Non-coherent Differential Demodulation of PSK

A non-coherent differential demodulation method is presented.The frequency deviation is translated into the phase deviation of the dot product and cross product,and the timing clock is recovered from the square of the signal envelope.Thus the demodulation method is not sensitive to frequency drift.The demodulation formula is deduced,and the structure of the demodulator given.Based on theoretical analysis,the threshold of the anti-frequency deviation capability is achieved.Finally,the simulation model is built and the four modulations,including BPSK,DPSK,QPSK and DQPSK,are simulated.The simulation results shows that the demodulation method is correct and effective.