一种仿真瑞利信道的有效方法

改进了一种基于正弦和的仿真瑞利信道的方法,消除了它生成的复随机过程的同相和正交分量的概率密度函数及该复随机过程的包络平方的自相关函数是广义非平稳的缺点. 运用改进后的方法生成的复随机过程的自相关函数,及其同相和正交分量的自相关函数、互相关函数也与理论参考值相等. 仿真结果表明,改进后的方法生成的复随机过程的幅度、相位的概率密度函数及平均电平通过率、平均衰落持续时间能更好地逼近理论参考值.

An efficient simulation method for Rayleigh channels

In this paper, a modified sum-of-sinusoids statistical simulation method is proposed for Rayleigh channels. In some well-known methods, there exist problems that the probabiltiy density function (pdf) of the quadrature components and the squared envelope autocorrelation are nonstationary. It shows that the modified method can eliminate the above problems. It is proved in theory that the autocorrelations and cross correlations of the quadrature components and the autocorrelation of the complex envelope of the modified simulators match the desired ones exactly. Moreover, simulation results show that it has a better performance in terms of the probability density functions of the envelope and phase, the level crossing rate, and the average fade duration than the previous methods.