Cone Codebook for Limited Feedback Beamforming over Correlated MIMO Channels

A new beamforming codebook design is proposed to reduce the feedback rate of quantized beamforming MIMO systems over temporally correlated channels. Based on a first-order Gauss-Markov fading model, we develop an adaptive cone codebook that can fold or expand to adapt to the interframe temporal correlations of the channel and rotate to track the time-varying channel. Through Monte Carlo simulations, we demonstrate that the proposed cone codebook based limited feedback scheme outperforms the conventional scheme with fixed codebook and compresses the feedback bits without degrading the system performance.