In this letter, the weighted fractional Fourier transform (WFRFT) is performed on the chaotic sequence to enhance the security of the chaotic direct sequence spread spectrum (CD3S) communication, and a WFRFT-CD3S system that spreads the information bits through the WFRFT-chaotic sequence is proposed. In the proposed system, the transmitter scrambles the phase space trajectory of the chaotic sequence through WFRFT and make the distribution of the transmitted signal be Gaussian-like. The receiver synchronizes the WFRFT-chaotic sequence through bidirectional correlation search and demodulates the information through the synchronized local WFRFT-chaotic sequence. Simulations are implemented to evaluate the security performance, synchronization performance, and demodulation performance of the proposed system.

中文翻译：

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通过 WFRFT 增强混沌直接序列扩频通信的安全性

在这封信中，对混沌序列进行加权分数傅里叶变换（WFRFT）以增强混沌直接序列扩频（CD3S）通信的安全性，以及通过WFRFT-混沌扩展信息比特的WFRFT-CD3S系统提出顺序。在所提出的系统中，发射机通过 WFRFT 对混沌序列的相空间轨迹进行加扰，并使发射信号的分布呈高斯分布。接收端通过双向相关搜索同步WFRFT-混沌序列，并通过同步的本地WFRFT-混沌序列解调信息。实施仿真以评估所提出系统的安全性能、同步性能和解调性能。