Robust Joint Beamforming for MIMO Relay Broadcast Systems with Limited Feedback

Abstract

Considering the user with multiple antennas in MIMO relay limited feedback systems. Duo to quantization errors of channel direction information (CDI), the rates and capacity of system are decreased. Aiming at this problem, we analyzed the statistics of quantization error of CDI and proposed two robust linear beamforming schemes which based on block diagonalization (BD) criterion and minimum mean square error (MMSE) criterion respectively. The simulation results and analyses show that the proposed schemes decreases the average bit error rate (BER) compared with conventional schemes.