Viterbi receiver with improved timing means

Details Viterbi receiver with improved timing means Viterbi receiver with improved timing means

1992-04-16

1994-03-01

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

375 12, 375101, H03H 730, H03H 740, H03K 5159, H03D 106

Patent

active

052915239

ABSTRACT:
Data receiver in which a received signal is sampled and converted to a digital signal by an analog-to-digital converter (1), the signal samples being detected by a Viterbi detector (3). In order to have the sampling effected at the correct instants, these sampling instants are derived from the received symbol values and an error signal which is a metric for a difference between an expected and a recent signal sample. This is effected by a multiplier 4, a low-pass filter 5 and a control signal for a controllable clock oscillator (6). For utilizing the energy in a precursor of the received signal, an error signal e(k-1) is used which is obtained at a later instant than the instant at which a provisional decision about the relevant data symbol a(k-2) is made.

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patent: 4959845 (1990-09-01), Tol et al.
patent: 5020078 (1991-05-01), Crespo
patent: 5131011 (1992-07-01), Bergmans et al.
Armstrong, "Symbol Synchronization Using Band-Rate Sampling and Data-Sequence-Dependent Signal Processing", Jan. 1991, IEEE Transactions on Communications, vol. 39, No. 1, pp. 127-132.
C. N. Georghiades et al., "Sequence Estimation and Synchronization from Nonsynchronized Samples," IEEE Transactions on Information Theory, vol. 37, No. 6, Nov. 1991, pp. 1649-1657.
C. A. Ehrenbard et al., "Band-Rate Line-Interface for Two-Wire High-Speed Digital Subscriber Loops", IEEE Global Telecommunications Conference, Globecom '82, vol. 2, pp. 931-934.
G. Ungerboeck, "Decision Directed Method for Timing Recovery in PAM Data Signal Receivers," IBM Technical Disclosure Bulletin, vol. 18, No. 3, Aug. 1975 pp. 769-771.

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