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

1992-05-27

1993-07-13

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 8, 375120, H04L 2706

Patent

active

052280624

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: 4419758 (1983-12-01), Dorey
patent: 4573170 (1986-02-01), Melvin, Jr. et al.
patent: 4747115 (1988-05-01), Nambu
patent: 4945312 (1990-07-01), Auger et al.

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