Demodulators – Phase shift keying or quadrature amplitude demodulator
Patent
1995-07-12
1996-08-27
Mis, David
Demodulators
Phase shift keying or quadrature amplitude demodulator
375324, 375330, H03D 300, H04L 2722
Patent
active
055505066
ABSTRACT:
A demodulator (20) demodulates a received signal having phase information into a demodulated signal by differential detection. The demodulator comprises a delay section (22-1 to 22-3) which is supplied with an input signal based on a received signal. The delay section delays the input signal to produce first through third delayed signals which have first through third delayed times different from one another. A differential detecting section (23-1, 23-2) carries out differential detection in accordance with the input signal and the first through the third delayed signals to produce first and second output signals. A first correcting section (24) corrects the first delayed signal on the basis of the first output signal to produce a first corrected signal. A second correcting section (25) corrects the second delayed signal on the basis of the second output signal to produce a second corrected signal. A producing section produces the demodulated signal in accordance with the first and the second corrected signals.
REFERENCES:
patent: 3470478 (1969-09-01), Crafts
patent: 4416016 (1983-11-01), Iapicco
patent: 4547737 (1985-10-01), Gibson
patent: 4965810 (1990-10-01), Peischl et al.
patent: 5017883 (1991-05-01), Divsalar et al.
Mis David
NEC Corporation
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