Pulse or digital communications – Receivers – Automatic baseline or threshold adjustment
Patent
1995-08-04
2000-09-05
Chin, Stephen
Pulse or digital communications
Receivers
Automatic baseline or threshold adjustment
375316, 34031001, H04L 2506
Patent
active
061154296
ABSTRACT:
A data receiving method used in a powerline environment is used for converting a modulated signal received from a powerline over a data period within a predetermined clear zone after one zero crossing point of the powerline into a data bit. Each data period includes at least one predetermined bit period. The modulated signal is received within the bit period of one data period. The method includes: detecting zero crossing points of the powerline and generating a SYNC signal when a zero crossing point is detected; converting signals contained within the bit period of a data period after each SYNC signal into digital samples; generating an adaptive threshold according to the digital samples converted from the bit periods of a plurality of data periods; and converting the digital samples converted from the modulated signal into the data bit by using the adaptive threshold.
REFERENCES:
patent: 4200862 (1980-04-01), Campbell et al.
patent: 4769760 (1988-09-01), Kroll et al.
patent: 5005187 (1991-04-01), Thompson
Chin Stephen
Ghebretinsae T.
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