A new decision-feedback DPSK receiver with blind phase prediction

A new receiver based on decision feedback and linear prediction principles is proposed for the coherent detection of PSK signals in fading channel. This receiver uses the previously detected symbols to estimate the previous channel gains and then uses these estimated channel gains to predict the channel gain continuously, and therefore makes the optimal coherent detection of DPSK. The receiver has a simple structure and can be implemented easily. Simulations of the bit error (BER) performance of QDPSK with the new receiver in both additive white Gaussian noise (AWGN) and Rayleigh flat-fading channels are given. The results show that the proposed receiver provides almost the same BER performance as the ideal coherent receiver in an AWGN channel, is very robust against large carrier frequency offset between the transmitter and receiver, and can provide a reasonably good BER performance in a fast Rayleigh fading channel. Moreover, the fact that the receiver is “blind” leads to a simpler implementation, since there is no need to estimate the fading parameters