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信道特性仿真是系统设计的重要组成部分,对信道估计、切换算法和功率控制等方面的分析与建模有重要意义。文中分析了LEO卫星移动信道的特点,研究了在不同的传播环境下信号经过卫星移动信道的统计特性,给出了能够反映LEO卫星移动信道实时特性的动态仿真模型。对经过该模型后信号的幅度特性和基于π/4DQPSK调制信号误码率特性进行仿真,仿真结果与实测数据相符,说明该模型能够反映信道的传播特性,可以用于LEO移动卫星通信系统的设计和研究。
The simulation of channel characteristics is an important part of the system design, which is of great significance to the analysis and modeling of channel estimation, handover algorithm and power control. In this paper, the characteristics of LEO satellite mobile channel are analyzed, the statistical characteristics of the signal traveling through the satellite in different propagation environments are studied, and the dynamic simulation model reflecting the real-time characteristics of LEO satellite mobile channel is given. Simulation results show that the model can reflect the propagation characteristics of the channel and can be used in the design of LEO mobile satellite communication system And research.