多径衰落下基于多码检测的多天线CDMA信道容量分析  

Capacity of MIMO CDMA Based on Multi-Code Detection under Multi-Path Fading Channel

作　　者：王军选[1] 尧文元[2] 廖汉程[2] 

机构地区：[1]西安邮电学院通信工程系,西安710061 [2]江西财经大学电子学院,南昌330013

出　　处：《北京邮电大学学报》2006年第3期99-102,共4页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(69931050)

摘　　要：研究了基于LS码和Walsh码多天线CDMA系统在干扰方差已知和干扰方差未知2种情况下的容量,给出了理论分析.仿真结果表明,使用LS码的系统容量远远大于基于使用Walsh码的CDMA系统;干扰方差对LS码系统没有任何影响,容量与信噪比呈线性关系;而对于传统CDMA系统,干扰方差未知要损失一定的容量,并且在信噪比大于18 dB时有平台效应.The capacity of multi-antennas CDMA systems with LS codes and Walsh codes under known and unknown interference covariance is analyzed theoretically. Both theoretical and simulation results show that the capacity of CDMA systems based on LS codes is much larger than that on Walsh codes; the interference covariance has no influence on capacity for LS CDMA systems, and capacity is linear with SNR when using multi-code detection; but it will loss certain capacity under unknown interference covariance for conventional CDMA systems, and form a floor when SNR is great than 18 dB.

关 键 词：信道容量 扩频地址码 多码检测 

分 类 号：TN929.5[电子电信—通信与信息系统]