Systems and methods for reducing uplink resources to provide channel performance feedback for adjustment of downlink MIMO channel data rates

• US 8,995,547 B2
• Filed: 03/11/2005
• Issued: 03/31/2015
• Est. Priority Date: 03/11/2005
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Kim, Byoung-Hoon
• Primary Examiner(s): Liu, Shuwang
• Assistant Examiner(s): Huang, David S
• Application Number:
  US11/078,470
• Publication Number:
  US 20060205357A1
• Time in Patent Office: 3,672 Days
• Field of Search: 375/260, 375/267, 375/295, 375/316, 455/69
• US Class Current: 375/267
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04L 1/0656 Cyclotomic systems, e.g. Bell Labs Layered Space-Time [BLAST]
• CPC Class Codes: H04L 1/0675 characterised by the signaling

Abstract

Systems and methods for improving the performance of a MIMO wireless communication system by reducing the amount of uplink resources that are needed to provide channel performance feedback for the adjustment of data rates on the downlink MIMO channels. In one embodiment, a method comprises encoding each of a set of data streams according to corresponding data rates, permuting the data streams on a set of MIMO channels according to a full permutation of combinations, transmitting the permuted data streams, receiving the permuted data streams, decoding and determining an SNR for each of the data streams, computing a condensed SNR metric for the set of data streams, providing the condensed metric as feedback, determining a set of individual SNR metrics for the data streams based on the condensed SNR metric, and adjusting the data rates at which the data streams are encoded based on the individual SNR metrics.

Claims

1. A method implemented in a multiple-input, multiple-output (MIMO) wireless communication system, comprising:

transmitting a plurality of data streams from a first station to a second station over a plurality of antennas, wherein blocks of data from each of the plurality of data streams are permuted by transmitting different blocks of data from each data stream over different ones of the plurality of antennas, wherein each data stream is encoded and modulated based on a data rate for the data stream prior to transmission;

inversely permuting the plurality of data streams at the second station;

determining a quality metric for each of the plurality of data streams at the second station based on the different blocks of data for each data stream being permuted and transmitted over different ones of the plurality of antennas;

determining a condensed quality metric at the second station based on the quality metric for each of the plurality of data streams; and

transmitting the condensed quality metric from the second station to the first station.

2. The method of claim 1, further comprising:

determining the data rate for each of the plurality of data streams based on the condensed quality metric; and

encoding and modulating in the first station each of the plurality of data streams according to the data rate for the data stream.

3. The method of claim 2, wherein the quality metric comprises a signal-to-noise ratio (SNR), wherein the condensed quality metric comprises a reference SNR value and a Δ

SNR value, and wherein the determining the data rate for each of the plurality of data streams comprises determining the data rate for each data stream based on the reference SNR value plus a multiple of the Δ

SNR value.

4. The method of claim 1, wherein the first station is a base station and the second station is a mobile station.

5. The method of claim 1, wherein the quality metric comprises a signal-to-noise ratio (SNR).

6. The method of claim 5, wherein the condensed quality metric comprises a reference SNR value and a Δ

SNR value.

7. The method of claim 1, further comprising demodulating and decoding the plurality of data streams at the second station.

8. The method of claim 7, wherein the plurality of data streams are demodulated and decoded at the second station using successive interference cancellation.

9. A method for multiple-input, multiple-output (MIMO) wireless communication comprising:

receiving a condensed quality metric for a plurality of data streams, the condensed quality metric based on a quality metric for each data stream of the plurality of data streams;

determining at least one data rate for each of the plurality of data streams based on the condensed quality metric;

encoding and modulating each of the plurality of data streams according to the determined data rate for the data steam; and

transmitting the plurality of data streams over a plurality of antennas from a first station to a second station, wherein blocks of data from each of the plurality of data streams are permuted by transmitting different blocks of data from each data stream over different ones of the plurality of antennas, wherein the at least one data rate is used for the plurality of data streams.

10. The method of claim 9, wherein the quality metric comprises a signal-to-noise ratio (SNR).

11. The method of claim 10, wherein the condensed quality metric comprises a reference SNR value and a Δ

SNR value.

12. The method of claim 11, wherein the determining the at least one data rate for the plurality of data streams based on the condensed quality metric comprises determining the data rate for each data stream based on the reference SNR value plus a multiple of the Δ

SNR value.

