Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1998-04-06
2000-04-25
Pham, Chi H.
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
375325, H03D 100
Patent
active
060552824
ABSTRACT:
A digital phase quantized frequency modulation (FM) detector (300) is for a communication receiver (100). A digital phase FM quantizer receives (310) I and Q signals (221, 222) derived from a received FM signal (119) and generates a coded position word (381) of width M bits at the beginning of each period of a sample clock (190) that identifies a sector location of a phasor representing the I and Q signals. A two's complement converter (400) converts the coded position word into a two's complement position word of width M bits. A differentiator (420) of width M bits generates a two's complement difference word which represents a change of a phase angle of the phasor in magnitude and direction during each period of the sample clock. A digital post detection filter filters consecutive two's complement difference words and generates therefrom a reconstructed digital demodulated signal (461).
REFERENCES:
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patent: 5469112 (1995-11-01), Lee
patent: 5602879 (1997-02-01), Wada
patent: 5633895 (1997-05-01), Powell, II
patent: 5661759 (1997-08-01), Tulai
Hughes James David
Luff Gwilym Francis
Corrielus Jean B.
Lamb James A.
Motorola
Pham Chi H.
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