MIMO-MAC中一种改进的干扰消除方法

摘要

针对两用户的多输入多输出多址接入信道(MIMO-MAC)中存在共道干扰的问题，提出一种基于有限反馈的干扰消除方法，每个用户根据反馈信息对将要发送的信号进行对角化处理。通过合理设计预处理矩阵，对接收信号进行线性处理以消除共道干扰，从而提高系统的可靠性，使得接收端可以逐个符号地最大似然译码，降低译码复杂度。仿真结果表明，若接收端配置2根天线且系统采用4QAM调制，则当误比特率为10-3时，与已有基于有限反馈的干扰消除方案相比，该方案能获得2 dB的增益。%For the problem of co-channel interference over Multi-Input Multi-Output(MIMO) Multiple Access Channels(MAC) for two-user, an interference cancellation scheme is proposed, in which the transmitted signals are diagonalization processed according to feedback information. Through proper design of pretreatment matrices, the co-channel interference is eliminated after the linear processing of received signals. Not only the reliability is improved, but also each signal can be Maximum Likelihood(ML) decoded separately. Simulation results show that, with two antennas at the receiver and 4QAM adopted, the gain of the proposed scheme is 2 dB at the Bit Error Rate(BER) of 10-3 compared with the existing interference cancellation scheme.