关键词: 扩频通信,三元组扩频码,均匀映射,误码率,蒙特卡罗模型

Abstract: In order to produce,work out a set of signal with approximate white Gaussian noise statistical characteristics,and use it as the spread code to reduce the error rate and improve reliability for the spread spectrum communication system,a novel spread code based on the ternary random sequence was presented．It takes the initial random dynamic ele-ment as the initial value,and a multi-round reconstruction method is designed to pretreat a background before using some methods such as periodic orbit-changed,control space mapping and constraint judgment to realize the discrete trajectory transform,what’s more,it is producted by uniform mapping．With different SNR and sinusoidal interference,ternary spread sequence’s BER was simulated and analyzed as the spread code based on Monte Carlo,so well as m sequence’s,piecewise logistic chaotic’s and linear congruence pseudorandom sequence．Experimental results demonstrate that ternary spread sequence has lower BER,and it ensures system stability under low signal-to-noise ratio,severes channel attenuation and strong interferences． It could improve anti-intercept ability and anti-jamming ability,and thus guarantee the reliability in spread spectrum communication system．

Key words: Spread spectrum communication,Ternary spread code,Uniform mapping,BER,Monte Carlo model