混合混沌多进制扩频系统的蒙特卡罗分析

Monte Carlo Analysis of Mixed Chaotic M-ary Direct Sequence Spread Spectrum System

多进制扩频可以很好地提高通信抗干扰能力,但是其要求扩频码的数量要足够多,针对这一问题,提出了采用混沌映射序列的多进制扩频抗干扰方法.针对单个低维混沌映射产生的混沌序列存在抗攻击能力差、密钥空间小、保密性不理想等缺点,产生了新的混合混沌序列,并且和基于m序列、Gold序列的传统直接扩展频谱系统的抗干扰能力进行对比.仿真结果表明,混合混沌多进制扩频系统具有很好的抗干扰性(16进制混合混沌序列扩频系统抗干扰能力比传统直扩系统优10dB),且其解决了传统序列数量不足的问题.

M-ary direct sequence spread spectrum（DSSS） system does well in improving anti- jamming ability of communication, but it puts forward higher requirements to the spread spectrum code number. In order to solve this problem, M-ary DSSS anti-jamming scheme with chaotic mapping sequence was proposed. However, the chaotic sequence of single low- dimensional chaotic mapping has some shortcomings in terms of anti attack ability, key space and security. A new mixed chaotic sequence was presented, and the anti-jamming performance with traditional direct sequence spread spectrum system based on rn sequence and Gold sequence was compared. Results of performance analysis and simulation indicate that the mixed chaotic M-ary DSSS system has strong anti-jamming（the anti-jamming ability of the 16-ary mixed chaotic direct sequence spread spectrum systems is 10 dB better than traditional DSSS systems）, and can meet the requirement for spread spectrum code number.