Receiver and demodulator for phase or frequency modulated signal

Details Receiver and demodulator for phase or frequency modulated signal Receiver and demodulator for phase or frequency modulated signal

1997-05-07

1998-09-15

Grimm, Siegfried H.

Demodulators

Frequency shift keying or minimum shift keying demodulator

329303, 329304, 329310, 375324, H04L 27156

Patent

active

058085092

ABSTRACT:
In a quadrature receiver for phase and/or frequency modulated signals an intermediate phase signal is quantized to produce a quantized phase signal. The receiver includes a demodulator in which pulses are generated from the quantized phase signal and it is determined whether two successive pulses have different polarities, and if so, a reconstructed baseband signal transition is produced at a predetermined reconstruction instant between the two successive pulses. The reconstruction instant is chosen in the middle between two successive pulses for FSK modulation, and it is chosen at different positions between the two pulses for other types of modulation, such as GMSK or multi-level FSK.

REFERENCES:
patent: 4322851 (1982-03-01), Vance
patent: 4942591 (1990-07-01), Nease et al.
"A Fully integrated 1V/100.mu. A high CP-FSK receiver", by Matthijs D. Pardoen, Proceedings of the Workshop Advances in Analogue Circuit Design, Apr. 6-8, 1993, Katholieke Universiteit Leuven, 15 pages.

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