Systems and Methods for Adjusting the Sample Timing of a GFSK Modulated Signal

A gaussian frequency shift keying “GFSK” detector comprising:

• a multi-symbol detector configured to:
• receive a series of samples representing a received GFSK modulated signal, the series of samples comprising at least three samples per symbol of the GFSK modulated signal, and
• generate, for each set of samples representing an N-symbol sequence of the GFSK modulated signal, at least three sets of soft decisions values, each set of soft decision values indicating the probability that the N-symbol sequence of samples is each possible N-symbol pattern based on a different one of the at least three samples of a symbol being a centre sample of the symbol, wherein N is an integer greater than or equal to two;
• at least three Viterbi decoders, each Viterbi decoder configured to generate, for each N-symbol sequence, a path metric for each possible N-symbol pattern from a different set of soft decision values according to a Viterbi decoding algorithm;
• and
• a timing adjustment module configured to generate a timing adjustment signal based on the path metrics generated by the at least three Viterbi decoders to cause timing of the sampling of the GFSK modulated signal to be adjusted.