Telegraphy – Systems – Alternating or pulsating current
Patent
1975-11-06
1977-05-17
Safourek, Benedict V.
Telegraphy
Systems
Alternating or pulsating current
325324, H04L 2722
Patent
active
040243427
ABSTRACT:
A data transmitting and receiving system in which data is transmitted by varying the phase and amplitude of a carrier, including a receiver which detects the data in a received signal while reducing the effects of noise components which alter the phase and amplitude of the received signal. An in-phase component and a quadrature component are derived from the received signal and are then rotated an angular amount which is a function of an estimated value of the phase error in the received signal. The rotated components are then compared with two sets of reference coordinates for selecting a pair of reference coordinates which have values closest to the values of the rotated in-phase and quadrature components, respectively. The estimated value of the phase error is derived as a trigonometric function of the rotated components and selected reference coordinates. The selected reference coordinates are indicative of the transmitted data.
REFERENCES:
patent: 3924197 (1975-12-01), Okano et al.
patent: 3935535 (1976-01-01), Motley et al.
Croisier Alain
Desblache Andre Eugene
Arnold Jack M.
International Business Machines - Corporation
Safourek Benedict V.
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