多用户MIMO下行链路线性收发机设计

该文提出一种以最小化系统总均方误差(Sum MSE)为准则，迭代设计线性收发机的方案。该方案通过对接收机的改进设计，能够有效地避免传统MMSE设计过程中出现的拉格朗日乘子不易计算的缺点，大大降低设计复杂度。由于拉格朗日乘子有解析解，发射预编码矩阵也有闭式解，并且可以通过定点迭代算法有效解出。收端的接收机也不用基站下发，只要各自采用MMSE均衡即可。仿真结果证明该方法的有效性。

Linear Transceiver Design for Multiuser MIMO Downlink

An iterative linear transceiver design scheme under Sum Mean Squared Error (SMSE) minimization criterion is proposed. By modifying the structure of transceiver, the complex computation of Lagrangian multiplier within traditional MMSE transceiver design can be effectively obviated, and thus the whole system complexity can be greatly reduced. Because the Lagrangian multiplier has analytical solution, transmit precoding matrix also has closed-form solution, and can be solved easily with fixed-point iterations. The receiver filter is worked out independently with MMSE criterion at each terminal, and the downlink signaling of each receiver filter from basestation is not necessary. Simulations demonstrate that the proposed scheme is effective.