Publication:
Continuous Transmission of Spatially Coupled LDPC Code Chains

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2017-12
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IEEE
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Abstract
We propose a novel encoding/transmission scheme called continuous chain (CC) transmission that is able to improve the finite-length performance of a system using spatially coupled low-density parity-check (SC-LDPC) codes. In CC transmission, instead of transmitting a sequence of independent code words from a terminated SC-LDPC code chain, we connect multiple chains in a layered format, where encoding, transmission, and decoding are performed in a continuous fashion. The connections between chains are created at specific points, chosen to improve the finite-length performance of the code structure under iterative decoding. We describe the design of CC schemes for different SC-LDPC code ensembles constructed from protographs: a (J,K) -regular SC-LDPC code chain, a spatially coupled repeat-accumulate (SC-RA) code, and a spatially coupled accumulate-repeat-jagged-accumulate (SC-ARJA) code. In all cases, significant performance improvements are reported and it is shown that using CC transmission only requires a small increase in decoding complexity and decoding delay with respect to a system employing a single SC-LDPC code chain for transmission.
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Codes on graphs, Spatially coupled LDPC codes, Iterative decoding thresholds, Finite-length code performance
Bibliographic citation
Olmos, P. M., Mitchell, D. G. M., Truhachev, D. & Costello, D. J. (2017). Continuous Transmission of Spatially Coupled LDPC Code Chains. IEEE Transactions on Communications, 65(12), pp. 5097–5109.