基于Watterson模型的HF信道模拟器设计与实现

基于Watterson信道模型确定了一种短波信道模拟器实现方案,给出了多径延时、多普勒频移、多普勒频扩和噪声等关键参数的仿真算法,进而采用软硬件结合、软件编程为主的方法,利用DSP芯片及相关外围器件,实现了一种话音带宽短波信道模拟器。实验结果表明,该模拟器性能达到了预期要求,能够实时模拟窄带信道条件下的短波信道。该模拟器作为一个功能模块,嵌入某型短波调制解调器中,为设备调试及现场自测试提供了一种有效手段。

The Design and Implementation of HF Channel Simulator Based on Watterson Model

A design scheme of HF channel simulator is proposed on the basis of detailed analysis on Watterson model, and the simulation algorithms of the related key parameters including multipath delay, Doppler frequency shift, Doppler frequency spread and noise, etc., are discussed as well. Relaying on a DSP and its peripheral circuit, a HF channel simulator with voice bandwidth has been implemented, by the method of combining software and hardware, but mainly by software programming. Experimental results show that the proposed simulator can real-timely simulate the shortwave channel of narrowband, which has reached the anticipated requirements. The simulator as a functional module, embedded in a certain type of shortwave modem, the device provides an effective means of debugging.