Transmission system comprising receiver with improved timing mea

Details Transmission system comprising receiver with improved timing mea Transmission system comprising receiver with improved timing mea

1994-05-06

1996-10-29

Bocure, Tesfaldet

Pulse or digital communications

Synchronizers

Synchronizing the sampling time of digital data

375343, 375373, H04L 700, H04L 2714, H03D 324

Patent

active

055703968

ABSTRACT:
In a digital symbol receiver it is necessary to generate a clock signal with a correct frequency and phase, so that decisions a.sub.k about the value of transmitted symbols a.sub.k can be made at the right detection instants. A simple method of obtaining the desired clock signal is to adjust a VCO by means of a control signal obtained from the correlation of a detection signal r(t) with the detected symbols a.sub.k filtered by a symbol filter. The symbol filter may comprise a cascade connection of a differentiator and a filter which has a transfer function which is an estimate of the transfer function of a channel which supplies the transmitted symbols.

REFERENCES:
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patent: 4959845 (1990-09-01), Tol et al.
patent: 5276711 (1994-01-01), Rossi
patent: 5309482 (1994-05-01), Wright et al.
"Timing Recovery in Digital Synchronous Data Receivers" by K. H. Mueller and M. Muller in IEEE Transactions on Communications, vol. COM-24, No. 5, May 1976.
"Low Complexity Viterbi Detector for Magnetic Disc Drives" by N. H. Gottfried in IEEE Proceedings-E, vol. 140, No. 1, Jan. 1993.
"Carrier and Bit Synchronization in Data Communication-A Tutorial Review" by L. E. Franks in IEEE Transactions on Communications, vol. COM-28, No. 8, Aug. 1980.

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