Joint message-passing decoding of LDPC Codes and partial-response channels

Ideas of message passing are applied to the problem of removing the effects of intersymbol interference (ISI) from partial-response channels. Both bit-based and state-based parallel message-passing algorithms are proposed. For a fixed number of iterations less than the block length, the bit-error rate of the statebased algorithm approaches a nonzero constant as the signalto-noise ratio (SNR) approaches infinity. This limitation can be removed by using a precoder. It is well known that low-density parity-check (LDPC) codes can be decoded using a messagepassing algorithm. Here, a single message-passing detector/decoder matched to the combination of a partial-response channel and an LDPC code is investigated.

• Type: Journal
• Year: 2002
• Where: TIT
• Authors: Brian M. Kurkoski, Paul H. Siegel, Jack K. Wolf
• Keywords: Intersymbol Interference, Parallel Message-passing Algorithms, Partial-response Channel, TIT 2002