Four phase PSK demodulator

Details Four phase PSK demodulator Four phase PSK demodulator

1986-07-01

1988-07-12

Wan, Gene

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329107, 329110, 329124, 375 80, 375111, 375120, H03D 318, H03D 324, H03K 904, H04L 704

Patent

active

047572728

ABSTRACT:
A demodulator for regenerating and demodulating a carrier signal from a four-phase PSK received signal having a data symbol preamble and a fixed phase (one of four phases) of a particular time width using a synchronous detection type demodulating system (remodulation type demodulating system). The demodulator includes an orthogonal demodulating circuit and a remodulating circuit for regenerating a carrier signal which is the data signal during a preamble transmission period from a received modulated signal. The remodulating circuit includes a demodulator having an AFC circuit for detecting a frequency change using a narrow band filter, means for suppressing frequency changes of the four-phase PSK modulated signal received and means for rendering constant the frequency of the regenerated carrier signal passing through the narrow band filter.

REFERENCES:
patent: 4361894 (1982-11-01), Kurihara et al.
patent: 4409562 (1983-10-01), Kurihara
patent: 4525676 (1985-06-01), Atobe et al.
patent: 4585998 (1986-04-01), Veillard
patent: 4591797 (1986-05-01), Tanimoto et al.
IEEE Transactions on Communications, vol. COM-20, No. 4, Aug. 1972, "Carrier Synchronizer for Coherent Detection of High-Speed . . .", by Yamamoto, et al., pp. 803-807.
IEEE Transactions on Communications, vol. Com-24, No. 8, Aug. 1976, "MSK and Offset QPSK Modulation", by Steven A. Gronemeyer & Alan L. McBride, pp. 809-820.
"An Investigation of a Differently Coherent Detector for Reception of QPSK Signals", by J. Y. Huang, pp. 27.1.1-27.1.6.

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