13. A method for multiple-input, multiple-output (MIMO) wireless communication comprising:

determining a quality metric for each of a plurality of data streams;

determining a condensed quality metric based on the quality metric for each of the plurality of data streams;

transmitting the condensed quality metric to a base station;

receiving the plurality of data streams transmitted over a plurality of antennas, wherein blocks of data from each of the plurality of data streams are permuted by transmitting different blocks of data from each data stream over different ones of the plurality of antennas, wherein at least one data rate for each of the plurality of data streams is determined based on the condensed quality metric, wherein each data stream is encoded and modulated based on the determined data rate for the data stream prior to transmission; and

inversely permuting the plurality of data streams.

14. The method of claim 13, wherein the quality metric comprises a signal-to-noise ratio (SNR).

15. The method of claim 14, wherein the condensed quality metric comprises a reference SNR value and a Δ

SNR value.

16. The method of claim 13, further comprising demodulating and decoding the plurality of data streams.

17. The method of claim 16, wherein the plurality of data streams are demodulated and decoded using successive interference cancellation.

18. A base station for a multiple-input, multiple-output (MIMO) wireless communication system comprising:

a processing subsystem; and

a transceiver subsystem having a plurality of transmit antennas and being coupled to the processing subsystem;

wherein the processing subsystem is configured to

receive a condensed quality metric for a plurality of data streams, the condensed quality metric based on a quality metric for each data stream of the plurality of data streams,

determine at least one data rate for each of the plurality of data streams based on the condensed quality metric,

encode and modulate each of the plurality of data streams according to the determined corresponding data rate for the data stream,

permute blocks of data from each of the plurality of data streams and control the transceiver subsystem to transmit different blocks of data from each data stream over different ones of a plurality of transmit antennas, wherein the at least one data rate is used for the plurality of data streams.

19. The base station of claim 18, wherein the quality metric comprises a signal-to-noise ratio (SNR).

20. The base station of claim 19, wherein the condensed quality metric comprises a reference SNR value and a Δ

SNR value.

21. The base station of claim 20, wherein the processing subsystem is configured to determine the data rate for each data stream by computing a corresponding SNR equal to the reference SNR value plus a multiple of the Δ

SNR value, and wherein successive ones of the plurality of data streams have successively higher SNRs.

22. A mobile station for a multiple-input, multiple-output (MIMO) wireless communication system comprising:

a processing subsystem; and

a transceiver subsystem having a plurality of receive antennas and being coupled to the processing subsystem;

wherein the processing subsystem is configured to

determine a quality metric for each of a plurality of data streams,

determine a condensed quality metric based on the quality metric for each of the plurality of data streams,

send the condensed quality metric to a base station,

receive, via the plurality of receive antennas, the plurality of data streams transmitted over a plurality of transmit antennas and permuted by transmitting different blocks of data from each data stream over different ones of the plurality of transmit antennas, wherein at least one data rate for each of the plurality of data streams is determined based on the condensed quality metric, wherein each data stream is encoded and modulated based on the determined data rate for the data stream prior to transmission,

inversely permute the plurality of data streams,

decode and demodulate the plurality of data streams.

23. The mobile station of claim 22, wherein the quality metric comprises a signal-to-noise ratio (SNR).

24. The mobile station of claim 23, wherein the condensed quality metric comprises a reference SNR value and a Δ

SNR value.

25. The mobile station of claim 22, wherein the processing subsystem demodulates and decodes the plurality of data streams using successive interference cancellation.

26. A multiple-input, multiple-output (MIMO) wireless communication system, comprising:

means for transmitting a plurality of data streams from a first station to a second station over a plurality of antennas, wherein blocks of data from the plurality of data streams are permuted by transmitting different blocks of data from each data stream over different ones of the plurality of antennas, wherein each data stream is encoded and modulated based on a data rate for the data stream prior to transmission;

means for inversely permuting the plurality of data streams at the second station;

means for determining a quality metric for each of the plurality of data streams at the second station based on the different blocks of data for each data stream being permuted and transmitted over different ones of the plurality of antennas;

means for determining a condensed quality metric at the second station based on the quality metric for each of the plurality of data streams; and

means for transmitting the condensed quality metric from the second station to the first station.

27. The system of claim 26, further comprising:

means for determining the data rate for each of the plurality of data streams based on the condensed quality metric; and

means for encoding and modulating in the first station each of the plurality of data streams according to the data rate for the data stream.

