Patent ID: 8665984

Claim:
A method for precoding data in a wireless communication system, comprising: receiving, by a receiving device, at least one reference signal from a transmitting device; deriving, by the receiving device, a rank indication, a codebook index n 1 in a first codebook C 1 , codebook indices k 1 and k 2 in a second codebook C 2 , a wideband channel quality indicator CQI 1 and a subband channel quality indicator CQI 2 , based on the at least one reference signal; sending, by the receiving device, the rank indication, the codebook index n 1 in the first codebook C 1 , the codebook indices k 1 and k 2 in the second codebook C 2 , the wideband channel quality indicator CQI 1 and the subband channel quality indicator CQI 2 , to the transmitting device; and receiving, by the receiving device, data precoded by a first precoder from the transmitting device, wherein the first precoder is determined by the transmitting device based on the rank indication and the indices n 1 , k 1 and k 2 .