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在基于Watterson模型的短波信道模拟器设计中,常采用滤波法实现短波信道的多普勒扩展和衰落,其运算复杂度较高。给出一种新的短波信道模拟器实现方法,采用谐波叠加法设计抽头增益函数,模拟短波信道的多普勒扩展和衰落,有效降低了运算复杂度。最后,采用单音信号对信道模拟器多径?多普勒扩展和多普勒频移等性能进行了仿真,仿真结果证明了用谐波叠加法设计短波信道模拟器的有效性。
In the design of short-wave channel simulator based on Watterson model, the Doppler propagation and fading of short-wave channel are often adopted by the filtering method, and the computational complexity is high. A new implementation method of shortwave channel simulator is given. The tap gain function is designed by the harmonic superposition method to simulate the Doppler spread and fading of the shortwave channel, which effectively reduces the computational complexity. Finally, the multi-path Doppler spread and Doppler shift of the channel simulator are simulated by using single tone signal. The simulation results show the effectiveness of the HF channel simulator with harmonic superposition.