Systems and methods for communication system control...

Details Systems and methods for communication system control... Systems and methods for communication system control...

2011-06-14

2011-06-14

Pascal, Leslie (Department: 2613)

Optical communications

Receiver

Including postcompensation

Reexamination Certificate

active

07962049

ABSTRACT:
The present invention provides systems and methods for communication system control utilizing corrected forward error correction (FEC) error location identifiers in multi-level modulation scheme systems. The present invention utilizes precise error correction information, available for each FEC block of a particular code (including, but not limited to, block codes and concatenated block codes employing iterative decoding as well as convolutional codes (including turbo codes) and low-density parity-check code (LDPC) class codes) used (e.g., Bose, Ray-Chaudhuri, Hocquenghem (BCH), Reed-Solomon, etc.), as a result of the FEC decoding process to provide feedback to close the loop for control of a demodulator (i.e., receiver). Each error location can be uniquely traced back to a particular sub-rate signal path, with running, post-FEC corrected BER (bit error rate) calculations generated on each sub-rate signal. Advantageously, this provides the ability to adjust thresholds and various other parameters to achieve and maintain error-free operation quickly.

REFERENCES:
patent: 7574146 (2009-08-01), Chiang et al.
patent: 2004/0228635 (2004-11-01), Price
patent: 2006/0127100 (2006-06-01), Frankel et al.

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