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US 2003/0196154 A1Published application
Optimum threshold for FEC transponders
AssigneeCisco Technology, Inc.
InventorsEmanuela Grandi, Mauro Macchi
Life of this patent
Estimating the term…
Abstract
An optical receiver threshold may be optimized in real time based on a forward error correction (FEC) error statistics. A relative number of corrected ones as compared to corrected zeros is tracked. The threshold is shifted in response to an imbalance between the two types of errors.
Claims21
A method for operating a data receiver, said method comprising:
- comparing a received signal to a threshold to generate a stream of estimated transmitted bits;
- decoding said estimated transmitted bits in accordance with an error correcting code while maintaining counts of “0” bits and “1” bits corrected during decoding;
- and
- adjusting said threshold in accordance with said counts of “0” bits and “1” bits corrected during decoding.
1 more element
Apparatus for operating a data receiver, said apparatus comprising:
- a threshold block that compares a received signal to a threshold to generate a stream of estimated transmitted bits;
- an error correction decoder that corrects said estimated transmitted bits in accordance with an error correcting code while maintaining counts of “0” bits and “1” bits corrected during decoding;
- and
- a threshold adjustment block that adjusts said threshold in accordance with said counts of “0” bits and “1” bits corrected during decoding.
1 more element
Apparatus for operating a data receiver, said method comprising:
- comparing a received signal to a threshold to generate a stream of estimated transmitted bits;
- means for decoding said estimated transmitted bits in accordance with an error correcting code while maintaining counts of “0” bits and “1” bits corrected during decoding;
- and
- means for adjusting said threshold in accordance with said counts of “0” bits and “1” bits corrected during decoding.
1 more element
Dependencies are inferred from the claim text.