Method for receiving carrier oscillations modulated with a usefu

Details Method for receiving carrier oscillations modulated with a usefu Method for receiving carrier oscillations modulated with a usefu

1988-12-07

1990-06-12

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

455142, 329308, H03D 322

Patent

active

049339583

ABSTRACT:
Method for receiving carrier oscillations modulated with a useful signal. For a universal transmitting/receiving device, a method for the automatic adaptation of its modem to the type of modulation of the incoming signal is provided in which the incoming DPSK signal is first demodulated. The demodulator output signal is then converted into a polar co-ordinate representation and, after formation of the difference phase angle (.DELTA..phi.), its value frequency (H) is represented modulo 90.degree. in a histogram which can be evaluated for derivation of the control information.

REFERENCES:
patent: 3843931 (1974-10-01), Sarkilahti
patent: 4470147 (1984-09-01), Goatcher
patent: 4546322 (1985-10-01), Crutcher
patent: 4731796 (1988-03-01), Masterton et al.
patent: 4804924 (1989-02-01), Chassaing et al.
"Der Fernmelde-Ingenieur", Zeitschrift fur Ausbildung and Fortbildung, 1984, pp. 1-56.
"Datenubertragung uber das Telefonnetz", CCITT-Empfehlungen der V-Serie und der X-Serie 5., erweiterte Auflage, 1985, pp. 130-233.
"Understanding PSK Demodulation Techniques", by J. Mark Steber, Microwaves & RF, Mar. 1984, pp. 137-145.
"Microprocessor Implementation of High-Speed Data Modems", by Piet J. Van Gerwen et al., Data Communication Systems of the IEEE Communications Society, Sep. 27, 1976, pp. 238-250.

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