基于混沌与自编码相融合扩频码的构造

为了提高扩频通信系统数据传输的有效性和安全性，提出了一种混沌映射与自编码非线性融合的思想构造扩频码方法。该方法首先将Logistic混沌序列通过改进产生的复合符号混沌序列与自编码算法输出反馈进行逻辑异或，然后与自编码序列经非线性Henon映射相融合产生高质量的复合扩频码。以混沌和自编码为基础分析了该方法的有效性，并与现有方法进行比较，提高了序列的相关性和复杂度。在DS-CDMA系统中进行仿真验证，结果表明该方法产生的扩频序列抗多径干扰能力更好，并能获得较低的扩频误码率，有利于扩频通信的需要。

Construction of spreading code based on nonlinear fusion of chaotic mapping and self-coded method

In order to improve the effectiveness and reliability of data transmission in spread spectrum communication system, a spread spectrum code which is constructed by the nonlinear fusion of chaotic mapping and self-coded method is proposed. Firstly, it generates a compound symbol sequence through a Logistic chaotic sequence to obtain a xor operator with the feedback of self-coded output, and then to get a high quality compound spread spectrum code by the nonlinear Henon mapping fusion with self-coded sequence. The effectiveness of the method is analyzed based on chaos and self-coded sequence. Compared with existing methods, this algorithm improves the correlation and complexity of the sequence. And simulation in DS-CDMA system shows the method of generating spread spectrum sequence has a better ability of anti-multipath interference, and obtains a lower bit error rate of spread spectrum, which is conducive to the needs of the spread spectrum communication.