MULTIPLE INPUT MULTIPLE OUTPUT COMMUNICATION SYSTEM FOR ROTATING REFERENCE CODEBOOK INCLUDING CODEDWORDS OF DISCRETE FOURIER TRANSFORMATION CODEBOOK

摘要

PURPOSE: A multiple input multiple output communication system for a rotating reference codebook including codedwords of a discrete Fourier transformation codebook is provided to calculate a rotating matrix calculated based on a certain codeword among the codewords included in a discrete Fourier transformation codebook. CONSTITUTION: A selection unit(823) selects a previous preference codeword based on vectorized channel information, and a calculation unit(824) calculates a rotating matrix based on the previous preference codeword. A generating unit(825) generates a new codebook by rotating a reference codebook through the rotating matrix. The generating unit uses the rotating matrix to create a new preference codeword by rotating at least one codeword included in the reference codebook.