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本文在文献[1]的基础上,研究多径衰落信道条件下采用无先导卡尔曼滤波混沌拟合对混沌直扩通信的可破解性.由针对混沌直扩信号的无先导卡尔曼滤波混沌拟合的状态空间方程出发,分析了多径衰落信道对于无先导卡尔曼滤波混沌拟合过程中的跟踪误差的影响,得到了信息码状态估计的值域范围,从而提出了多径衰落信道下混沌直扩信号可被破解的充分条件定理.仿真结果表明,在满足充分条件下,混沌直扩信号无论是通过时不变信道还是时变信道,都可以被成功破解,并且具有良好的误码率性能.
Based on the literature [1], this paper studies the crackability of chaotic direct-expand communication using chaotic fitting without pre-emptive Kalman filter under multi-path fading channel conditions.First, the chaotic quasi-chaotic Based on the state-space equation, the influence of multipath fading channels on the tracking error in the chaotic fitting without pilot Kalman filter is analyzed. The range of the state estimation of the information codes is obtained, and the chaos in multi-path fading channels The sufficient condition theorem for the DS signal to be cracked is given. The simulation results show that the chaotic DSSS signal can be successfully cracked and has a good bit error rate (BER) under sufficient conditions performance.