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Error Propagation M...
Error Propagation Mitigation in Sliding Window Decoding of Spatially Coupled LDPC Codes
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- Zhu, Min (author)
- Xidian University
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Mitchell, David G.M. (author)
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- Lentmaier, Michael (author)
- Lund University,Lunds universitet,Institutionen för elektro- och informationsteknik,Institutioner vid LTH,Lunds Tekniska Högskola,Trådlös kommunikation (master),Utbildningsprogram, LTH,Kommunikationsteknologi,Forskargrupper vid Lunds universitet,LTH profilområde: AI och digitalisering,LTH profilområden,Department of Electrical and Information Technology,Departments at LTH,Faculty of Engineering, LTH,Wireless communication (M.Sc.),Educational programmes, LTH,Faculty of Engineering, LTH,Communications Engineering,Lund University Research Groups,LTH Profile Area: AI and Digitalization,LTH Profile areas,Faculty of Engineering, LTH
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- Costello, Daniel J. (author)
- University of Notre Dame
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(creator_code:org_t)
- 2023
- 2023
- English 17 s.
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In: IEEE Journal on Selected Areas in Information Theory. - 2641-8770. ; 4, s. 470-486
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http://dx.doi.org/10...
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Abstract
Subject headings
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- In this paper, we investigate the problem of decoder error propagation for spatially coupled low-density parity-check (SC-LDPC) codes with sliding window decoding (SWD). This problem typically manifests itself at signal-to-noise ratios (SNRs) close to capacity under low-latency operating conditions. In this case, infrequent but severe decoder error propagation can sometimes occur. To help understand the error propagation problem in SWD of SC-LDPC codes, a multi-state Markov model is developed to describe decoder behavior and to analyze the error performance of SC-LDPC codes under these conditions. We then present two approaches - check node (CN) doping and variable node (VN) doping - to combating decoder error propagation and improving decoder performance. Next we describe how the performance can be further improved by employing an adaptive approach that depends on the availability of a noiseless binary feedback channel. To illustrate the effectiveness of the doping techniques, we analyze the error performance of CN doping and VN doping using the multi-state decoder model. We then present computer simulation results showing that CN and VN doping significantly improve the performance in the operating range of interest at a cost of a small rate loss and that adaptive doping further improves the performance. We also show that the rate loss is always less than that resulting from encoder termination and can be further reduced by doping only a fraction of the VNs at each doping position in the code graph with only a minor impact on performance. Finally, we show how the encoding problem for VN doping can be greatly simplified by doping only systematic bits, with little or no performance loss.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Telekommunikation (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Telecommunications (hsv//eng)
Keyword
- Code doping
- decoder error propagation
- sliding window decoding
- spatially coupled LDPC codes
Publication and Content Type
- art (subject category)
- ref (subject category)
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