相空间混沌扩频通信及其误码率

为了提高扩频通信系统中数据传输的可靠性,研究相空间混沌信号产生混沌序列扩频码对扩频系统误码率的影响。测试不同混沌序列的李雅普诺夫指数验证混沌系统,将统计自相关和互相关特性作为刻画扩频码序列性能的重要指标,测试并分析各扩频序列的统计相关特性,最后通过仿真实验获取各扩频码的误码率,并将其误码率与对应统计相关特性作对比揭示其内在关联性。仿真实验表明相空间混沌信号所产生扩频码序列比经典Logistic映射所产生扩频码序列能获得更低的误码率,尤其是空时混沌信号所产生混沌序列更有利于扩频通信需要。

Phase space chaotic spread spectrum communication and its error rate

In order to improve the reliability of data transmission in the spread spectrum communication system,the impact of bit error rate on the spread spectrum system caused by the influence of the different chaotic sequence spreading codes,which are generated by the phase space chaotic signals in the spread spectrum system,is discussed.Firstly,the Lyapunov exponents of different chaotic sequences are tested to verify each system to be a chaotic system at that time.Secondly,the statistical autocorrelation and cross-correlation characteristics of each chaotic sequence are taken as an important index to measure the performance of spreading code sequence,and the statistical correlated characteristics of each spreading sequence are tested and analyzed.Lastly,the intrinsic correlation of the bit error rate of each spreading code which is obtained by simulation experiment and its corresponding statistical correlated characteristics is revealed at that time.Simulation experiment shows that the bit error rate of spreading code sequence generated by the phase space chaotic signals is lower than that of spreading code sequence generated by the classical Logistic mapping,and especially,the chaotic sequence generated by space time chaotic signal is more conducive to the needs of the spread spectrum communication system.