Patent ID: 8457245

Claim:
A method of transmitting precoding information in a multiple antenna system, the method comprising: receiving codebook set information; selecting M subbands from a plurality of subbands constituting a whole frequency band in a descending order of a channel quality indicator (CQI), wherein M is an integer greater than 0; and transmitting a first precoding matrix indicator (PMI) for the selected M subbands and a second PMI for remaining subbands of the plurality of subbands, wherein the first PMI is a PMI of a codebook selected from a first codebook set comprising a plurality of predefined codebooks, wherein the second PMI is a PMI of a codebook selected from a second codebook set comprising a part of the plurality of predefined codebooks, wherein the part of the plurality of predefined codebooks is indicated by the received codebook set information, and wherein the PMI of the codebook selected from the second codebook set is a logical number assigned according to an order of codebooks of the second codebook set.