QUANTIZATION OF CHANNEL STATE INFORMATION IN MULTIPLE ANTENNA SYSTEMS

• US 20190326961A1
• Filed: 06/10/2019
• Published: 10/24/2019
• Est. Priority Date: 05/26/2006
• Status: Active Grant

• Current Assignee: Wi-LAN Inc.
• Original Assignee: Wi-LAN Inc.
• Inventors: Mielczarek, Bartosz, Krzymien, Witold A.
• Granted Patent: US 10,797,763 B2
• Time in Patent Office: Days
• 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 reception by a user device comprising a multiple-antenna receiver, 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 wherein N is greater than 1; and

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

transmitting one index corresponding to one of the pre-quantized channel vectors to the multiple-antenna transmitter;

receiving a signal from the multiple-antenna transmitter including data for at least two and no more than N user devices based on the transmitted index; and

recovering data from the received signal, the data transmitted using the pre-quantized vector corresponding to the index.

2. The method of claim 1, wherein the index is transmitted as channel state information (CSI).

3. The method of claim 1, wherein receiving the signal from the multiple-antenna transmitter comprises receiving orthogonal frequency division multiplexed (OFDM) signals using subcarriers.

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

5. The method of claim 1, wherein the codebook further comprises pre-quantized channel matrices, the method further comprising, in a second MIMO mode:

transmitting a second index corresponding to one of the pre-quantized channel matrices to the multiple-antenna transmitter; and

receiving a second signal from the multiple-antenna transmitter including second data for at least two and no more than N user devices based on the transmitted second index; and

recovering second data from the received signal, the data transmitted using the pre-quantized matrix corresponding to the second index.

6. The method of claim 5, wherein the second index is transmitted as channel state information (CSI).

7. The method of claim 5, wherein receiving the second signal from the multiple-antenna transmitter comprises receiving orthogonal frequency division multiplexed (OFDM) signals using subcarriers.

8. A user device comprising:

a processor;

a plurality of antennas;

a transceiver coupled to the processor and the plurality of antennas; and

a memory coupled to the processor which stores a codebook including pre-quantized channel vectors each having a length N, wherein N is a number of antennas at a multiple-antenna transmitter, and wherein N is greater than 1; and

wherein the processor, the transceiver, and the plurality of antennas are operable to, in a multi-user multiple input and multiple output (MIMO) mode;

transmit one index corresponding to one of the pre-quantized channel vectors to the multiple-antenna transmitter;

receive a signal from the multiple-antenna transmitter including data for at least two and no more than N user devices based on the transmitted index; and

recover data from the received signal, the data transmitted using the pre-quantized vector corresponding to the index.

9. The user device of claim 8, wherein the index is transmitted as channel state information (CSI).

10. The user device of claim 8, wherein receiving the signal from the multiple-antenna transmitter comprises receiving orthogonal frequency division multiplexed (OFDM) signals using subcarriers.

11. The user device of claim 8, wherein the codebook is used for all transmit powers.

12. The user device of claim 8, wherein the codebook further comprises pre-quantized channel matrices, and the processor, the transceiver, and the plurality of antennas are further operable to, in a second MIMO mode:

transmit a second index corresponding to one of the pre-quantized channel matrices to the multiple-antenna transmitter; and

receive a second signal from the multiple-antenna transmitter including second data for at least two and no more than N user devices based on the transmitted second index; and

recover second data from the received signal, the data transmitted using the pre-quantized matrix corresponding to the second index.

13. The user device of claim 12, wherein the second index is transmitted as channel state information (CSI).

14. The user device of claim 12, wherein receiving the second signal from the multiple-antenna transmitter comprises receiving orthogonal frequency division multiplexed (OFDM) signals using subcarriers.

15. A non-transitory computer-readable medium comprising instructions stored thereon which when executed by a processor of a user device operate the user device to:

store a codebook including pre-quantized channel vectors each having a length N, wherein N is a number of antennas at a multiple-antenna transmitter, and wherein N is greater than 1; and

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

transmit one index corresponding to one of the pre-quantized channel vectors to the multiple-antenna transmitter;

receive a signal from the multiple-antenna transmitter including data for at least two and no more than N user devices based on the transmitted index; and

recover data from the received signal, the data transmitted using the pre-quantized vector corresponding to the index.

16. The non-transitory computer-readable medium of claim 15, wherein the index is transmitted as channel state information (CSI).

17. The non-transitory computer-readable medium of claim 15, wherein receiving the signal from the multiple-antenna transmitter comprises receiving orthogonal frequency division multiplexed (OFDM) signals using subcarriers.

18. The non-transitory computer-readable medium of claim 15, wherein the codebook is used for all transmit powers.

19. The non-transitory computer-readable medium of claim 15, wherein the codebook further comprises pre-quantized channel matrices, and the instructions, which when executed by the processor of the user device, further operate the user device to, in a second MIMO mode:

transmit a second index corresponding to one of the pre-quantized channel matrices to the multiple-antenna transmitter; and

receive a second signal from the multiple-antenna transmitter including second data for at least two and no more than N user devices based on the transmitted second index; and

recover second data from the received signal, the data transmitted using the pre-quantized matrix corresponding to the second index.

20. The non-transitory computer-readable medium of claim 19, wherein the second index is transmitted as channel state information (CSI).

21. The non-transitory computer-readable medium of claim 19, wherein receiving the second signal from the multiple-antenna transmitter comprises receiving orthogonal frequency division multiplexed (OFDM) signals using subcarriers.