基于MMSE的多用户MIMO系统检测算法

Multi-user MIMO system detection algorithm based on MMSE

空分复用多用户多输入多输出(MIMO)系统具有很高的频谱利用率,由于其系统结构和所处的信道环境的复杂性,使得用户间缺乏协作关系,当用户间干扰消除有残差或信道估计不准确时,传统线性接收机不能获得理想的检测效果.针对这一问题,利用每个用户的自身信道对多用户系统用户端信道进行扩展重构,给出一种高效的基于最小化均方误差(MMSE)准则的检测算法,此算法利用扩展后的信道对用户端接收机进行优化,不仅易于实现,还可以获得较好的误码率性能,有效的减少了多用户干扰消除后的残差和信道估计误差对检测算法的影响.仿真结果表明了所提算法的有效性.

The spatial division multiplexing multi-user multiple-input multiple-output（MIMO） system has very high spectrum efficiency.However,its system structure and complexity of the channel environment make the lack of collaborative relationships between users.When the residual multi-user interference（MUI） and channel estimation error exist,the traditional linear receiver can not get the perfect detection effect.Aiming to solve the problems,this paper uses the channel of each user to extend and recombine the channel of the multi-user MIMO system receiver,and proposes an efficient detection algorithm based on minimizing the mean square error（MMSE）.The proposed algorithm utilizes the expanded channel to optimize the receiver.Therefore,it is easy to implement.Also,it can get good bit error rate（BER） performance and reduce the effect of residual MUI and estimation error.The simulation results show the effectiveness of the proposed algorithm.