MAP- and Laurent-AMP-Based Carrier Synchronization in GMSK

An improved method of closed-loop synchronization of a radio receiver with the phase of a carrier signal modulated by Gaussian minimum-shift keying (GMSK) has been proposed. Synchronization of the receiver with the phase of the carrier signal ("carrier synchronization" for short) is necessary for coherent detection of the data modulation. The method could improve the performances of digital wireless communication systems - particularly European cellular systems, wherein GMSK is the standard form of modulation but efficient means of carrier synchronization for coherent detection have thus far been lacking.