移动衰减信道确定性的仿真模型

Deterministic Simulation Model for Mobile Fading Channel

莱斯的正弦信号总和可以有效地近似高斯色噪声过程 ,对移动衰减信道模型的软硬件认识极为重要。主要对仿真模型的幅度和相位的概率密度函数进行了研究。由于仿真模型的确定性 ,可以求出幅度和相位的概率密度函数、自相关函数、互相关函数。对于给定多普勒功率谱特性的高斯、瑞利、莱斯过程 ,提出了用一定数量的正弦信号来近似的优化办法。

Rice's sum of sinusoids can be used for an efficient approximation of colored Gaussian noise processes and is therefore of great importance to the software and hardware realization of mobile fading channel model. In this paper, the authors investigate the simulation model's amplitude and phase probability density function(pdf).It shows that due to the deterministic nature of the simulation model, analytical expressions for the pdf of amplitude and phase,autocorrelation function(acf), cross correlation function(ccf)can be derived. The authors also propose a new procedure for the determination of an optimal set of sinusoids,i.e,the method for a given number of sinusoids in an optimal approximation of Gaussian, Rayleigh and Rice processes with given Doppler power spectral density(psd)properties.