超级混沌系统的自由空间光通信信号加密研究

Study on signal encryption of free space optical Communication in super chaotic system

为实现自由空间光通信安全,保证通信内容的全面覆盖,研究超级混沌系统的自由空间光通信信号加密方法。采用基于差分混沌位移键控模型,划分自由空间光通信信号,形成参考信息段和信息承载段,经过光调制器的调制后实现信号的行扩频处理后,利用基于超级混沌序列信号3DArnold映射和Arnold变换,转换和置乱变换该处理后的信号,形成三维矩阵;依据该矩阵,基于超级混沌序列生成Frank序列矩阵,降低信号的峰值平均功率比,完成通信信号加密。测试结果显示:该方法随机性能良好,P-Value的结果均在0.1以上;加密后通信信号的频谱全部被混沌信号覆盖,具备良好的通信信号加密效果,信号的峰值平均功率比的结果大约下降1.9/dB,保证加密后通信的安全性,避免通信过程中传输的数据内容被窃取。

In order to realize the security of free space optical communication and ensure the comprehensive cover-age of communication content,the encryption method of free space optical communication signal for super chaotic sys-tem is studied.USES the model based on differential chaos shift keying,divided into free space optical communication signals,form the reference information and information carrier,after light modulator of modulation to realize spread spectrum signal line processing,based on the chaotic sequence signal 3 darnold mapping and Arnold transform,the processed signal conversion and scrambling transformation,form the three-dimensional matrix;According to this ma-trix,Frank sequence matrix is generated based on super chaotic sequence to reduce the peak average power ratio of signal and complete the encryption of communication signal.The test results show that the method has good random performance and p-value results are all above 0.1.After encryption,the spectrum of communication signals is covered by chaotic signals,which has good communication signal encryption effect.The peak average power ratio of the signal is reduced by about 1.9/dB,which ensures the security of encrypted communication and prevents the data content transmitted during communication from being stolen.