任意时域相关Nakagami复衰落模型

摘要

Traditional Nakagami fading models can not provide satisfactory temporal correlation. Based on channel decomposition technique and sum-of-sinusoids (SOS) method, a novel complex Nakagami fading channel simulator is proposed. The new model allows arbitrary fading parameter and prespecified temporal correlation. Firstly, the relationships between Rayleigh and Nakagami random process is derived. Presented a modified Nakagami envelope decomposition model by Rayleigh processes is then presented. Finally, arbitrary temporal correlated Nakagami fadings are generated combining with SOS method. Simulation results verify that the output channel of new model has more accurate autocorrelation coefficient than other models, and the statistical properties, including envelope and phase distributions, are also very close to the theoretical results.%针对传统Nakagami仿真模型难以提供精确时域自相关性问题,提出一种基于信道分解技术和谐波叠加方法的Nakagami复衰落仿真模型,该模型适用于任意衰落参数且可指定时域自相关性.文中首先推导了瑞利和Nakagami随机过程包络及自相关性的内在联系,然后给出Nakagami包络的瑞利分解改进模型,最后结合谐波叠加方法产生任意时域相关的Nakagami复衰落信道.仿真结果表明,新模型输出信道时域自相关系数更精确,包络相位分布等其他统计特性均与理论结果一致.