水声自适应混沌概率跳频通信方法研究

摘要

In order to improve reliability and security of underwater acoustic (UWA) frequency hopping (FH) communication system, a novel adaptive chaotic FH method is suggested. In this method, bit error rates (BER) of all FH channels are mapped into a probability density function (PDF) through a channel mapping function. Channel usage rates of all sub-frequencies are then distributed based on the mapped PDF. Random FH sequence, which meets the mapped PDF, is generated based on a chaotic key sequence and a specific random generator. FH pattern is produced by the random FH sequence, and is used by FH system. The simulation results show that compared with traditional chaotic FH and adaptive FH methods, the proposed method has lower BER, as demonstrated by simulations. Furthermore, it features higher security.%为了提高水声跳频系统的可靠性和保密性,提出了水声自适应混沌概率跳频通信新方法.该方法通过信道映射函数将各跳频信道的误码率映射成概率密度函数,依据此概率密度函数分配每个跳频频点的使用概率.根据混沌密钥序列和特定的随机数产生器产生满足此概率密度函数的随机跳频序列,并由此生成跳频图案,进行跳频通信.仿真结果表明该方法的误码率性能优于传统混沌跳频和传统自适应跳频方法,且具有更强的保密性.