Pulse or digital communications – Synchronizers – Synchronizing the sampling time of digital data
Patent
1996-10-22
1998-11-17
Vo, Don N.
Pulse or digital communications
Synchronizers
Synchronizing the sampling time of digital data
375234, 375343, 375222, 3647242, H04L 702
Patent
active
058387447
ABSTRACT:
An apparatus and method for reliable and jitter-free timing recovery in high speed modems which utilizes the correlations of the received data signal points and the demodulated baseband signal samples feeding into a fractionally-spaced adaptive equalizer. This correlation based approach bypasses calculation of the exact transmitter symbol rate as required in traditional timing recovery methods. Also, the receiver timing adjustments are done via the transformed domain by shifting the taps of the adaptive equalizer. No time domain signal sample interpolation is necessary, so that truly jitter-free timing recovery is realized.
REFERENCES:
patent: 4899366 (1990-02-01), Davis et al.
patent: 5414732 (1995-05-01), Kaufmann
patent: 5517526 (1996-05-01), Caudron et al.
CCITT of International Telecommunication Union, "A Duplex Modem Operating at Data Signalling Rates of up to 14 400 bit/s for Use on the General Switched Telephone Network and on Leased Point-to-Point 2-Wire Telephone-Type Circuits," Recommendation V.32 bis, 1991, pp. 1-22.
Bingham, "The Theory and Practice of Modem Design," John Wiley & Sons, 1988, Chapter 7, pp. 189-236.
Le Amanda T.
TALX Corporation
Vo Don N.
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