Patent ID: 8724728

Claim:
A communication method of a transmitter, the method comprising: generating second codewords corresponding to first codewords included in a first codebook within a set including unitary matrices, based on a matrix associated with statistics of a channel matrix between the transmitter and a receiver; receiving, from the receiver, information associated with at least one second codeword selected by the receiver from the generated second codewords; computing a channel subspace correlation between the receiver and at least one second receiver different from the receiver, based on at least one quantized channel covariance matrix that is computed based on the received information associated with the selected at least one codeword, and a quantized channel covariance matrix of the at least one receiver; performing scheduling based on a comparison between the channel subspace correlation and a threshold; and performing precoding based on information associated with the selected at least one second codeword in response to the receiver being scheduled.