基于α稳定分布的短波宽带信道模拟器实现

Implementation of the HF Wideband Channel Simulator Based on α Stable Distribution

针对现有短波信道模拟器在FPGA实现时存在占用资源多,计算量大的问题,采用α稳定分布的方法实现多普勒频率扩展,提出采用查表实现各个模块。仿真结果表明,模拟器消耗的资源大幅度减少,证明了有效性。且模拟器产生的信道衰落分布与理论值吻合,模拟器设计值与设置的信道时延,多普勒效应基本一致,误差为0.39%,证明了其准确性,可高效准确地用于模拟短波电离层对信号的影响。

The implementation of existing HF channel simulator based on the FPGA suffers intensive computa- tion and occupies many resources. The α stable distribution method is employed for doppler spread with each module realized by the look-up table method. The experimental results show a significant decrease in the occupied resource of the simulator. The theoretical distribution agrees with the output of fading envelope distribution and the designed val- ues of the simulator are close to the measured channel delay and doppler effect with an average relative difference of 0. 39%. The simulator is applicable in the accurate and efficient simulation of the HF ionosphere effect on the sig- nals.