plurality of modulated signals suitable for transmission over the plurality of transmit antennas.
27. The transmitter unit of claim 26, wherein the controller is further operative to determine the data rates for the plurality of data streams by evaluating a plurality of sets of data rates, and selecting a rate set associated with a minimum received SNR.
28. A base station comprising the transmitter unit of claim 26.
29. A wireless terminal comprising the transmitter unit of claim 26.
30. A transmitter apparatus in a multiple-input multiple-output (MIMO) communication system, comprising:
means for determining a required signal-to-noise-and-interference ratio (SNR) for each of a plurality of data rates to be used for a plurality of data streams to be transmitted over a plurality of transmit antennas in the MIMO system, wherein at least two of the data rates are unequal;
means for determining an effective SNR for each of the plurality of data streams based in part on successive interference cancellation processing at a receiver to recover the plurality of data streams;
means for comparing the required SNR for each data stream against the effective SNR for the data stream;
means for determining whether or not the plurality of data rates are supported based on results of the comparison;
means for processing each data stream to provide a respective symbol stream;
and means for processing a plurality of symbol streams for the plurality of data streams to provide a plurality of modulated signals suitable for transmission over the plurality of transmit antennas.
means for determining a required signal-to-noise-and-interference ratio (SNR) for each of a plurality of data rates to be used for a plurality of data streams to be transmitted over a plurality of transmit antennas in the MIMO system, wherein at least two of the data rates are unequal;
means for determining an effective SNR for each of the plurality of data streams based in part on successive interference cancellation processing at a receiver to recover the plurality of data streams;
means for comparing the required SNR for each data stream against the effective SNR for the data stream;
means for determining whether or not the plurality of data rates are supported based on results of the comparison;
means for processing each data stream to provide a respective symbol stream;
and means for processing a plurality of symbol streams for the plurality of data streams to provide a plurality of modulated signals suitable for transmission over the plurality of transmit antennas.
31. A receiver unit in a multiple-input multiple-output (MIMO) communication system, comprising:
a receive (RX) MIMO processor operative to receive and process a plurality of received symbol streams using successive interference cancellation processing to provide a plurality of detected symbol streams for a plurality of transmitted data streams, one detected data stream for each stage of the successive interference cancellation processing; and a RX data processor operative to process each detected symbol stream to provide a corresponding decoded data stream, and wherein data rates for the plurality of transmitted data streams are determined by determining a received signal-to-noise-and-interference ratio (SNR) indicative of an operating condition of the communication system, determining an effective SNR
for each of the plurality of data streams based on the received SNR and the successive interference cancellation processing, and determining the data rate for each data stream based on the effective SNR, and wherein at least two of the data rates are unequal.
a receive (RX) MIMO processor operative to receive and process a plurality of received symbol streams using successive interference cancellation processing to provide a plurality of detected symbol streams for a plurality of transmitted data streams, one detected data stream for each stage of the successive interference cancellation processing; and a RX data processor operative to process each detected symbol stream to provide a corresponding decoded data stream, and wherein data rates for the plurality of transmitted data streams are determined by determining a received signal-to-noise-and-interference ratio (SNR) indicative of an operating condition of the communication system, determining an effective SNR
for each of the plurality of data streams based on the received SNR and the successive interference cancellation processing, and determining the data rate for each data stream based on the effective SNR, and wherein at least two of the data rates are unequal.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/087,503 US6636568B2 (en) | 2002-03-01 | 2002-03-01 | Data transmission with non-uniform distribution of data rates for a multiple-input multiple-output (MIMO) system |
US10/087,503 | 2002-03-01 | ||
PCT/US2003/006326 WO2003075479A1 (en) | 2002-03-01 | 2003-02-27 | Data transmission with non-uniform distribution of data rates for a multiple-input multiple-output (mimo) system |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2476061A1 true CA2476061A1 (en) | 2003-09-12 |
CA2476061C CA2476061C (en) | 2010-07-27 |
Family
ID=27787546
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA2476061A Expired - Fee Related CA2476061C (en) | 2002-03-01 | 2003-02-27 | Data transmission with non-uniform distribution of data rates for a multiple-input multiple-output (mimo) system |
Country Status (18)
Country | Link |
---|---|
US (2) | US6636568B2 (en) |
EP (2) | EP1786134B8 (en) |
JP (2) | JP2005519520A (en) |
KR (1) | KR100945596B1 (en) |
CN (1) | CN1639996B (en) |
AR (1) | AR038710A1 (en) |
AT (2) | ATE394844T1 (en) |
AU (1) | AU2003216479C1 (en) |
BR (1) | BR0308087A (en) |
CA (1) | CA2476061C (en) |
DE (2) | DE60326182D1 (en) |
IL (1) | IL163252A (en) |
MX (1) | MXPA04008473A (en) |
MY (1) | MY140343A (en) |
TW (1) | TWI337487B (en) |
UA (1) | UA87807C2 (en) |
WO (1) | WO2003075479A1 (en) |
ZA (1) | ZA200406236B (en) |
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