Equalizer-based timing recovery

Details Equalizer-based timing recovery Equalizer-based timing recovery

1991-12-27

1994-10-04

Chin, Stephen

Pulse or digital communications

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375 14, 333 18, H03H 730

Patent

active

053533127

ABSTRACT:
Timing recovery circuitry for recovering digital data generates a timing signal which is a function of the delay provided by an equalizer to one or more predetermined frequency components of its input signal. Advantageously, this approach is applicable to systems which utilize one or more baseband or passband equalizers. The disclosed embodiments of the present invention pertain to a dual-duplex system. In such a system, the digital data to be transmitted is divided into two different digital signals and each signal is coupled through an associated transmission channel. At the receiver, the received version of each transmitted signal is processed by an associated equalizer and the outputs therefrom are combined to recover the digital data. In the disclosed embodiments of the present invention, the necessary timing signal for such recovery is a function of the delay introduced by each equalizer to at least one predetermined frequency component of that equalizer's input signal.

REFERENCES:
patent: 4004226 (1977-01-01), Qureshi et al.
patent: 4334313 (1982-06-01), Gitlin
patent: 4621366 (1986-11-01), Cain et al.
patent: 4692931 (1987-09-01), Ohsawa
patent: 4800574 (1989-01-01), Tanaka et al.
patent: 4805191 (1989-02-01), Burch et al.
patent: 4815103 (1989-03-01), Cupo
patent: 4975927 (1990-12-01), Yoshida
patent: 5048060 (1991-09-01), Arai et al.
patent: 5097488 (1992-03-01), Kokubo et al.
The Bell System Technical Journal, vol. 54, p. 564 et seq., Mar. 1975.

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