Codebook generation apparatus, generation method and data transmission method

An apparatus for generating a transmission code book in the communications system of the codebook generation apparatus of the present invention comprises a MIMO (multi input multi output, MIMO) antenna, a portion frequency determining that the transmission code book determining a frequency so as to have the best characteristics, pre-matrix generation unit which generates a pre-matrix based on the frequency, and generates a retransmission codebook is used for retransmission on the basis of the pre-matrix, and includes the retransmission based on the code book portion codebook generator for generating the transmission code book. Codebook, preprocessing matrix, precoding, MIMO