Quantization of channel state information in multiple antenna systems

• US 10,320,453 B2
• Filed: 02/23/2015
• Issued: 06/11/2019
• Est. Priority Date: 05/26/2006
• Status: Active Grant

• Current Assignee: Quarterhill Inc. (f/k/a Wi-LAN Inc.)
• Original Assignee: Wi-LAN Inc.
• Inventors: Mielczarek, Bartosz, Krzymien, Witold A.
• Primary Examiner(s): Nguyen, Leon Viet Q
• Application Number:
  US14/628,570
• Publication Number:
  US 20150222337A1
• Time in Patent Office: 1,569 Days
• Field of Search: None
• CPC Class Codes: H04B 7/0434 using multiple eigenmodes
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/0478 Special codebook structures directed to feedback optimisation
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04B 7/0658 Feedback reduction
• CPC Class Codes: H04B 7/066 Combined feedback for a number of channels, e.g. over several subcarriers like in orthogonal frequency division multiplexing [OFDM]
• CPC Class Codes: H04L 1/0029 Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling power control H04W52/04
• CPC Class Codes: H04L 1/003 Adaptive formatting arrangements particular to signalling, e.g. variable amount of bits
• CPC Class Codes: H04L 1/0687 Full feedback
• CPC Class Codes: H04L 1/0693 Partial feedback, e.g. partial channel state information [CSI]
• CPC Class Codes: H04L 25/0204 of multiple channels

Abstract

A method of transmission over multiple wireless channels in a multiple antenna system includes storing channel modulation matrices at a transmitter; receiving quantized channel state information at the transmitter from plural receivers; selecting a transmission modulation matrix using the quantized channel state information from the stored channel modulation matrices; and transmitting over the multiple channels to the plural receivers using the selected transmission modulation matrix. In another embodiment, the method includes storing, at one or more receivers, indexes of modulation matrices generated by a capacity enhancing algorithm; upon a selected one of the one or more receivers receiving a transmission from the transmitter, the selected receiver selecting a modulation matrix from the stored modulation matrices that optimizes transmission between the transmitter and the selected receiver, the selected receiver sending an index representing the selected modulation matrix; and receiving the index at the transmitter from the selected receiver.

Claims

1. A method for wireless transmission from a multiple-antenna transmitter, the method comprising:

storing a codebook including pre-quantized channel vectors each having a length N, wherein N is a number of antennas at the transmitter; and

in a multi-user multiple input and multiple output (MIMO) mode;

receiving a plurality of indices, only one of the plurality of indices from each of a plurality of user devices, each user device comprising a receiver and at least one of the user devices comprising a plurality of antennas, wherein each index corresponds to one of the pre-quantized channel vectors;

determining at least one and no more than N vectors based on at least one and no more than N of the received indices and on pre-quantized channel vectors corresponding to the at least one and no more than N received indices; and

transmitting data to at least one and no more than N user devices of the plurality of user devices, using the determined vectors;

wherein N is greater than one.

2. The method of claim 1, further comprising:

setting a limitation on the plurality of receivers which limits the indices received from the plurality of receivers.

3. The method of claim 1, wherein the plurality of indices are each received as channel state information (CSI).

4. The method of claim 1, wherein the transmitting of data to up to N receivers comprises transmitting orthogonal frequency division multiplexed (OFDM) signals using subcarriers.

5. The method of claim 1, wherein the codebook is used for all transmit powers.

6. The method of claim 1, wherein the codebook further comprises pre-quantized channel matrices, the method further comprising, at the transmitter:

in a second MIMO mode;

receiving, from a receiver, a second index corresponding to one of the pre-quantized channel matrices;

determining a matrix based on at least the second index; and

transmitting second data to the receiver using the determined matrix.

7. The method of claim 6, wherein the second index is received as channel state information (CSI).

8. The method of claim 6, wherein the transmitting second data to the receiver comprises transmitting orthogonal frequency division multiplexed (OFDM) signals using subcarriers.

