Patent ID: 9531460
Filing Date: 2016-12-27
CPC Classification: H04B,H04L

Claim Text:
1. A method for transmitting a 4-antenna precoding matrix, comprising: determining a rank used for indicating a number of transmission layers; determining a value of a first codebook index corresponding to one precoding matrix set in a codebook set, wherein the codebook set corresponds to the rank, and precoding matrices comprised in the codebook set are represented by the first codebook index and a second codebook index; determining a jointly coded value corresponding to the rank and the value of the first codebook index, wherein the jointly coded value and the rank have a first correspondence, and the jointly coded value and the first codebook index have a second correspondence; and sending the jointly coded value to a base station, wherein the precoding matrices (W) comprised in the codebook set satisfy the equation: wherein: and a value range of n is a set {0, 1, 2, 3, 4, 5, 6, 7}, {8, 9, 10, 11, 12, 13, 14, 15}, {0, 2, 4, 6}, {1, 3, 5, 7}, {8, 10, 12, 14}, or {9, 11, 13, 15}; and the first codebook index corresponds to one value of n, wherein the correspondence between the jointly coded value and the rank, and the correspondence between the jointly coded value and the first codebook index are determined according to the following Table D: wherein I