NDLI: Threshold saturation of spatially-coupled codes on intersymbol-interference channels

Content Provider	IEEE Xplore Digital Library
Author	Nguyen, P.S. Yedla, A. Pfister, H.D. Narayanan, K.R.
Copyright Year	2012
Description	Author affiliation: Department of Electrical and Computer Engineering, Texas A&M University (Nguyen, P.S.; Yedla, A.; Pfister, H.D.; Narayanan, K.R.)
Abstract	Recently, it has been observed that terminated low-density-parity-check (LDPC) convolutional codes (or spatially-coupled codes) appear to approach the capacity universally across the class of binary memoryless channels. This is facilitated by the “threshold saturation” effect whereby the belief-propagation (BP) threshold of the spatially-coupled ensemble is boosted to the maximum a-posteriori (MAP) threshold of the underlying constituent ensemble. In this paper, we consider spatially-coupled codes over intersymbol-interference (ISI) channels under joint iterative decoding where we empirically show that threshold saturation also occurs. This can be observed by first identifying the GEXIT curve that naturally obeys the general area theorem. From this curve, the corresponding MAP and the BP threshold estimates are then numerically obtained. Given the fact that regular LDPC codes can achieve the symmetric information rate (SIR) under MAP decoding, we conjecture that spatially-coupled codes with joint iterative decoding can universally approach the SIR of ISI channels.
Starting Page	2181
Ending Page	2186
File Size	1417286
Page Count	6
File Format	PDF
ISBN	9781457720529
ISSN	15503607
e-ISBN	9781457720536
e-ISBN	9781457720512
DOI	10.1109/ICC.2012.6364433
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-06-10
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Joints Iterative decoding AWGN Upper bound Decoding Bit error rate
Content Type	Text
Resource Type	Article

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