Optimizing error floor performance of finite-precision layered decoders of low-density parity-check (LDPC) codes

摘要

Systems and methods are provided for selecting precisions during iterative decoding with a low-density parity check (LDPC) decoder in order to maximize LDPC code's performance in the error floor region. The selection of the precision of the messages may be done in such a way as to avoid catastrophic errors and to minimize the number of near-codeword errors during the decoding process. Another system and method to avoid catastrophic errors in the layered (serial) LDPC decoder is provided. Lastly, a system and method that select precisions and provide circuitry that optimizes the exchange of information between a soft-input, soft-output (SISO) channel detector and an error correction code (ECC) decoder for channels with memory is provided.

主权项

1. A system for determining when a variable node message is saturated, the system comprising:
memory circuitry configured to store check node messages and variable node messages; processing circuitry configured to:
set a flag to a first value;update a variable node message of the stored variable node messages, based on the stored check node messages;determine if the variable node message is saturated; andif the variable node message is saturated, set the flag to a second value, wherein the flag is set to one of two possible values that indicates whether the variable node message is saturated.