APPARATUS AND METHOD FOR DETERMINING BEAMFORMING VECTOR IN BEAMFORMING SYSTEM USING CODEBOOK

摘要

An apparatus and a method for determining a beamforming vector in a codebook-based beamforming system are provided to improve link performance by determining feedback information in consideration of a time-variant channel and to guarantee that a beamforming vector, created based on feedback information, is optimal at a specific time interval. A receiver in a codebook-based transmission beamforming system comprises a linear MMSE(Minimum Mean Square Error) predictor(412), an effective channel gain calculator(414), and a codebook selector(416). The linear MMSE predictor(412) creates future channel values for a specific interval of the future by using M numbers of channel estimation values of the past from the present. The effective channel gain calculator(414) calculates and outputs effective channel gain values for all the transmission beamforming vectors of a codebook by using the future channel values. The codebook selector(416) feeds back a codebook index equivalent to the maximum value among the outputted effective channel gain values to a transmitter.