摘要
针对采用码分多址接入(CDMA,Code Division Multiple Access)的多输入多输出系统(MIMO,Multiple Input Multiple Output),建立多个用户同步上行接入基站的信道模型,收发端都采用2根天线。在基站端,由于扩频码非完全正交产生多个用户之间干扰和信道干扰影响信号检测的问题,分析并给出了多用户信号的最大似然函数,利用球形译码算法实现多用户的联合检测(Joint MUD,Joint Multiple User Detection),并行处理信道干扰和多址干扰。仿真结果表明,提出的接收机有较好性能,同时降低了运算的复杂度。
The multiple-input multiple-output（MIMO） system with code-division-multiple-access（CDMA） technique is considered.The channel model of multi-user uplink access is established,in which the receiver and each user are equipped with two antennas.To solve the multi-access interference and the channel interference,the maximum likelihood function of all the user is proposed and the sphere decoding is used for joint multi-user detector.Simulation results show that the proposed receiver is of better performance than the receivers based on conventional MUD method.
出处
《通信技术》
2011年第9期56-58,共3页
Communications Technology
