宏最大比合并系统的中断性能分析与仿真  

Outage Probability for Macroscopic Maximal Ratio Combining Systems: Theoretical Expressions and Simulation Results

作　　者：王晓东[1] 卜智勇 王文[1] 

机构地区：[1]海军航空工程学院电子工程系 [2]上海无线通信研究中心,上海200050

出　　处：《系统仿真学报》2007年第10期2279-2282,共4页Journal of System Simulation

基　　金："863"计划项目(2005AA123510)

摘　　要：利用矩生成函数和高斯-厄米特积分推导出Nakagami-Lognormal信道环境下宏最大比合并系统输出信噪比概率密度函数的闭式表示,并由此分析了系统的中断概率。仿真结果验证了表达式的正确性。分析表明在分布式接入系统中影响系统中断性能的主要因素是阴影衰落;对于分集支路的不均衡情况,阴影和小尺度衰落的不均衡对性能影响较小,而区域均值的不均衡对中断性能有显著的影响。Closed-form expressions for the probability density function of macroscopic maximal ratio combining output SNR were derived by means of moment generating function and Gauss-Hermite quadrature, and outage analysis was considered for different parameter schemes over Nakagami-Lognormal channels. The theoretical expressions were verified by simulation results. The results show that the outage performance is impacted mainly by shadowing. Considering unbalanced branches, the unbalance of shadowing and multipath fading impact slightly outage performance, whereas area mean unbalance has a great influence on outage performance.

关 键 词：复合衰落 最大比合并 中断概率 矩生成函数 高斯-厄米特积分 

分 类 号：TN911.2[电子电信—通信与信息系统]