Continuous Transmission of Spatially Coupled LDPC Code Chains Articles uri icon

publication date

  • December 2017

start page

  • 5097

end page

  • 5109

issue

  • 12

volume

  • 65

International Standard Serial Number (ISSN)

  • 0090-6778

Electronic International Standard Serial Number (EISSN)

  • 1558-0857

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.

keywords

  • codes on graphs; spatially coupled ldpc codes; iterative decoding thresholds; finite-length code performance