Effective DSP Methods of PSK Feedback Timing Synchronization

Abstract. This paper deals with simplification and im-provement of data timing synchronization algorithms. Timing error synchronizers are usually the most compli-cated subsystems in the demodulator, and limit the DSP technique used for the high-rate application. This article is focused on feedback timing estimators for PSK modulation schemes, and shows modifications of widely used algo-rithms, that are suitable for the DSP implementation, as well as reach better parameters of the detection process. The methods applied in the evaluation of a timing error detector, which is a crucial part of the synchronizer, are described in the last part. Keywords Additive white Gaussian noise, delay lock loop, digital signal processing, early-late detector, ML criterion, Mueller-Mueller detector, normalized timing error variance, phase shift keying, timing synchronization, timing error detector, raised-cosine pulse shaping, zero-crossing detector. 1