Bit error rate contour-based optimum decision threshold and sampling phase selection
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United States of America Patent
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Issued Date -
Jan 18, 2007
app pub date -
Apr 13, 2005
filing date -
Apr 13, 2005
priority date (Note) -
Abandoned
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Abstract
A method and system for a bit error rate (BER) contour-based optimum decision threshold and sampling phase selection in optical communication systems is disclosed. According to one aspect of the invention, for a selected sampling phase and a decision threshold, high BER values are measured. Low BER values are approximated from the high BER values using error functions. The procedures are repeated for all selected sampling phases and decision thresholds and corresponding BER values are calculated. The sampling phases and decision thresholds for each specific BER value are plotted to create the BER contour diagrams. The optimum decision threshold for a sampling phase is calculated by equating the BER due to marks ('1s') and the BER due to spaces ('0s'). In one aspect of the invention, a BER test module resides in the receiver. The BER test module calculates the BERs and the optimum decision threshold and sampling phase.
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