Timing recovery for digital demodulation

摘要

A method of demodulating an oversampled digitised analogue signal F(t) wherein n samples per bit of the digitised signal represent the instantaneous frequency and/or phase of the signal. The method includes the steps of selecting a sequence of bits containing bit value transitions, determining the magnitude of F(t) within the sequence so that all the extrema are maxima (or minima), whereby the maxima (or minima) of |F(t)| provide a defined timing position in relation to the bits of the sequence. The value of |F(t)| over a succession of said bits is averaged and a timing control signal is derived therefrom for demodulation of the digitised analogue signal.