Data-aided linear prediction receiver for coherent DPSK and CPM transmitted over Rayleigh flat-fading channels

In this paper, a new data-aided linear prediction receiver for coherent dif ferentially encoded phase-shift keying (DPSK) and coherent continuous phase modulation (CPM) over Rayleigh flat-fading channels is presented. This rec eiver uses the previously detected symbols to estimate the carrier-phase re ference and predict the channel gain continuously and therefore makes the o ptimal coherent detection of DPSK and CPM. The receiver has a simple struct ure and can be implemented easily. This is due partly to the fact that the linear predictors used for channel estimation do not depend on the autocorr elation function of the fading process. Simulation results on the bit error performance of QDPSK and minimum-shift keying (MSK) with the new receiver are given for both the additive white Gaussian noise (AWGN) and the Rayleig h flat-fading channels. The results show that the proposed receiver provide s almost the same bit error rate (BER) performance as the ideal coherent re ceiver in an AWGN channel, is very robust against large carrier frequency o ffset between transmitter and receiver, and can provide a reasonably good B ER performance in a fast Rayleigh fading channel. Finally, a multisample re ceiver is discussed and its error rate performance is evaluated by means of computer simulations. The results show that the multisample receiver provi des good BER performance for higher fading rate.