超混沌序列的数字语音扩频调制研究

超混沌系统与普通混沌系统相比,产生的混沌序列有着更好的复杂性和类随机性,在保密通信中,具有很高的安全性。该文提出了把超混沌序列降维后应用于扩频通信的思想;设计了超混沌序列的降维模型,通过此降维模型生成了扩散均匀度较好的随机序列,对所设计的超混沌随机序列性能进行了深入分析,并对超混沌序列的语音扩频调制模型进行了实际仿真,验证了设计思路的正确性,为扩频保密通信技术的纵深研究提供了另外一条新的解决思路。

Research on Digital Sound Spreading-Frequency Modulation Based on Hyperchaos Sequence

Compared with ordinary chaos systems, hyperchaos systems have excellent security in communication because hyperchaos sequence has better complexity and randomicity. The thought of applying dimension-lowered hyperchaos sequence to spreading-frequency communication is proposed. A dimension-lowered model is designed to generate hyperchaos sequence with well-proportioned stochastic diffusion, then the capability of hyperchaos sequence is analyzed in defail. The sound spreading-frequency modulation model based on hyperchaos random sequence is tested by practical circuit experiments. Measuring results verify the validity of designing thought. Another idea is briefly introduced for the deep research into spreading-frequency secrecy communication technique.