增强合作中继系统在多径阴影联合衰落信道下的性能分析performance.pdfVIP

第 35 卷第 12 期 通 信 学 报 Vol.35 No. 12 2014 年 12 月 Journal on Communications December 2014 doi:10.3969/j .issn.1000-436x.2014.12.019 增强合作 中继系统在多径阴影联合衰落信道下的性能分析 程卫军，黄燕 （中央 民族大学 信息工程学院，北京 100081） 摘 要：针对数字通信系统在多径阴影联合衰落信道下不易获得性能闭式解 问题，运用 MG （mixture Gamma ） 模型近似 了 NL （Nakagami-lognormal ）衰落信道模型，在各跳具有独立不同衰落分布下研究和推导了增强合作中 继系统 误码率和 中断性能，数值和仿真分析验证 了理论分析 正确性 。结果表 明运用 MG 近似 NL 模型有助于 合作中继系统在多径阴影联合衰落信道下 性能研究。 关键词：增强合作中继；联合多径阴影衰落 ；混合 Gamma ；误码率；中断率 中图分类号：TN919.3 文献标识码：A 文章编号：1000-436X(2014 12-0162-06 Performance analysis of incremental cooperative relaying system over composite multipath/shadowing fading channels CHENG Wei-jun, HUANG Yan (School of nformation Engineering, Minzu University of China, Beij ing 100081, China) Abstract: Since the performance metrics of digital communication systems over composite multipath/lognormal fading channels is intractable, a mixture Gamma (MG fading model is used to approximate Nakagami-lognormal (NL fading model. By using MG fading channel model, some exact closed-form expressions of the average error rate and outage probability for incremental cooperative relaying system are obtained, respectively, where per hop is independent and non-identically distributed. Finally, numerical and simulation results are shown to verify the accuracy of the analytical results. These results show that it is helpful to approxim