Class A噪声衰落信道下空时分组码的性能估计  

Evaluation of space-time block coding over fading channels with Class A noise

作　　者：宫宇[1] 王旭东[1] 庞福文[1] 

机构地区：[1]大连海事大学信息科学技术学院,辽宁大连116026

出　　处：《大连海事大学学报》2008年第4期102-106,共5页Journal of Dalian Maritime University

基　　金：国家自然科学基金资助项目(60672030);交通应用基础研究资助项目(2007329225020);辽宁省自然科学基金资助项目(20082142);辽宁省教育厅科技研究项目(2008S027)

摘　　要：为获得非高斯噪声环境衰落信道中正交空时分组码(OSTBC)的性能估计,对OSTBC的成对差错概率(PEP)进行了研究.基于物理统计Middleton Class A噪声模型,通过将非高斯Class A分布变换成条件高斯分布,给出空间依赖时间独立条件下OSTBC系统中噪声信号的联合概率密度函数.利用矩母函数(MGF)分析法推导Class A噪声环境下最大似然接收机的成对差错概率的上界.对不同衰落信道中系统误符号率(SER)性能的仿真研究表明,在Class A噪声环境下,OSTBC系统性能随噪声脉冲性的增强而下降.The average pairwise error probability （PEP） of orthogonal space-time block coding （OSTBC） was investigated to evaluate the performance of OSTBC over fading channels with non-Gaussian noise. Based on statistical-physical Middleton Class A noise model, the joint probability density function （pdf） of the noise signals in OSTBC systems under the assumption of dependence in space and independence in time was presented by transforming the non-Gaussian distribution into conditioned Gaussian distribution. Then the upper bound of PEP was derived for the maximum likelihood （ML） receiver in Class A noise environment with the moment generating function （MGF）. Simulations for symbol error rate （SER） over various fading channels show that the performance of OSTBC decreases with the impulsive nature of the noise increasing in Class A noise environment.

关 键 词：Middleton Class A噪声模型 衰落信道 正交空时分组码(OSTBC) 成对差错概率(PEP) 误符号率(SER) 

分 类 号：TN92[电子电信—通信与信息系统]