Method for transmitting digital data

Details Method for transmitting digital data Method for transmitting digital data

1986-07-02

1988-07-05

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 40, H04B 702, H04L 2722

Patent

active

047560096

ABSTRACT:
A method for transmitting digital data wherein the data are transmitted in several transmission sections (I-IV) which in each case contain several symbols (1-6). In the transmitter, the phase of a carrier wave is modulated by n different phase angles and their frequency is suddenly changed at the beginning or at the end of each transmission section. So that the individual transmission sections (I-IV) can be synchronized in the receiver, at least one symbol from each transmission section is additionally transmitted by the transmitter in another transmission section as synchronization information. In the receiver, the phases of the carrier wave within the individual transmission sections, that is to say the block phases, are first determined independently of each other by means of an estimating method directly from sections of the carrier wave modulated with the respective data, apart from a phase uncertainty of n-times. The final block phases are finally obtained by evaluation of the synchronization information.

REFERENCES:
patent: 3310741 (1967-03-01), Uitermark et al.
patent: 3736507 (1973-05-01), Wolejsza et al.
patent: 3962637 (1976-06-01), Motley et al.
patent: 4349915 (1982-09-01), Costas
patent: 4583231 (1986-04-01), Puckette
IEEE Transactions on Communications, vol. COM-29, No. 11, Nov. 1981, pp. 1644, 1645, 1648, 1649, 1660-1663.
Archi v fur Elektronik und Ubertragungstechnik, Band 33, No. 7/8, Jul./Aug. 1979, Stuttgart, West Germany; J. Krebser.
IEEE, Transactions on Information Theory, Band IT-29, No. 4, Jul. 1983, New York; A. J. Viterbi et al.

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