METHOD AND APPARATUS FOR PROCESSING FEEDBACK IN A WIRELESS COMMUNICATION SYSTEM

Abstract

A method and apparatus for processing feedback implemented in a wireless transmit/receive unit (WTRU) comprises estimating a channel matrix. The effective channel is calculated and a precoding matrix is selected. Feedback bits are generated and transmitted.

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Publication No	Technology	Declaration Information			Specification Information				Explicitly Disclosed	Patent Type	Status	National Phase Entries
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Technologies

Feedback

Product

Not Available

Use Cases

Wireless communication

Services

Not Available

Claim

1. A method for processing feedback bits implemented in a wireless transmit/receive unit (WTRU), comprising:
estimating a channel matrix by the wireless WTRU;
calculating an effective channel;
selecting a precoding matrix from a set of precoding matrices;
computing a differential precoding matrix or delta matrix;
quantizing the differential precoding matrix or delta matrix;
generating the feedback bits by the WTRU; and
transmitting the feedback bits from the WTRU, wherein the set of precoding matrices is constructed using a Discrete Fourier Transform (DFT) matrix multiplied with different phase shifts.
2. The method of claim 1 wherein selecting the precoding matrix includes selecting the precoding matrix based upon a metric, wherein the metric includes any one of the following: signal to interference noise ratio (SINR), throughput, block error rate (BER), frame error rate, and channel capacity.
3. The method of claim 1 wherein the effective channel is a multiplication of the channel estimate with precoding matrices.
4. The method of claim 1 wherein selecting the precoding matrix includes calculating the precoding matrix from the channel matrix estimate.
5. The method of claim 4 wherein selecting the precoding matrix further comprises:
quantizing the precoding matrix using a predetermined codebook.
6. The method of claim 1 wherein the feedback bits include a codeword index.
7. The method of claim 1, further comprising:
updating the precoding matrix.
8. A method for processing feedback bits implemented in a wireless transmit/receive unit (WTRU), comprising:
constructing a set of precoding matrices using a Discrete Fourier Transform (DFT) matrix multiplied with different phase shifts;
selecting a precoding matrix from the set of precoding matrices by the by the wireless WTRU;
computing a differential precoding matrix or delta matrix;
quantizing the differential precoding matrix or delta matrix;
generating the feedback bits by the WTRU; and
transmitting the feedback bits from the WTRU.
9. The method of claim 8 wherein the feedback bits include a codeword index.
10. The method of claim 8, further comprising:
updating the precoding matrix.
11. A wireless transmit/receive unit (WTRU), comprising:
a channel estimator configured to receive a signal and estimate a channel; and
a feedback bit generator in communication with the channel estimator, the feedback bit generator configured to determine a precoding matrix from a set of precoding matrices, generate a differential feedback bit and transmit the differential feedback bit, wherein the set of precoding matrices is constructed using a Discrete Fourier Transform (DFT) matrix multiplied with different phase shifts.
12. The WTRU of claim 11 wherein the feedback bit generator is further configured to generate a binary feedback bit.
13. The WTRU of claim 11 wherein the feedback bit generator is configured to generate a non-differential feedback bit.
14. The WTRU of claim 11 wherein the precoding matrix is determined based upon at least one of: a signal to interference noise ratio (SINR), a throughput, a block error rate (BER), a frame error rate, or a channel capacity.
15. The WTRU of claim 11, wherein the feedback bit generator is further configured to determine a feedback rate based at least in part on a Doppler adjustment.
16. A wireless transmit/receive unit (WTRU), comprising:
a channel estimator configured to receive a signal and estimate a channel; and
a feedback bit generator in communication with the channel estimator, the feedback bit generator configured to determine a precoding matrix from a set of precoding matrices, generate a binary feedback bit and transmit a binary feedback bit, wherein the set of precoding matrices is constructed using a Discrete Fourier Transform (DFT) matrix multiplied with different phase shifts.
17. The WTRU of claim 16 wherein the feedback bit generator is configured to generate a non-differential feedback bit.
18. The WTRU of claim 16 wherein the feedback bit generator is configured to generate a differential feedback bit.
19. The WTRU of claim 16 wherein the precoding matrix is further determined based upon at least one of: a signal to interference noise ratio (SINR), a throughput, a block error rate (BER), a frame error rate, or a channel capacity.
20. The WTRU of claim 16, wherein the feedback bit generator is further configured to determine a feedback rate based at least in part on a Doppler adjustment.

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