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A receiver as claimed in claim 1, characterised in that the integrating means comprises a digital moving averaging means.Ħ.

A receiver as claimed in claim 1, characterised by means for wrapping output samples of the integrating means, said wrapped samples being supplied to said converting means.ĥ. A receiver as claimed in claim 1, characterised in that each of the log 2 M additively combined outputs are used directly as soft decisions for further forward error correction processing.Ĥ. A receiver as claimed in claim 1, characterised in that at least one threshold circuit is coupled to the additive combining means to provide a hard bit decision for each of the log 2 M outputs.ģ. An M-ary FSK receiver comprising means for frequency demodulating a modulated signal, means for estimating the rate of change in the demodulated signal, means for deriving N estimates of phase change per symbol, where N has a value of at least 2, by integrating the estimated rate of change over respective fractions of a symbol period, means for converting these N estimates of phase change to soft decisions for the transmitted bits, and means for additively combining these soft decisions over at least a substantial period to obtain soft decisions for each of log 2 M bits per symbol.Ģ.