Method and apparatus for correcting for clock and carrier freque

Details Method and apparatus for correcting for clock and carrier freque Method and apparatus for correcting for clock and carrier freque

1990-04-16

1993-04-27

Chin, Stephen

Pulse or digital communications

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Testing

455258, H04L 2706

Patent

active

052068862

ABSTRACT:
A method of correcting for the impairments of phase jitter and frequency offset imposed by a transmission medium and of a clock frequency difference between a transmitting and a receiving multicarrier modem is disclosed. The method comprises two modes: a training mode that uses pilot tones, and a data mode that uses random data modulated onto many carriers. During the training mode the frequencies of the phase jitter are estimated, and the parameters of a correcting signal are initialized; during the data mode the correcting signal is used to compensate for the impairments, and then is updated from an estimate of the phase error.

REFERENCES:
patent: 4298986 (1985-11-01), Hughes
patent: 4514855 (1985-04-01), Lang et al.
patent: 4947409 (1990-08-01), Raith et al.
patent: 5012491 (1991-04-01), Iwasaki
John A. C. Bingham "Theory and Practice of Modem Design", John Wiley & Sons pp. 182-185, 1988.
D. D. Flaconer "Jointly Adapive Equalizaion and Carrier Recovery in Two-Dimensional Digital Communication System", Bell System Tech J. vol. 55 pp. 317-334, Mar. 1976.
B. Hirosaki et al. "A 19.2K KBPS Voiceband Data Modem Based on Orthoganility Multiplexed QAM Techniques" IEEE Int. Con. Comm. Rec. pp. 661-665, Aug. 1985.
R. Roy, A. Paulras and T. Kailath "Esprit"--A Subspace Rotation Approach to Estimation of Parameters of CISOIDS in NDISE IEEE Trans ASP vol. ASSP 34 pp. 1340-1342 Oct. 1986.

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