Timing recovery in a baud-rate sampled-data system

Details Timing recovery in a baud-rate sampled-data system Timing recovery in a baud-rate sampled-data system

1982-08-30

1985-01-15

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

328151, 328155, H04L 700

Patent

active

044942427

ABSTRACT:
In a high-speed digital data system, it is advantageous to sample incoming data pulses at the baud-rate rather than at the Nyquist-rate. In such a system of the type that includes a dispersive channel (e.g., an unloaded subscriber twisted pair with bridged taps), effective baud-rate sampling and reliable pulse recovery at a receiver depend on the availability of a suitable pulse synchronization or timing recovery technique. In accordance with this invention, timing recovery is based on the recognition that the precursor portion of the response of the channel is relatively invariant and predictable. By selecting a specified threshold point in a small-amplitude region of the precursor portion, a basis is provided for generating accurated bipolar error signals that insure consistent baud-rate sampling of received pulses.

REFERENCES:
patent: 3761818 (1973-09-01), Tazaki et al.
patent: 4320526 (1982-03-01), Gitlin
K. H. Mueller and M. Muller, "Timing Recovery in Digital Synchronous Data Receivers", IEEE Transactions on Communications, vol. COM-24, No. 5, May 1976, pp. 516-531.
P. T. Nielsen and M. W. Gram, "A Digital Hybrid for Two-Wire Digital Subscriber Loops", National Telecommunications Conference, 1978, pp. 21.2.1-21.2.7.

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