Baseband demodulation of M-ary frequency shift keyed signals and

Details Baseband demodulation of M-ary frequency shift keyed signals and Baseband demodulation of M-ary frequency shift keyed signals and

1996-11-13

1998-09-08

Mis, David

Demodulators

Frequency shift keying or minimum shift keying demodulator

329302, 375324, 375335, H03D 300, H04L 2714

Patent

active

058050175

ABSTRACT:
A method of, and receiver for, receiving and demodulating M-ary FSK symbols, where M equals two or four, comprising over sampling a received signal to obtain sub-symbols which are treated as repeated DBPSK .pi./4DQPSK symbols, respectively. The sub-symbols are applied to a delay and multiply demodulator in which the duration of the delay has been optimised to give M equidistant points on a unit circle. The output from the demodulator comprises log likelihood ratios which are then integrated in an integrating filter to give a maximum likelihood estimate of the bits comprising the symbols transmitted.

REFERENCES:
patent: 4554509 (1985-11-01), Cornett

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