多用户MIMO下行链路中线性预编码器/译码器设计

Design of linear precoders/decoders for multiuser MIMO downlink

研究多用户MIMO下行链路中最小和均方误差意义下线性预编码器/译码器的设计问题。针对该非线性、非凸性的优化问题,传统的联合优化算法性能有限且复杂度较高。提出一种新的设计方案。该方案首先利用信道正交化技术将MIMO下行信道分解成多个并行的等效单用户MIMO信道,然后通过解这些等效MIMO信道上的单用户均方误差最小化问题来获得和均方误差最小问题的近似解。仿真结果显示,该方案的性能要优于传统的联合优化算法。

This paper deals with the design of linear precoders/decoders for multiuser MIMO downlinks in terms of minimizing the sum-mean square error. The conventional joint optimization algorithm to solve this non-linear and non-convex optimization problem suffers from its high complexity and limited performance. In this paper, a novel scheme is proposed. This scheme decomposes the MIMO downlink into several parallel effective single-user MIMO channels and solves these single-user minimum mean square error problems to obtain the approximate optimum of the original that the performance of the proposed scheme is sum-mean square error problem. The simulation results show superior to the conventional algorithm.