Weak BPSK signal demodulation by chaotic synchronization method

In this paper a new method for low SNR (signal-to-noise ratio) BPSK (Binary Phase Shift Keying) signal demodulation is proposed. This method can be divided into two steps. The first one is to recover BPSK waveform from Additive White Gaussian Noise (AWGN) with high mean power, based on speed gradient algorithm and master-slave Duffing´s systems. The second one is to demodulate the BPSK signal which has been recovered by the first step, based on traditional coherent demodulation method. And after analysis and simulation, we can find the new method can demodulate lower SNR signals than traditional methods with good performance.