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文章研究多用户MIMO下行链路中线性预编码器和译码器的联合优化问题。采用的优化准则是在总发射功率约束下最小化系统的和均方误差(Sum MSE,SMSE),提出了一种启发式的迭代算法。通过在接收端引入相同的自动增益控制因子,该算法对预编码器和译码器进行交替优化,直到SMSE达到最小值。分析和仿真结果表明:该算法具有较低的复杂度和良好的收敛特性,符号差错率也优于现有算法。
This paper studies the joint optimization of linear precoders and decoders in multiuser MIMO downlink. The optimization criterion adopted is to minimize the systematic sum-mean square error (Sum MSE, SMSE) under the constraint of total transmit power, and propose a heuristic iterative algorithm. By introducing the same automatic gain control factor at the receiving end, the algorithm alternately optimizes the precoder and decoder until the SMSE reaches its minimum value. The analysis and simulation results show that the proposed algorithm has lower complexity and better convergence, and the symbol error rate is better than the existing algorithms.