Patent ID: 9385792
Filing Date: 2016-07-05
CPC Classification: H04B,H04L

Claim Text:
1. A method for transmitting a signal at a transmission end of a Multiple Input Multiple Output (MIMO) system, the method comprising: mapping one codeword for a retransmission among two codewords to N layer among M layers, wherein N and M positive integers, and N is smaller than M, wherein the one codeword was mapped to the N layer when an initial transmission occurs; precoding the N layer based on a precoding matrix predefined for the M layers; and transmitting the precoded N layer and control information including Modulation Coding Scheme (MCS) values for the one codeword and another codeword of the two codewords to a reception end, wherein the N layer is a portion of the M layers, wherein the one codeword is used for signal transmission and the another codeword is not used for the signal transmission, wherein a transmission power of the N layer is boosted to a transmission power of the M layers, wherein the MCS value for the another codeword is 0, and wherein the MCS value for the one codeword is increased to a value corresponding to the transmission power of the M layers.