PSK Demodulator with automatic compensation of delay induced pha

Details PSK Demodulator with automatic compensation of delay induced pha PSK Demodulator with automatic compensation of delay induced pha

1980-04-03

1983-04-05

Karlsen, Ernest F.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329110, 375 80, 375 83, 375119, H04L 2722, H03D 300

Patent

active

043792669

ABSTRACT:
This circuit compensates for phase variation introduced by the delay element in a PSK (phase shift keyed) demodulator. The signal to be demodulated is split. One portion is delayed while the other portion is fed to a variable phase shifter and then to a hybrid splitter. The delayed signal and quadrature output of the hybrid splitter are fed to a phase detector which recovers the information. The delayed signal and inphase output of the hybrid splitter are fed to a phase tracking circuit. This phase tracker controls the variable phase shifter in a manner which maximizes the detected signal by compensating for phase variations introduced by the delay element. The fixed component of difference in phase between the delayed signal and the shifted signal is either a multiple of 180.degree. or an odd multiple of 90.degree. , depending upon the coding system employed.

REFERENCES:
patent: 3305798 (1967-02-01), Rappeport
patent: 3550021 (1970-12-01), Freeny
patent: 3679983 (1972-07-01), Theriot
patent: 3787775 (1974-01-01), Lanning
patent: 3794921 (1974-02-01), Unkauf
patent: 3818346 (1974-06-01), Fletcher et al.
patent: 3838350 (1974-09-01), Ewanus et al.
patent: 3843931 (1974-10-01), Sarkilahti
patent: 3906376 (1975-09-01), Bass
patent: 3911219 (1975-10-01), Mullins
patent: 3919653 (1975-11-01), Le Mouel
patent: 3944939 (1976-03-01), Le Mouel
patent: 3971996 (1976-07-01), Motley et al.
patent: 3990015 (1976-11-01), Gordy et al.
patent: 3991377 (1976-11-01), Salazar et al.
patent: 3993956 (1976-11-01), Gilmore et al.
patent: 4041533 (1977-09-01), Yamamoto et al.
patent: 4053932 (1977-10-01), Yamaguti et al.
patent: 4055814 (1977-10-01), Abraham et al.
patent: 4088957 (1978-05-01), Perkins
patent: 4091331 (1978-05-01), Kaser et al.
patent: 4100499 (1978-07-01), Monrolin

Affiliated with

Also associated with

Rating

PSK Demodulator with automatic compensation of delay induced pha does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with PSK Demodulator with automatic compensation of delay induced pha, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and PSK Demodulator with automatic compensation of delay induced pha will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-566412