论文部分内容阅读
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。
For the Multiple Input Multiple Output (MIMO) system using Code Division Multiple Access (CDMA), a channel model for multiple users to synchronize uplink access to a base station is established. Both the receiving end and the receiving end use two antenna. At the base station, due to the non-orthogonal spreading code spreading multiple users interference and channel interference affect the signal detection problem, analysis and gives the maximum likelihood function of multi-user signal, the use of spherical decoding algorithm to achieve multi-user Joint MUD (Joint Multiple User Detection), parallel processing of channel interference and multiple access interference. The simulation results show that the proposed receiver has better performance and reduces the computational complexity.