一种新的混沌扩频序列的研究与应用

The study and application of a new chaotic spreading spectrum sequences

在分析目前被广泛研究的Logistic映射的基础上,提出了一种复合混沌序列生成方案.该序列由两个不同初始值的两个Logistic映射复合而成,具有较高的安全性.对复合混沌序列初值敏感性、平衡性、自相关性、功率谱密度进行了分析,研究结果表明这种新型的序列具有较高的初值敏感性,优良的平衡性、自相关性和伪随机性.对该序列在直接扩频系统中的应用进行了研究.结果表明复合混沌扩频序列是一种有效的和可靠的扩频序列.

In this paper, a new compound chaotic sequences production plan is proposed based on the analyzed of the theory of Logistic map. We adopt methods of two Logistic chaotic sequence subtractions, yielding the compound chaotic sequences. The new compound chaotic sequences easily to realize and more secure for communication. The sensitivity to initial conditions properties, auto correlation proper- ties and power spectral density of the new sequences are analyzed. It is indicated that the new sequences sensitivity to initial conditions, have better autocorrelation characters and excellent pseudo randomness. A practical spread spectrum scheme is simulated in this paper, which based on the new-style chaos se- quences. Simulation results show the effectiveness and reliable of the new-style chaos sequences.