Multiple-symbols differential detection of GMSK

A new differential detection algorithm using multiple-symbol observation interval for the demodulation of a GMSK signal is described. This technique is based on a maximum-likelihood sequence estimation of the transmitted phases rather than symbol-by-symbol detection. Upper and lower bounds on the bit error probability of the described detector in the case of an AWGN channel are derived. Comparisons with the classical coherent detection algorithm of a CPM signal show that the proposed detection algorithm is quite attractive.