Patent ID: 8750401

Claim:
A transmission beamforming apparatus generating a transmission beam based on a codebook, the apparatus comprising: a codebook storage unit to store a transmission codebook generated based on a Hadamard matrix; and a transmission beamforming unit to generate the transmission beam based on a weighted-vector of the transmission codebook or channel information, wherein the channel information includes a weighted-vector that is based on a channel condition, wherein the weighted-vector based on the channel condition is calculated by performing: estimating a channel gain, by sequentially changing a reception beam of a reception beamforming apparatus based on a reception codebook of the reception beamforming apparatus for each change of a transmission beam of the transmission beamforming apparatus based on the transmission codebook; and using both a channel gain estimated with respect to a reception beam that maximizes a diversity gain calculated based on the estimated channel gain and the transmission codebook of the transmission beamforming apparatus.