Method and system for forward error correction decoding based on a revised error channel estimate

摘要

An FEC codeword comprises channel information indicating the reliability of the information contained by the FEC codeword. The channel information can be used to generate an initial error channel estimate. Based on the initial error channel estimate, an FEC decoder can decode the FEC codeword to increase the reliability of the information contained by the FEC codeword. According to the present disclosure, a method and system of decoding comprises: comparing a current codeword to a previous codeword in order to identify bits corrected between the previous and current codewords; revising an error channel estimate based on the identified corrected bits, the revised estimate representing a change in the error channel over time; and decoding the codeword based on the revised error channel estimate.

主权项

1. A method for decoding a Forward Error Correction (FEC) codeword, the method comprising:
receiving the FEC codeword comprising soft-values based on an initial error channel estimate; and decoding the received FEC codeword, wherein the decoding is iterative and includes first and second belief propagation updates among a plurality of belief propagation updates, the decoding comprising:
performing the first belief propagation update on the received FEC codeword to generate a first updated FEC codeword, the first belief propagation update based on check-node and variable-node processing the soft-values of the FEC codeword;comparing the received FEC codeword to the first updated FEC codeword in order to identify bits that have been corrected by decoding;revising the initial error channel estimate based on the identified corrected bits;performing an error channel update on the first updated FEC codeword to generate a second updated FEC codeword, the error channel update based on processing the soft-values of the FEC codeword using the revised error channel estimate; andperforming the second belief propagation update on the second updated FEC codeword to generate a third updated FEC codeword, the belief propagation update based on check-node and variable-node processing the soft-values of the FEC codeword.