Patent ID: 8230290
Filing Date: 2012-07-24
Classification: H04B,H04L

Abstract:
1. A method for transmitting a signal from a transmitting end in a Multi-Input Multi-Output (MIMO) system that uses a Hybrid Automatic Repeat reQuest (HARQ) scheme, the method comprising: performing signal mapping according to a codeword-to-layer mapping scheme for retransmission when a codeword is a retransmission codeword and an initial transmission codeword corresponding to the retransmission codeword was transmitted by mapping to a plurality of layers, wherein the codeword-to-layer mapping scheme includes a scheme for mapping the retransmission codeword to the plurality of layers; performing precoding on the mapped signal based on a codebook for retransmission; and transmitting the precoded signal using a plurality of antennas, wherein the initial transmission codeword was transmitted with an additional initial transmission codeword, and the retransmission codeword is transmitted alone, and wherein the MIMO system supports both the codebook for retransmission and a codebook for initial transmission which is different from the codebook for retransmission.