9. A multiple-antenna transmitter, comprising:

N antennas;

a memory which stores a codebook including pre-quantized channel vectors each having a length N;

the transmitter being operable to, in a multi-user multiple input and multiple output (MIMO) mode;

receive a plurality of indices, only one of the plurality of indices from each of a plurality of user devices, each user device comprising a receiver and at least one of the user devices comprising a plurality of antennas, wherein each index corresponds to one of the pre-quantized channel vectors;

determine at least one and no more than N vectors based on at least one and no more than N of the received indices and on pre-quantized channel vectors corresponding to the at least one and no more than N received indices; and

transmit data to at least one and no more than N user devices of the plurality of user devices, using the determined vectors;

wherein N is greater than one.

10. The transmitter of claim 9, further operable to set a limitation on the plurality of receivers which limits the indices received from the plurality of receivers.

11. The transmitter of claim 9, wherein the plurality of indices are each received as channel state information (CSI).

12. The transmitter of claim 9, wherein the transmitting of data to up to N receivers comprises transmitting orthogonal frequency division multiplexed (OFDM) signals using subcarriers.

13. The transmitter of claim 9, wherein the codebook is used for all transmit powers.

14. The transmitter of claim 9, wherein the codebook further comprises pre-quantized channel matrices, and wherein the transmitter is further operable to:

in a second MIMO mode;

receive, from a receiver, a second index corresponding to one of the pre-quantized channel matrices;

determine a matrix based on at least the second index; and

transmit second data to the receiver using the determined matrix.

15. The transmitter of claim 14, wherein the second index is received as channel state information (CSI).

16. The transmitter of claim 14, wherein the transmitting second data to the receiver comprises transmitting orthogonal frequency division multiplexed (OFDM) signals using subcarriers.

17. A non-transitory computer-readable medium comprising instructions stored thereon which when executed by a processor of a transmitter configure the transmitter to:

store a codebook including pre-quantized channel vectors each having a length N, wherein N is a number of antennas at the transmitter; and

in a multi-user multiple-input and multiple-output (MIMO) mode;

receive a plurality of indices, only one of the plurality of indices from each of a plurality of user devices, each user device comprising a receiver and at least one of the user devices comprising a plurality of antennas, wherein each index corresponds to one of the pre-quantized channel vectors;

determine at least one and no more than N vectors based on at least one and no more than N of the received indices and on pre-quantized channel vectors corresponding to the at least one and no more than N received indices; and

transmit data to at least one and no more than N user devices of the plurality of user devices, using the determined vectors;

wherein N is greater than one.

18. The computer-readable medium of claim 17, further comprising instructions stored thereon which when executed by a processor of a transmitter configure the transmitter to set a limitation on the plurality of receivers which limits the indices received from the plurality of receivers.

19. The computer-readable medium of claim 17, wherein the plurality of indices are each received as channel state information (CSI).

20. The computer-readable medium of claim 17, wherein the transmitting of data to up to N receivers comprises transmitting orthogonal frequency division multiplexed (OFDM) signals using subcarriers.

21. The computer-readable medium of claim 17, wherein the codebook is used for all transmit powers.

22. The computer-readable medium of claim 17, wherein the codebook further comprises pre-quantized channel matrices, the computer-readable medium further comprising instructions stored thereon which when executed by a processor of a transmitter configure the transmitter to:

in a second MIMO mode;

receive, from a receiver, a second index corresponding to one of the pre-quantized channel matrices;

determine a matrix based on at least the second index; and

transmit second data to the receiver using the determined matrix.

23. The computer-readable medium of claim 22, wherein the second index is received as channel state information (CSI).

24. The computer-readable medium of claim 22, wherein the transmitting second data to the receiver comprises transmitting orthogonal frequency division multiplexed (OFDM) signals using subcarriers.