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

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3 Author(s)
Kurkoski, B.M. ; Center for Magnetic Recording Res., California Univ., San Diego, La Jolla, CA, USA ; Siegel, P.H. ; Wolf, J.K.

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 state-based algorithm approaches a nonzero constant as the signal-to-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 message-passing algorithm. Here, a single message-passing detector/decoder matched to the combination of a partial-response channel and an LDPC code is investigated

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Information Theory, IEEE Transactions on  (Volume:48 ,  Issue: 6 )