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针对传统扩频码序列存在复杂度低、抗攻击性差等问题,提出一种基于复合多涡卷Jerk-chua混沌吸引子的扩频码构造方法。该方法通过均匀映射产生初始伪随机序列,再与随机短序列复合后重复迭代,从而得到新的扩频序列,该新扩频序列的长度随迭代次数成几何级数增加。通过性能分析,该序列的平衡性得到了很大的改善,复杂度得到了很大的提高。仿真实验表明:所提出的扩频码序列较传统方法在抗多径干扰能力、可承载的用户数和扩频误码率等方面具有更好的效果。
Aiming at the problems of low complexity and poor anti-attack performance of traditional spread spectrum sequences, a method of constructing spread spectrum codes based on complex multi-scroll Jerk-chua chaotic attractors is proposed. In this method, the initial pseudo-random sequence is generated by uniform mapping and then repeated with the short random sequence to obtain a new spreading sequence. The length of the new spreading sequence increases geometrically with the number of iterations. Through the performance analysis, the balance of the sequence has been greatly improved, the complexity has been greatly improved. The simulation results show that the proposed spreading code sequence is more effective than traditional methods in anti-multipath interference capability, the number of users that can be carried and the bit error rate of spread spectrum.