Pulse or digital communications – Repeaters – Testing
Patent
1989-08-24
1991-10-15
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 42, 375106, 375119, 379 97, H03C 500, H03D 500
Patent
active
050581341
ABSTRACT:
In data transmission wherein a transmitting modem transmits data signals to a receiving modem via a telephone line, the process of rotating, in the transmitting modem, the phase of the point of the constellation resulting from a group of data bits by a predetermined phase value, and then rotating, after a predetermined delay in the receiving modem, the phase of the estimated point resulting from the transformation of the analog signal by the opposite of said predetermined phase value, and calculating the mean-squared error between the rotated point and the estimated point of the constellation the error being used to determine whether the receiving modem is out of synchronization.
REFERENCES:
patent: 4679227 (1987-07-01), Hughes-Hartegs
patent: 4777640 (1988-10-01), Turner et al.
patent: 4894844 (1990-01-01), Forney, Jr.
patent: 4943980 (1989-05-01), Dobson et al.
Electronics, vol. 39, No. 22, 31st Oct. 1966, pp. 91-94; M. Poppe: "Double Phase-Shift Keying Speeds Data Over Voice Channels", p. 91, Column 2, Paragraph 3, p. 92, Column 1, Paragraph 2, figure at foot of p. 92.
Patent Abstracts of Japan, vol. 12, No. 291 (E-644), 9th Aug. 1988; & JP-A-63 067 851 (Fujitsu) Abstract.
Chevillat Pierre R.
Eleftheriou Evangelos
Maidwald Dietrich G. U.
Quintin Michel
Bocure Tesfaldet
Duffield Edward H.
International Business Machines Corp.
Safourek Benedict V.
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