由于部分频带干扰对跳频通信系统危害最为严重,而自适应性的引入将大大改善跳频系统的抗干扰能力。文中在常规跳频系统的基础上给出了一种自适应跳频系统,通过介绍自适应跳频系统原理,引入了双态信道模型,分析了在部分频带干扰条件下系统的误码率。在Matlab平台上对文中所给系统的性能进行仿真,并与常规跳频系统进行对比。仿真结果表明该系统能够自适应的去除干扰频点,调整跳频图案,从而使得抗干扰性能得以改善。在阻塞率为0.2时,自适应跳频系统的误码率仅为常规系统的百分之一,能够有效抵抗部分频带干扰的影响。

The adaptive frequency-hopping system has good anti jamming capabilities, so it's increasingly used in short-wave com-munication. In the thesis, firstly, it introduces the AFH, which is basis of conventional FH, and analyses BER under the partial-band noise jamming. Secondly, it simulates the AFH system on the Matlab platform and compares the result with conventional FH's. It's easy to see that the AFH system can remove the frequency interference and adjust FH patterns to improve the capabili-ties of the anti jamming. Especially, when the blocking rate is 0.2, the BER of the AFH system is only the one percent of conven-tional FH's, in other words, its anti-jamming capabilities is efficacious.