基于优选准则的混合混沌序列的生成

针对传统的m序列、Gold序列可用作扩频码的数量有限这一问题,提出了用混沌序列代替传统的m序列、Gold序列的方法。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,依据优选结果将单个低维的改进型Logistic序列与Chebyshev序列组合产生了一种新的混合序列。仿真结果表明,新的混合混沌序列平衡性高、类随机、相关性好,且该混合混沌序列和m序列、Gold序列的抗AWGN干扰和抗单频干扰的能力相近。

Generation of Mixed Chaotic Sequences Based on Optimization Criterion

The number of traditional m sequence with and Gold sequence which can be used as spreading codes is limited.In order to solve this problem,using chaotic sequence instead of m sequence and Gold 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.According to the optimization results,this paper presented a new mixed chaotic sequence by the combination of the single low-dimensional Logistic sequences and Chebyshev sequences.Results of performance analysis and simulation indicate that the new chaotic sequence does well in balance,random and correlation,and the anti-jamming ability of mixed chaotic sequences,m sequence and Gold sequence is similar.