Limited feedback precoding for multiuser MIMO systems based on array preprocessing

In this paper, considering the problem of performance loss due to limited feedback in multiuser MIMO downlink systems, a novel limited feedback precoding for multiuser MIMO systems based on array preprocessing is proposed. The maximum SINR criteria is used for selecting optimal codeword from the Grassmannian codebook and perturbation codeword at the receiving, and feedback the Grassmannian precoding codeword index and perturbation codeword index to the transmitter, then the array preprocessing is used at the transmitter and receiver to get optimal capacity, and compensate for the performance loss due to the limited feedback. Simulation results show that the proposed method to ensure the cost of the feedback link, the system throughput and BER performance are improved effectively.