Method and apparatus for recovering baud timing from correlation

Details Method and apparatus for recovering baud timing from correlation Method and apparatus for recovering baud timing from correlation

1996-06-28

1998-11-03

Pham, Chi H.

Pulse or digital communications

Receivers

Interference or noise reduction

375340, 375316, 329304, 333127, H03D 106, H03D 100, H03D 300, H01P 308

Patent

active

058320458

ABSTRACT:
A signal processing arrangement adjusts baud timing in a communication system receiver, wherein an information signal comprised of (sin(x))/x function contributions of successively adjacent bits is received via a memoryless channel. The information signal is sampled in accordance with a baud sampling clock signal, to derive successive samples of bits contained in the information signal. The sampling clock signal has a baud sampling clock frequency that is adjusted by a phase locked loop in accordance with a timing error signal. The signal processing arrangement comprises an intersymbol interference (ISI) correlation-driven baud timing recovery scheme which makes use of the fact that, for a given bit, at all instances in time other than where its peak occurs, the channel will contain energy from adjacent bits, so that there will be a substantial correlation of channel energy among successively adjacent bits of a transmitted sequence. On the other hand, for baud timing accurately at the peak of a given bit, none of the energy of any other bit will contribute to the energy at that baud time. The timing error signal is based upon ISI-correlation of adjacent bits.

REFERENCES:
patent: 4494242 (1985-01-01), Ehrenbard et al.
patent: 4849703 (1989-07-01), Easley et al.
patent: 4896334 (1990-01-01), Sayar
patent: 5276711 (1994-01-01), Rossi
patent: 5675612 (1997-10-01), Solve et al.

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