Method and apparatus for performing frame synchronization in an

Details Method and apparatus for performing frame synchronization in an Method and apparatus for performing frame synchronization in an

1996-10-28

1999-11-30

Pham, Chi H.

Pulse or digital communications

Synchronizers

375355, 375371, 370495, 370503, 370509, H04L 700, H04L 2536, H04J 114, H04J 306

Patent

active

059955686

ABSTRACT:
A method and apparatus for performing DMT frame synchronization in an ADSL system begins by providing a training signal (82) to a receiver of the ADSL system (34). The training signal (82) is processed to result in a desired impulse response. The impulse response is used to reduce inter-symbol interference between time-adjacent DMT frames (100-108). The desired impulse response is used to calculate a frame misalignment value (.DELTA.T). The frame misalignment value (.DELTA.T) of the desired impulse response (84) is then utilized to adjust an internal counter of the receiver to perform frame alignment. The use of the training signal (82) and impulse response (84) to provide for both intersymbol interference reduction (FIG. 5) and frame synchronization (FIG. 8) provides for fast ADSL initialization.

REFERENCES:
patent: 5285474 (1994-02-01), Chow et al.
patent: 5398263 (1995-03-01), Vanderspool, II et al.
patent: 5479447 (1995-12-01), Chow et al.
patent: 5625651 (1997-04-01), Cioffi
patent: 5627863 (1997-05-01), Aslanis et al.
Chow, et al.; "Equalizer Training Algorithms for Multicarrier Modulation Systems"; IEEE Int'l Conf on Communications '93; May 23-26 in Geneva; Tech Prog, Conf Record, vol. 2/3; pp. 761-765.

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