Patent ID: 8594218
Filing Date: 2013-11-26
Classification: H04B,H04L

Abstract:
1. A method of transmitting a precoding matrix in a multi-input, multi-output (MIMO) system, the method performed at a receiver and comprising: determining a plurality of non-zero unitary sub-matrices on a diagonal line of the precoding matrix using channel state information with a transmitter, wherein the precoding matrix comprises the plurality of non-zero unitary sub-matrices arranged in a block diagonal format and zero elements, and wherein the precoding matrix is specific to the receiver; and transmitting feedback information to the transmitter, wherein the feedback information indicates all of the plurality of determined non-zero unitary sub-matrices, wherein the precoding matrix is denoted by the plurality of non-zero unitary sub-matrices are denoted by a pseudo inverse of a channel matrix is denoted by and values of a, b, c and d are directly calculated in accordance with following equations: where, when i=1, a i equals a, b i equals b, G i (1) equals G 1 , and G i (2) equals G 2 , and where, when i=2, a i equals c, b i equals d, G i (1) equals G 3 , and G i (2) equals G 4 .