METHOD OF CODEWORD FEEDBACK AND DATA TRANSMITION USING THE FEEDBACK

摘要

PURPOSE: A codeword feedback method and a data transmission method using a feedback are provided to improve the performance of a wireless communication system by performing a codeword feedback efficiently. CONSTITUTION: A channel is estimated by using a first signal received from a transmission terminal(S510), and a first codeword is selected from a differential codebook according to a diagonal matrix according to a channel estimation result(S520). The identification information of the first codeword is transmitted to the transmission terminal(S530). The codeword is selected as the first codeword, wherein the codeword results in an optimal precoding vector through the multiply with the previously used precoding vector according to the channel estimation result.