Patent ID: 8509052

Claim:
A channel information generation apparatus for spatial division multiplexing in an Orthogonal Frequency Division Multiplexing (OFDM)-based wireless communication system which uses Multiple-Input Multiple-Output (MIMO) antennas, the apparatus comprising: a codebook storage unit configured to store a predefined codebook; a channel correlation information calculation unit configured to receive channel information corresponding to each of subcarriers, and calculate channel correlation coefficient information between the subcarriers based on the channel information; an index calculation unit configured to calculate an index of an optimal matrix of matrices included in the codebook stored in the codebook storage unit based on the channel information, the channel correlation coefficient information, and the codebook; and a transmission unit configured to transmit the channel correlation coefficient information and index information about the index of the optimal matrix to a transmitter, wherein the index calculation unit is configured to obtain estimated channel information about a k-th subcarrier of the subcarriers based on the channel correlation coefficient information, the codebook, and estimated channel information about a (k−1)-th subcarrier, and calculate an index of an optimal matrix for the k-th subcarrier based on the channel information and the estimated channel information about the k-th subcarrier.