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 analysis of incremental cooperative relaying system over composite multipath/shadowing fading channels

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的问题,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的误码率和中断性能,数值和仿真分析验证了理论分析的正确性。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的性能研究。

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 approximate the composite NL distribution by using the MG distribution in the performance analysis of cooperative relaying systems.