Nakagami衰落信道上编码MIMO WCDMA系统性能分析  

Performance Analysis of Coded MIMO WCDMA Systems in Nakagami Fading Channels

作　　者：徐福永[1] 李光球[1] 

机构地区：[1]杭州电子科技大学通信工程学院,杭州310018

出　　处：《电子科技大学学报》2006年第6期872-875,共4页Journal of University of Electronic Science and Technology of China

基　　金：国家自然科学基金资助项目(69972014);教育部高等学校骨干教师计划资助项目

摘　　要：研究了多址干扰下,MIMOWCDMA系统发射端采用空时分组码和卷积码、接收端采用最大比合并天线分集和软判决译码方案的误码性能。使用Q(x)的另一种数学表达式和信干噪比的矩生成函数,推导了Nakagami-m衰落信道上存在多址干扰以及发射端发射不等功率下,卷积编码系统的成对差错概率和误码性能联合限。讨论了在各种编码方案下空间路径分集接收机的误码性能。数值计算结果表明组合空间分集和卷积编码能显著改善MIMOWCDMA系统的误码性能。分析结果适用于MIMOWCDMA系统的上下行链路。The error probability performance for MIMO WCDMA systems with the space-time block codes and convolutional codes employed at the transmitter, maximal-ratio-combining antenna diversity and soft decoding schemes employed at the receiver is investigated under the condition of multiple access interference. Based on the alternative representations of Q（x） and the moment generating function of SINK, the pairwise error probability of a convolutional coded system and union upper bound of error performance are derived under the condition of multiple access interference and nonidentical average transmitted power at each transmit antenna in Nakagami-m fading channels.The performance of a space-path diversity receiver in various coding schemes is illustrated. Numerical results show that the combination of convolutional coding and spatial combining leads to a dramatic performance improvement for MIMO WCDMA systems. The analysis result can be applied to uplink and downlink of MIMO WCDMA systems.

关 键 词：多输入多输出系统 天线分集 卷积编码 多址干扰 NAKAGAMI衰落 成对差错概率 

分 类 号：TN911.22[电子电信—通信与信息系统]