A joint precoding and beamforming algorithm for multi-relay multiuser MIMO-OFDM systems

Based on amplify-and-forward cooperative relay multi-relay multi-user system, in order to reduce the bit error rate of OFDM-based wireless systems, a practical limited bits feedback precoding algorithm is proposed. Using matrix singular value decomposition, designs optimized precoding matrices beamforming vectors. Source precoding and relay beamforming matrices are jointly optimized. The precoding and beamforming matrices index can be fed back using offline codebooks. Achievable sum-rate formula is derived. Simulations indicate the effectiveness of the proposed joint precoding and beamforming design. The proposed method can improve bit-error-rate performance and can obtain good sum-rate performance contrast to existing algorithm. It is a practical scheme of multi-user networks for linear algorithm.