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Spatially-Coupled L...
Spatially-Coupled LDPC Codes for Decode-and-Forward Relaying of Two Correlated Sources over the BEC
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Schwandter, S. (författare)
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- Graell i Amat, Alexandre, 1976 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Matz, G. (författare)
- Technische Universität Wien,Vienna University of Technology
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(creator_code:org_t)
- 2014
- 2014
- Engelska.
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Ingår i: IEEE Transactions on Communications. - 0090-6778 .- 1558-0857. ; 62:4, s. 1324-1337
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Abstract
Ämnesord
Stäng
- We present a decode-and-forward transmission scheme based on spatially-coupled low-density parity-check (SC-LDPC) codes for a network consisting of two (possibly correlated) sources, one relay, and one destination. The links between the nodes are modeled as binary erasure channels. Joint source-channel coding with joint channel decoding is used to exploit the correlation. The relay performs network coding. We derive analytical bounds on the achievable rates for the binary erasure time-division multiple-access relay channel with correlated sources. We then design bilayer SC-LDPC codes and analyze their asymptotic performance for this scenario. We prove analytically that the proposed coding scheme achieves the theoretical limit for symmetric channel conditions and uncorrelated sources. Using density evolution, we furthermore demonstrate that our scheme approaches the theoretical limit also for non-symmetric channel conditions and when the sources are correlated, and we observe the threshold saturation effect that is typical for spatially-coupled systems. Finally, we give simulation results for large block lengths, which validate the DE analysis.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)
Nyckelord
- threshold saturation
- relay channel
- Binary erasure channel
- correlated sources
- spatially-coupled low-density parity-check codes
- distributed coding
- decode-and-forward
- cooperative communications
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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