Method and arrangement for the digital regulation of the carrier

Details Method and arrangement for the digital regulation of the carrier Method and arrangement for the digital regulation of the carrier

1980-12-15

1983-06-21

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329107, 329110, 375 83, 375 99, H04L 2722

Patent

active

043896162

ABSTRACT:
A method for digitally regulating the residual carrier phase error in receivers of digital data transmission systems. A comparator compares the sampled data signal or value of the carrier demodulated input signal to the receiver with the estimated value for each associated sampling time or moment as provided by a decider, to determine the deviation dk which is a measure for the phase difference between the sampled value and the associated estimated value. This deviation dk is filtered in a digital loop filter, including a proportional branch and an integration branch, and a regulating value for the demodulated input signal is obtained from a subsequently connected accumulator. A non-linear limitation on the deviation dk is included in the integration branch of the digital loop filter.

REFERENCES:
Freeny, "Special-Purpose Hardware for Digital Filtering", Proceedings of the IEEE, vol. 63, Apr. 1975, pp. 633-648.
Gockler et al, "Datenubertragung mit 4.8 Kbits/s im Fernsprechnetz", _Wissenschaftliche Berichte AEG-Telefunken, vol. 51, 1978, pp. 231-245.
George et al, "An Adaptive Decision Feedback Equalizer", IEEE Transactions on Communication Technology, vol. COM-19, Jun. 1971, pp. 281-293.
Maddens, "Carrier-Phase Tracking in Synchronous Data Transmission Systems", IBM Technical Disclosure Bulletin, vol. 19, Oct. 1976, pp. 1729-1732.
Kammeyer et al, "Ein Flexibles Experimentiersystem fur die Datenubertragung im Fernsprechbereich (Teil I)", Frequenz, vol. 33, No. 5, 1979, pp. 141-145.
Kammeyer et al, "Ein Flexibles Experimentiersystem fur die Datenubertragung im Fernsprechbereich (Teil II)", Frequenz, vol. 33, No. 6, 1979, pp. 165-172.
"Microprocessor Implementation of High-Speed Data Modems", Van Gerwen et al, IEEE Transactions on Communications, vol. COM-25, No. 2, Feb. 1977, pp. 238-250.
"A High Performance Digital QAM 9600 bit/s Modem", Akashi et al, NEC Research & Development, No. 45, Apr. 1977, pp. 38-49.

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