MULTIPLE-SYMBOL DIFFERENTIAL DETECTION OF GMSK FOR MOBILE COMMUNICATIONS

In this paper, a new multiple differential detection (MDD) sequence es timator is described which uses a decision feedback for the demodulati on of a GMSK signal. This technique is based upon a maximum-likelihood sequence estimation of the transmitted phases rather than on a symbol -by-symbol detection, An upper and a lower bound on the bit error prob ability of the described detector in the case of an AWGN channel and a two-way Rayleigh fading channel are derived, The performance of the d etection algorithm in a mobile radio communication system is obtained through computer simulation. Comparisons with the coherent detection a lgorithm show that the proposed detection algorithm is quite attractiv e both in an AWGN and in a multipath channel.