基于谐波叠加的短波信道模拟器设计

Design of High-Frequency Radio Channel Simulator based on Sum of Sinusoids

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 High Frequency radio channel simulator based on Watterson model,filter method is usually used in the realization of channel fading and doppler frequency spread,and bowever,this methold is of high computing complexity.This paper proposes a new method with low complexity,which employs sum-of-sinusoids and design the tap-gain functions and simulate Doppler frequency spread and fading,thus lowering the computing complexity.Finally,a single-tone signal is adopted to simulate the characters of multi-path,Doppler frequency shift and spread in HF channel model.The simulation results indicate that the sum-of-sinusoids method is available in the design of HF channel simulator.