28. The system of claim 27, wherein the quality metric comprises a signal-to-noise ratio (SNR), wherein the condensed quality metric comprises a reference SNR value and a Δ

SNR value, and wherein the means for determining the data rate for each of the plurality of data streams is configured to determine the data rate for each data stream based on the reference SNR value plus a multiple of the Δ

SNR value.

29. The system of claim 26, wherein the first station is a base station and the second station is a mobile station.

30. The system of claim 26, wherein the quality metric comprises a signal-to-noise ratio (SNR).

31. The system of claim 30, wherein the condensed quality metric comprises a reference SNR value and a Δ

SNR value.

32. The system of claim 26, further comprising means for demodulating and decoding the plurality of data streams at the second station.

33. The system of claim 32, wherein the means for demodulating and decoding the plurality of data streams is configured to demodulate and decode the plurality of data streams using successive interference cancellation.

34. An apparatus in a multiple-input, multiple-output (MIMO) wireless communication system, comprising:

means for receiving a condensed quality metric for a plurality of data streams, the condensed quality metric based on a quality metric for each data stream of the plurality of data streams;

means for determining at least one data rate for each of the plurality of data streams based on the condensed quality metric;

means for encoding and modulating each of the plurality of data streams according to the determined data rate for the data steam; and

means for transmitting the plurality of data streams over a plurality of antennas from a first station to a second station, wherein blocks of data from each of the plurality of data streams are permuted by transmitting different blocks of data from each data stream over different ones of the plurality of antennas, wherein the at least one data rate is used for the plurality of data streams.

35. An apparatus in a multiple-input, multiple-output (MIMO) wireless communication system, comprising:

means for determining a quality metric for each of a plurality of data streams;

means for determining a condensed quality metric based on the quality metric for each of the plurality of data streams;

means for transmitting the condensed quality metric to a base station;

means for receiving the plurality of data streams transmitted over a plurality of antennas, wherein blocks of data from each of the plurality of data streams permuted by transmitting different blocks of data from each data stream over different ones of the plurality of antennas, wherein at least one data rate for each of the plurality of data streams is determined based on the condensed quality metric, wherein each data stream is encoded and modulated based on the determined data rate for the data stream prior to transmission; and

means for inversely permuting the plurality of data streams.

36. A non-transitory computer-readable medium comprising instructions for a multiple-input, multiple-output (MIMO) wireless communication system, the instructions being executable to:

transmit a plurality of data streams from a first station to a second station over a plurality of antennas, wherein blocks of data from each the plurality of data streams are permuted by transmitting different blocks of data from each data stream over different ones of the plurality of antennas, wherein each data stream is encoded and modulated based on a data rate for the data stream prior to transmission;

inversely permute the plurality of data streams at the second station;

determine a quality metric for each of the plurality of data streams at the second station based on the different blocks of data for each data stream being permuted and transmitted over different ones of the plurality of antennas;

determine a condensed quality metric at the second station based on the quality metric for each of the plurality of data streams; and

transmit the condensed quality metric from the second station to the first station.

37. A non-transitory computer-readable medium comprising instructions for a multiple-input, multiple-output (MIMO) wireless communication system, the instructions being executable to:

receive a condensed quality metric for a plurality of data streams, the condensed quality metric based on a quality metric for each data stream of the plurality of data streams;

determine at least one data rate for each of the plurality of data streams based on the condensed quality metric;

encode and modulate each of the plurality of data streams according to the determined data rate for the data steam; and

transmit the plurality of data streams over a plurality of antennas from a first station to a second station, wherein blocks of data from each of the plurality of data streams permuted by transmitting different blocks of data from each data stream over different ones of the plurality of antennas, wherein the at least one data rate is used for the plurality of data streams.

38. A non-transitory computer-readable medium comprising instructions for a multiple-input, multiple-output (MIMO) wireless communication system, the instructions being executable to:

determine a quality metric for each of a plurality of data streams;

determine a condensed quality metric based on the quality metric for each of the plurality of data streams;

transmit the condensed quality metric to a base station;

receive the plurality of data streams transmitted over a plurality of antennas, wherein blocks of data from each of the plurality of data streams are permuted by transmitting different blocks of data from each data stream over different ones of the plurality of antennas, wherein at least one data rate for each of the plurality of data streams is determined based on the condensed quality metric, wherein each data stream is encoded and modulated based on the determined data rate for the data stream prior to transmission; and

inversely permute the plurality of data streams.