用于信息传输安全的混沌编码调制跳变技术

为提高信息传输的安全性，基于信息熵和混沌编码提出了一种可用于调制方式加密的通信技术。该技术可以根据对实时信道信噪比的估计自适应地选择多种高抗噪性能的调制方式，并利用经过混沌加密的调制跳变提高信号传输的保密性能。通过仿真实验，用时变信道和7 种常用的调制方式，以及混沌的Logistic 映射实现了该技术，并证实了其有效性。

Modulation-Hopping Technique for Information Transmission Security Based on Chaotic Coding#br#

In order to increase the information security in information transmission，A communication technique based on information entropy and chaotic coding is proposed for modulation encryption． Theoretically，this technique chooses modulation methods adaptively for the signal with low bit error rate in accordance with realtime SNＲ ( Signal-Noise-Ｒatio ) estimation． It also increases the information security performance of the modulated signal by switching one modulation method to another according to the chaotic cipher codes．Numerically，an experimental implementation using time-variant channel，7 modulation methods and the chaotic Logistic map，demonstrates the validity and effectiveness of this technique．