Secure Communication Using WFRFT-DSSS Based on Chaotic Cyclic Shift

Space-air-ground-sea integrated communication is expected to be an important research direction in the future to meet the growing demand for efficiency, reliability and coverage. However, due to the open channel of wireless communication, the security of the communication network is facing great challenge. In this paper, a weighted fractional Fourier transform (WFRFT) direct sequence spread spectrum (DSSS) system based on chaotic cyclic shift is proposed. Specifically, a chaotic sequence is generated to control the cyclic shifts of the original spreading sequence and then the shifted sequences are encrypted through WFRFT before spreading the information bits. Simulation results demonstrate the practicability of chaotic cyclic shifted WFRFT (CCS-WFRFT) spreading sequence and the superior security performance of the proposed system.