Adaptive precoding codebooks for wireless communications
First Claim
Patent Images
1. A method of wireless communication comprising:
- at a processor, reading a baseline codebook of at least a rank-2, the baseline codebook comprising codewords representing precoding matrices; and
generating an adaptive codebook by;
multiplying a first column of a codeword of the baseline codebook with a first transform matrix calculated from a channel correlation matrix, andmultiplying a second column of the codeword with a second transform matrix calculated from the channel correlation matrix, wherein the first transform matrix and the second transform matrix are distinct orthogonal matrices, and wherein the first transform matrix and the second transform matrix are not part a common matrix;
after generating the adaptive codebook, selecting a codeword index of the adaptive codebook to quantize channel state information; and
sending the selected codeword index to a transmitter.
1 Assignment
0 Petitions
Accused Products
Abstract
Adaptive precoding codebooks are described. In one embodiment, the method of wireless communication includes reading at least a rank-2 baseline codebook having codewords representing precoding matrices. An adaptive codebook is generated by multiplying a first column of the codeword with a first transform matrix calculated from a channel correlation matrix, and multiplying a second column of the codeword with a second transform matrix calculated from the channel correlation matrix. The first and the second transform matrices are orthogonal.
-
Citations
20 Claims
-
1. A method of wireless communication comprising:
-
at a processor, reading a baseline codebook of at least a rank-2, the baseline codebook comprising codewords representing precoding matrices; and generating an adaptive codebook by; multiplying a first column of a codeword of the baseline codebook with a first transform matrix calculated from a channel correlation matrix, and multiplying a second column of the codeword with a second transform matrix calculated from the channel correlation matrix, wherein the first transform matrix and the second transform matrix are distinct orthogonal matrices, and wherein the first transform matrix and the second transform matrix are not part a common matrix; after generating the adaptive codebook, selecting a codeword index of the adaptive codebook to quantize channel state information; and sending the selected codeword index to a transmitter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A method of wireless communication comprising:
-
at a mobile user device, generating an adaptive codebook by transforming a predefined baseline codebook of at least a rank-2, the baseline codebook comprising codewords representing precoding matrices, wherein the transforming comprises; multiplying a first column of a codeword of the baseline codebook with a first transform matrix calculated from a channel correlation matrix, and multiplying a second column of the codeword with a second transform matrix calculated from the channel correlation matrix, wherein the first transform matrix and the second transform matrix are distinct orthogonal matrices, and wherein the first transform matrix and the second transform matrix are not part a common matrix; and after generating the adaptive codebook, selecting a codeword index of the adaptive codebook to quantize channel state information; and sending the selected codeword to a transmitter. - View Dependent Claims (14, 15)
-
-
16. A method of wireless communication comprising:
-
at a base station, generating an adaptive codebook by transforming a predefined baseline codebook of at least a rank-2, the predefined baseline codebook comprising codewords representing precoding matrices, wherein the transforming comprises; multiplying a first column of a codeword of the predefined baseline codebook with a first transform matrix calculated from a channel correlation matrix, and multiplying a second column of the codeword with a second transform matrix calculated from the channel correlation matrix, wherein the first transform matrix and the second transform matrix are distinct orthogonal matrices, and wherein the first transform matrix and the second transform matrix are not part of a common matrix; after generating the adaptive codebook, at a receiver, selecting a codeword index of the adaptive codebook to quantize channel state information; and sending the selected codeword index to a transmitter. - View Dependent Claims (17, 18, 19, 20)
-
Specification