摘要
通过lyapunov函数法构造了统一混沌系统同步的接收系统的通用数学模型.以lorenz和chen混沌同步系统为例,以lorenz产生的3个变量作为调制波,用chen产生的3个变量作为解调波,将此同步系统应用在扩频通信中.本文用一种新的混沌级联方式来产生扩频通信所需要的PN码,分析了该码的平衡性,相关性.研究了信噪比,用户数量和序列长度对系统误码率的影响,通过仿真表明这种方式产生的PN码性能优于传统的扩频码.
The general mathematical model of the synchronic receiving system of the unified chaotic system is constructed by the method of lyapunov function.The synchronic system is applied to spread spectrum communication by taking lorenz and chen chaotic synchronization as the example of,by taking three variables generated by lorenz as the modulation wave,by taking three variables generated by chen as the demodulation wave.Meantime,PN code required by spread spectrum communication is generated by a new chaotic cascade way and the balance and relevance of the code are analyzed.SNR and sequence resource and sequence length effected on BER of system are also researched.The simulation shows that the PN code generated in this way is better than the conventional spreading code.
出处
《河北工业大学学报》
CAS
北大核心
2012年第4期1-4,共4页
Journal of Hebei University of Technology
基金
河北省科技厅科技支撑项目(10213554)
河北省教育厅项目(Z2010234)
廊坊市科技支撑项目(2011011038)
关键词
级联混沌
混沌序列
扩频通信
同步
cascading chaos
chaotic sequence
spread spectrum communication
synchronization
