MIMO信道中基于功率分配的SLNR预编码算法

摘要

为了消除或降低多用户MIMO系统下行链路存在的共信道干扰( CCI)，提出一种结合功率分配的基于最大化信漏噪比( SLNR)的预编码算法。首先，根据SLNR算法求出最优预编码矩阵，再结合最优功率分配算法，借助拉格朗日乘数法，优化分配每个用户的发送功率，从而提高系统和容量以及降低误码率( BER)性能。为了简化计算复杂度，还提出了SLNR算法结合次优化功率分配算法。仿真表明，所提出的算法比块对角化( BD)算法和最小均方误差准则( MMSE)算法在系统和容量以及误码率性能上都有所改善。%To eliminate or reduce the Co-Channel Interference ( CCI) between users,a precoding algorithm combined with power alloca-tion,based on maximizing Signal to Leakage and Noise Radio ( SLNR) ,is proposed for the downlink of multi-user MIMO system. On the basis of SLNR,find the optimal precoding matrix,and then with the aid of Lagrange multiplier method,coupled with the optimal pow-er allocation algorithm,allocate every user’ s transmitted power optimally,in order to improve the system sum capacity and reduce Bit Er-ror Rate (BER) performance. Suboptimal power allocation algorithm,combined with SLNR is proposed to simplify the computational complexity. The simulation results show that the proposed algorithm can make system has better performance on the system sum capacity and BER than BD and MMSE algorithm.