一种改进的混沌直扩方案

An Improved Solution for Chaotic Direct Spread Spectrum System

直接序列扩频是低截获概率通信常用的通信技术。传统的扩频技术受到自身扩频码性能的限制,抗截获性能不高。近年来被广泛研究的混沌扩频技术能改善传统扩频通信的一些缺陷,但新的截获技术迫使我们寻找具有更高抗截获性能的通信技术。基于混沌扩频,提出了一种改进的直扩通信方案——变速混沌扩频,包括两种变速方法。通过仿真和分析,证明了变速混沌扩频适合于直扩通信系统。同时,理论分析表明,与传统混沌直扩系统相比,该方案具有更好的抗截获性能。

DSSS （Direct Sequence Spread Spectrum） is usually used as the communication technology for low-interception-probability communication. The traditional SS （Spread Spectrum） technology is limited by the PN code performance, and this would result in its poor anti-interception performance. Chaotic spread spectrum technology is extensively studied in recent years and and this technology could remedy some defects of the traditional spread spectrum. However the newly-occurred interception technology forces the people to look for a communication technology with better anti-intercept performance. A variable speed chaotic spread spectrum method based on chaotic spread spectrum and with two speed-raring ways is proposed. Simulation and analysis show that the variable speed chaotic spread spectrum sequences is applicable to DSSS system. The theoretical analysis indicates that this solution is of better LPI performance as compared with traditional chaotic DSSS system.