LDPC coded soft forwarding with network coding for the two-way relay channel

Dushantha N.K. Jayakody, Jun Li, Mark F. Flanagan

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    5 Citations (Scopus)

    Abstract

    This paper investigates a low-density parity-check (LDPC) coded soft-decode-and-forward (SDF) relaying protocol for a two way relay channel (TWRC). In this SDF protocol, the relay evaluates the reliabilities, expressed as log-likelihood ratios (LLRs), of the received signals from the two sources. The relay then forwards a network-coded combination of the parity symbols of both sources, but in the 'soft' domain to avoid error propagation from the relay. We introduce a model for the effective noise experienced by the soft network coded symbols, constituting the new parameters of soft scalar and soft error; this model is then used to compute the log-likelihood ratios (LLRs) at the destination. To facilitate this latter computation, we have derived an analytical expression for soft error variance, as well as a simplified expression based on a common assumption on the statistical behavior of the LLRs. This enables low-complexity computation and tracking of the soft error variance on-the-fly. The proposed system outperforms standard competing schemes reported in the literature in terms of error rate performance over Rayleigh fading links.

    Original languageEnglish
    Title of host publication2014 IEEE 25th Annual International Symposium on Personal, Indoor, and Mobile Radio Communication, PIMRC 2014
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    Pages253-257
    Number of pages5
    Volume2014-June
    ISBN (Electronic)9781479949120
    DOIs
    Publication statusPublished - 25 Jun 2014
    Event2014 25th IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communication, IEEE PIMRC 2014 - Washington, United States
    Duration: 2 Sep 20145 Sep 2014

    Conference

    Conference2014 25th IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communication, IEEE PIMRC 2014
    CountryUnited States
    CityWashington
    Period2.9.145.9.14

    Fingerprint

    Network coding
    Rayleigh fading

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

    Cite this

    Jayakody, D. N. K., Li, J., & Flanagan, M. F. (2014). LDPC coded soft forwarding with network coding for the two-way relay channel. In 2014 IEEE 25th Annual International Symposium on Personal, Indoor, and Mobile Radio Communication, PIMRC 2014 (Vol. 2014-June, pp. 253-257). [7136170] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/PIMRC.2014.7136170

    LDPC coded soft forwarding with network coding for the two-way relay channel. / Jayakody, Dushantha N.K.; Li, Jun; Flanagan, Mark F.

    2014 IEEE 25th Annual International Symposium on Personal, Indoor, and Mobile Radio Communication, PIMRC 2014. Vol. 2014-June Institute of Electrical and Electronics Engineers Inc., 2014. p. 253-257 7136170.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Jayakody, DNK, Li, J & Flanagan, MF 2014, LDPC coded soft forwarding with network coding for the two-way relay channel. in 2014 IEEE 25th Annual International Symposium on Personal, Indoor, and Mobile Radio Communication, PIMRC 2014. vol. 2014-June, 7136170, Institute of Electrical and Electronics Engineers Inc., pp. 253-257, 2014 25th IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communication, IEEE PIMRC 2014, Washington, United States, 2.9.14. https://doi.org/10.1109/PIMRC.2014.7136170
    Jayakody DNK, Li J, Flanagan MF. LDPC coded soft forwarding with network coding for the two-way relay channel. In 2014 IEEE 25th Annual International Symposium on Personal, Indoor, and Mobile Radio Communication, PIMRC 2014. Vol. 2014-June. Institute of Electrical and Electronics Engineers Inc. 2014. p. 253-257. 7136170 https://doi.org/10.1109/PIMRC.2014.7136170
    Jayakody, Dushantha N.K. ; Li, Jun ; Flanagan, Mark F. / LDPC coded soft forwarding with network coding for the two-way relay channel. 2014 IEEE 25th Annual International Symposium on Personal, Indoor, and Mobile Radio Communication, PIMRC 2014. Vol. 2014-June Institute of Electrical and Electronics Engineers Inc., 2014. pp. 253-257
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