多用户线性分散码与空间复用组合系统.pdfVIP

第 29 卷第 12 期 Vo l. 29 NQ. 12 哈尔滨工程大学学报 Dec. 2008 2008 年 12 月 Journal of Harbin Engineering University 多用户线性分散码与空间复用组合系统 预处理算法研究 刘彤，张林波，张曙 (哈尔滨工程大学信息与通信工程学院，黑龙江哈尔滨 150001) 摘 要:为了更有效地去除多用户下行链路的共道干扰，针对多用户线性分散码与空间复用组合系统，基于球形 检测算法原理，在假定基站已知信道状态信息的情况下，依据后验信噪比最大化准则提出一种改进的迫零预处理 算法.理论及仿真结果均证明:改进的迫零预处理算法不仅可以彻底去除用户间的共信道干扰，而且当下行链路 中发射天线数目增加时可以进一步提高系统性能. 关键词:多用户多输入多输出系统;下行链路预处理;迫零算法;天线选择 中图分类号 TN914.3 文献标识码 A 文章编号 1006-7043 (2008) 12-1330-05 Study of preprocessor of multi-user Iinear-dispersion code and spatial multiplexing combined system LIU Tong , ZHANG Lin-bo , ZHANG Shu CCollege of Information and Communication Engineering , Harbin Engineering University , Harbin 150001 , China) Abstract: To cancel co-channel interference more eHectively , an improved zero-forcing preprocessing algo rithm , based on sphere decoding algorithm and maxmiuming post SNR criterion , is proposed for downlin multi-user linear dispersed code and spatial multiplexing combined system in which complete channel stat information is available to the base station. Theory analysis and simulation results show this proposed ne , algorithm not only eHectively cancels co卢channel interference , but also improves the performance of th multi-user linear dispersed code and spatial multiplexing combined system when the number of transmittE antenna IS mcreasmg. Keywords: multi-user MIMO system; downlink preprocess; zero forcing algorithm; antenna selection 近 10 年来，蜂窝通信和无线局域网对容量的需 [2J提出将二者在空间上结合的方案.但由于该组f 方案不适合高