Patent ID: 7907913

Claim:
A receiver in a codebook-based transmission beamforming system, comprising: a predictor for generating forthcoming channel values for a forthcoming period using M present and previous channel estimates; an effective channel gain calculator for calculating effective channel gains for transmission beamforming vectors included in a codebook using the forthcoming channel values generated by the predictor; and a codebook selector for feeding back a codebook index corresponding to the maximum effective channel gains received from the effective channel gain calculator to a transmitter; wherein the effective channel gain calculator calculates effective channel gains j k,d (w) for each transmission beamforming vector w by J k,d ( w )= w H R ( k,mP+d ) w R ( k,mP+d )≡{circumflex over ( H )} MMSE H ( k,mP+d ){circumflex over ( H )} MMSE ( k,mP+d ) where Ĥ MMSE is a forthcoming channel value, k is a subcarrier index, P is a feedback interval, m is a feedback index, and d is a time offset.