一种基于跳频的散射通信新方法与仿真分析

A new method of troposcatter communication based on frequency hopping and simulation analysis

针对对流层散射通信信道多径衰落特性,提出一种基于跳频的抗衰落方法,通过建立基于跳频的散射通信模型,对该方法在衰落信道下的性能进行理论分析,并给出其接收信号基带处理算法流程,采用基于跳频帧结构的帧粗同步及基于信道响应搜索的帧细同步算法,解决衰落信道下的帧同步问题,采用基于信道去噪估计与混叠抽取的频域均衡算法,有效克服信道多径,并抑制噪声放大。仿真结果验证了该方法性能理论分析的正确性以及有效性。

In this paper,a novel anti-fading method based on frequency hopping is proposed to solve the problem of multipath fading characteristics of troposcatter communication channels. The troposcatter communication model based on frequency hopping is established and the performance of this method is theoretically analyzed in fading channel. The algorithm flow of its received baseband signal processing is given. The frame coarse synchronization algorithm based on frequency hopping frame structure and the frame fine synchronization algorithm based on channel response search are adopted to solve frame synchronization problem in fading channel. The frequency domain equalization algorithm based on channel de-noising estimation and aliasing extraction is adopted to overcome channel multipath effectively and suppress noise amplification. Simulation results verify the validity and effectiveness of the proposed method.