Carrier Detection Method of Binary-Phase-Shift-Keyed and Direct-Sequence-Spread-Spectrum Signals Based on Duffing Oscillator

In this paper, carrier detection scheme of binary-phase-shift-keyed and direct-sequence-spread-spectrum (DSSS/BPSK) signals based on Duffing chaotic oscillator is presented. Technique of Duffing oscillator weak signal detection is introduced first. Then by making use of Duffing oscillator's sensibility to small periodic signals and immunity against noise, the sine signal is detected which derives from square transform of DSSS/BPSK signal and is submerged in strong noise. The results of simulation show that DSSS/BPSK signal at SNR=-38.35 dB can be detected by the presented method here