Rate Maximization Precoding Design for VLC Multi-user System and Its Application in Library
In recent years,Visible-Light Communication(VLC)has been recognized as one of the key technologies for future 6G due to its compatibility with several key dimensions such as high energy efficiency,high reliability,and ubiquitous access for space-air-ground-sea integration.In VLC multi-user multi-receiver downlink concurrent access process,due to the influence of the channel correlation and multi-user interference,the sub-channel gains after precoding are very different,and the poor sub-channel seriously affects the system performance.To solve this problem,considering the visible light channel model of intensity modulation/direct detection,a system achievable sum rate maximization precoding design based on Block Diagonalization(BD)algorithm for VLC multi-user system is proposed under the constraint of non-negative of the transmitted signal and the total power,the analytical expression of power allocation for sub-channels to maximize rate is also provided,and the precoding matrix is iteratively optimized based on the subspace traces and the test is applied.Experimental results show that the sum rate of the proposed system is significantly improved compared to the basic algorithm.
VLCmulti-user interferenceprecodingachievable sum rate
万方数据
维普
