Apparatus and method for detecting digital FM

Details Apparatus and method for detecting digital FM Apparatus and method for detecting digital FM

1998-03-27

1999-11-30

Grimm, Siegfried H.

Demodulators

Frequency shift keying or minimum shift keying demodulator

329315, 375324, 375334, 375336, H04L 2714

Patent

active

059949538

ABSTRACT:
A symbol detector for frequency modulated (FM) symbols includes a section determiner, a direction of movement determiner and a data symbol determiner. The section determiner receives a sample of in-phase and quadrature signals associated with a baseband transmitted FM symbol and determines the section value of a unit circle in an in-phase--quadrature coordinate system in which the sample lies. The direction of movement determiner receives the section value of a current sample and the section value of a neighboring sample and generates a positive direction of movement value if the direction of movement along the unit circle from the neighboring sample to the current sample is counterclockwise, a negative direction of movement value if the direction of movement is clockwise and 0 otherwise. The data symbol determiner receives the direction of movement values and decodes the transmitted FM symbol by masking N direction of movement values.

REFERENCES:
patent: 4322851 (1982-03-01), Vance
patent: 5453715 (1995-09-01), Lee
patent: 5469112 (1995-11-01), Lee
"Zero-Crossing Baseband Demodulator", E.K.B. Lee, 0-7803-3002-1/95 --IEEE 1995, pp. 466-470.

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