Channel information generating device and method for spatial division multiplexing algorithm in a wireless communication system, and data transmission apparatus and method adopting the same

A data transmission apparatus using generated channel information for spatial division multiplexing in an Orthogonal Frequency Division Multiplexing (OFDM)-based wireless communication system that uses Multiple-Input Multiple-Output (MIMO) antennas, comprising:

• a codebook storage unit configured to store a predefined codebook;
• a reception unit configured to receive channel correlation coefficient information between subcarriers and index information from a receiver;
• a channel estimation unit configured to for obtain estimated channel information based on the channel correlation coefficient information and a matrix corresponding to the index information among matrices included in the codebook;
• and
• a precoding generation unit configured to generate precoding information so that data can be transmitted based on the estimated channel information via the spatial division multiplexing,
• 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.

A channel information generation method for spatial division multiplexing in an Orthogonal Frequency Division Multiplexing (OFDM)-based wireless communication system that uses Multiple-Input Multiple-Output (MIMO) antennas, the method comprising:

• receiving channel information corresponding to each of subcarriers;
• calculating channel correlation coefficient information between the subcarriers based on the received channel information;
• calculating an index of an optimal matrix of matrices included in a prestored codebook based on the received channel information, the channel correlation coefficient information, and the codebook;
• and
• transmitting the channel correlation coefficient information and index information about the index of the optimal matrix to a transmitter,
• wherein the calculating the index comprises:
• estimating channel information about a k-th subcarrier based on the channel correlation coefficient information, the codebook, and estimated channel information of a (k−1)-th subcarrier;
• and
• calculating an index of an optimal matrix for the k-th subcarrier based on the received channel information and the estimated channel information about the k-th subcarrier.

A data transmission method using generated channel information for spatial division multiplexing in an Orthogonal Frequency Division Multiplexing (OFDM)-based wireless communication system that uses Multiple-Input Multiple-Output (MIMO) antennas, the method comprising:

• receiving channel correlation coefficient information between subcarriers and index information from a receiver;
• estimating channel information based on the channel correlation coefficient information and a matrix corresponding to the index information among matrices included in a codebook;
• and
• generating precoding information so that data is transmitted based on the estimated channel information via the spatial division multiplexing,
• 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.