Method and apparatus for facilitating symbol timing acquisition

Details Method and apparatus for facilitating symbol timing acquisition Method and apparatus for facilitating symbol timing acquisition

1997-02-19

1999-02-16

Ghebretinsae, Temesghen

Pulse or digital communications

Synchronizers

Synchronizing the sampling time of digital data

375376, H04L 400, H03D 324

Patent

active

058728198

ABSTRACT:
A method and apparatus samples (902) a currently received symbol to form sampled values corresponding to sampling times, and evaluates (904) the currently received symbol to determine (906) its value. The method and apparatus recalls (908) a last previously received symbol and selects (916), from a plurality of thresholds (302), a threshold based upon the currently received symbol and the last previously received symbol. The threshold is known to be crossed consistently midway in time between the centers of two adjacent nominal symbols determined by the currently received symbol and the last previously received symbol. The sampled values are compared (920) to locate two adjacent samples, one having a first sampled value greater than the threshold and one having a second sampled value less than or equal to the threshold. A timing phase error is then computed (922, 924) from the first and second sampled values.

REFERENCES:
patent: 4339823 (1982-07-01), Predina et al.
patent: 5121411 (1992-06-01), Fluharty
patent: 5486867 (1996-01-01), Hsu et al.
patent: 5521941 (1996-05-01), Wiatrowski et al.
Masahiko Hirono, Toshio Miki, and Kazuaki Murota, "Multilevel Decision Method for Band-Limited Digital FM with Limiter-Discriminator Detection", IEEE Transactions on Vehicular Technology, vol. VT-33, No. 3, pp. 1141-122, Aug. 1984, USA.

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