Patent ID: 8111782

Claim:
A method for receiving data in a closed-loop multi-antenna system that defines multiple antenna groups by antenna grouping on multiple antennas, and performs data transmission individually via each of the multiple antenna groups, the method comprising the steps of: acquiring, from a received signal, channel quality information for each data stream transmitted individually via each antenna group corresponding to a transmission mode, which is one of a multi-user mode and a single-user mode selected depending on a comparison result between a sum rate (R_MU) in the multi-user mode and a sum rate (R_SU) in the single-user mode calculated by using a feedback information; determining, from the channel quality information acquired individually for each antenna group, maximum channel quality information, an antenna group index associated with the maximum channel quality information, rank information, and remaining channel quality information associated the rank information; and transmitting the determined maximum channel quality information, antenna group index, rank information, and remaining channel quality information to a transmission apparatus as the feedback information.