NONLINEAR EQUALIZATION FOR INCOHERENT RADIOMOBILE CHANNEL

This paper presents the simulation study of a multiple-symbols differe ntial demodulator for Gaussian Minimum Shift Keying (GMSK) which compe nsates for the heavy selective distortions caused by multipath propaga tion. The receiver includes a channel estimator operating in a trainin g mode at the beginning of each burst, and a multiple-symbols differen tial processor which has been demonstrated in the literature to be opt imum over non-coherent AWGN channels. The combination of channel estim ation and differential demodulation makes the receiver robust to fast Doppler shifts and to wide time-spread. Simulation results are present ed which show the performance in different multipath environments base d on the recommendations established by the GSM system. Comparisons wi th a coherent receiver including a matched filter, an adaptive channel estimator and a Viterbi processor show that the detector proposed in this correspondence is quite attractive.