差分跳频接收机信号抗干扰性能研究

Performance Analysis of Antijamming in Normalized Noise DFH Receiver

由于接收机差分跳频通信系统的主要干扰是部分频带干扰和多音干扰,造成信道误差大。为了提高差分跳频系统的抗干扰性能,首先采用了噪声归一化合并差分跳频接收机模型,分析了瑞利衰落信道中,部分频带干扰下系统的误符号性能。然后给出了不同接收方式下的差分跳频系统抗干扰性能的仿真。仿真结果表明,噪声归一化合并差分跳频接收机的抗部分频带干扰性能优于乘积合并差分跳频接收机。在最坏的全频带干扰情况下,接收机仍然能够在很大的信干比区间内大幅优于乘积合并差分跳频接收机。随着干扰带宽变窄,系统性能优势更为显著。

What the main interference of DFH system facing is partial band interference and multi - tone interference. In order to improve the anti - jamming performance of DFH system, this paper first used a noise normalized consolidated DFH receiver model, and analysed the symbol error performance of partial - band interference under Rayleigh fading channel. Then the simulation of DFH system jamming performance for different receiving mode was provided. Simulation results show that the combined noise normalized DFH receiver partial band anti - interference performance is better than the product of the merger of DFH receiver. In the worst case, that is the whole band inter- ference, the receiver is able to dry in large letters significantly better than the product of the merger ratio DFH receivers within range. With the interference bandwidth narrowing, system performance advantage is more significant.