Pulse or digital communications – Synchronizers – Synchronizing the sampling time of digital data
Patent
1997-04-02
1999-11-23
Chin, Stephen
Pulse or digital communications
Synchronizers
Synchronizing the sampling time of digital data
375342, 375272, 375274, 375334, 375336, 341 68, 341 69, H04L 700, H04L 2706, H03D 100
Patent
active
059913460
ABSTRACT:
A method for determining the best time to sample data bits of a data bit stream of a received information signal in a digital communication system includes the steps of determining the current derivative of a respective sample of the information signal, weighting the sample by a predetermined amount, determining an accumulated derivative value for the same sample number of a previous symbol of the information signal, weighting the previous accumulated derivative value by another predetermined amount, summing the two weighted values together and assigning this accumulated derivative value to the respective sample. The method further includes the step of comparing the accumulated derivative values of a predetermined number of consecutive samples to determine which sample has the greatest accumulated derivative value. The sample having the greatest accumulated derivative value substantially corresponds to the beginning of a symbol. A bit determination sampling signal is generated and is timed to have a pulse or transition which occurs one-half symbol from the occurrence of the sample having the greatest accumulated derivative value.
REFERENCES:
patent: 5671256 (1997-09-01), Clark et al.
patent: 5706314 (1998-01-01), Davis et al.
patent: 5864590 (1999-01-01), Soubaras
patent: 5896422 (1999-04-01), Lu
Chin Stephen
Maddox Michael W.
Uniden San Diego Research and Development Center Inc.
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