摘要
分析了混沌伪随机序列的自相关和互相关特性,采用Logistic序列作为扩频序列应用到多用户DS-CD- MA系统中。分析了不同用户数下多用户干扰对系统BER的影响,并与M序列扩频系统进行了比较。计算机仿真表明,混沌伪随机序列具有优良的自相关和互相关特性,和传统的M序列相比,采用混沌扩频序列,可以大大降低系统的多用户干扰.使得系统的BER性能有大幅改善。
The auto-correlation and cross-correlation characteristic of chaotic pseudo random sequences is investigated. Logistic spread spectrum sequences are adopted to multi-user DS-CDMA systems, The effect of multi-user interference to system BER under different number of users is investigated, and is compared to the scenario which adopts m sequences. Computer simulation shows that chaotic pseudo random sequences have excellent auto-correlation and cross-correlation characteristic, By adopting chaos spread spectrum sequences, the multi-user interference is greatly degraded, and the performance of system BER is greatly improved.
出处
《中国新通信》
2008年第5期25-28,共4页
China New Telecommunications
