时间演进非平稳莱斯衰落信道建模及产生方法

Modeling and Generation of Non-stationary Rice Fading Channel with Time Evolution

针对基站-移动台之间的动态传播场景,构建一个时间演进的非平稳莱斯衰落信道模型,提出了一种基于线性调频信号叠加的产生方法,并给出模型参数的计算及更新算法.实验表明,该方法不仅可以保证衰落信道状态的平滑切换及衰落信道幅值和相位的连续性,还能复现衰落信道的非平稳特性,从而保证信道模型输出的时变包络分布和时变多普勒功率谱与期望值一致.该方法可用于时变场景下移动通信系统的性能评估和验证.

When the transmitter or receiver moves fast,wireless radio channel for mobile communication system is non-stationary.This paper establishes a non-stationary Rice fading channel model with time evolution for the dynamic propagation link between mobile and base stations.A generation method is proposed for non-stationary fading channels based on the sum-of-linear-frequency-modulation（So LFM） signals,and an algorithm for parameter updating designed.Experimental results show that the proposed method can ensure smooth handoff of fading channel states and continuity of fading amplitude and phase.It can also reproduce non-stationarity of a fading channel,and ensure the channel model＇s time-variant envelope distribution and time-variant Doppler power spectrum agree with the desired values.The model and its generation method can be applied to evaluate performance and validate a wireless mobile system in a time-variant propagation environment.