• About
  • Policies
  • What is openaccess
  • Library
  • Contact
Advanced search
      View Item 
      •   BUIR Home
      • Scholarly Publications
      • Faculty of Engineering
      • Department of Electrical and Electronics Engineering
      • View Item
      •   BUIR Home
      • Scholarly Publications
      • Faculty of Engineering
      • Department of Electrical and Electronics Engineering
      • View Item
      JavaScript is disabled for your browser. Some features of this site may not work without it.

      Decoding strategies at the relay with physical-layer network coding

      Thumbnail
      View / Download
      324.2 Kb
      Author
      Bhat, U.
      Duman, T. M.
      Date
      2012
      Source Title
      IEEE Transactions on Wireless Communications
      Print ISSN
      1536-1276
      Publisher
      Institute of Electrical and Electronics Engineers
      Volume
      11
      Issue
      12
      Pages
      4503 - 4513
      Language
      English
      Type
      Article
      Item Usage Stats
      127
      views
      87
      downloads
      Abstract
      A two-way relay channel is considered where two users exchange information via a common relay in two transmission phases using physical-layer network coding (PNC). We consider an optimal decoding strategy at the relay to decode the network coded sequence during the first transmission phase, which is approximately implemented using a list decoding (LD) algorithm. The algorithm jointly decodes the codewords transmitted by the two users and sorts the L most likely pair of sequences in the order of decreasing a-posteriori probabilities, based on which, estimates of the most likely network coded sequences and the decoding results are obtained. Using several examples, it is observed that a lower complexity alternative, that jointly decodes the two transmitted codewords, has a performance similar to the LD based decoding and offers a near-optimal performance in terms of the error rates corresponding to the XOR of the two decoded sequences. To analyze the error rate at the relay, an analytical approximation of the word-error rate using the joint decoding (JD) scheme is evaluated over an AWGN channel using an approach that remains valid for the general case of two users adopting different codebooks and using different power levels. We further extend our study to frequency selective channels where two decoding approaches at the relay are investigated, namely; a trellis based joint channel detector/physical-layer network coded sequence decoder (JCD/PNCD) which is shown to offer a near-optimal performance, and a reduced complexity channel detection based on a linear receiver with minimum mean squared error (MMSE) criterion which is particularly useful where the number of channel taps is large.
      Keywords
      Frequency-selective channel
      Joint decoding
      List decoding
      MMSE detection
      Performance analysis
      Physical-layer network coding
      Two-way relay channels
      Union bounds
      Frequency-selective channels
      Joint decoding
      List decoding
      MMSE detection
      Performance analysis
      Physical-layer network coding
      Two-way relay channels
      Union bounds
      Algorithms
      Communication channels (information theory)
      Mergers and acquisitions
      Network coding
      Network layers
      Optimization
      Decoding
      Permalink
      http://hdl.handle.net/11693/21254
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/TWC.2012.101112.120190
      Collections
      • Department of Electrical and Electronics Engineering 3524
      Show full item record

      Related items

      Showing items related by title, author, creator and subject.

      • Thumbnail

        An efficient computation model for coarse grained reconfigurable architectures and its applications to a reconfigurable computer 

        Atak, Oğuzhan; Atalar, Abdullah (IEEE, 2010-07)
        The mapping of high level applications onto the coarse grained reconfigurable architectures (CGRA) are usually performed manually by using graphical tools or when automatic compilation is used, some restrictions are imposed ...
      • Thumbnail

        Performance analysis of turbo codes over Rician fading channels with impulsive noise 

        Ali, Syed Amjad; Ince, E.A. (IEEE, 2007)
        The statistical characteristics of impulsive noise differ greatly from those of Gaussian noise. Hence, the performance of conventional decoders, optimized for additive white Gaussian noise (AWGN) channels is not promising ...
      • Thumbnail

        Design of LDPC codes for two-way relay systems with physical-layer network coding 

        Tanc, A. K.; Duman, T. M.; Tepedelenlioglu, C. (IEEE, 2013)
        This letter presents low-density parity-check (LDPC) code design for two-way relay (TWR) systems employing physical-layer network coding (PLNC). We focus on relay decoding, and propose an empirical density evolution method ...

      Browse

      All of BUIRCommunities & CollectionsTitlesAuthorsAdvisorsBy Issue DateKeywordsTypeDepartmentsThis CollectionTitlesAuthorsAdvisorsBy Issue DateKeywordsTypeDepartments

      My Account

      Login

      Statistics

      View Usage StatisticsView Google Analytics Statistics

      Bilkent University

      If you have trouble accessing this page and need to request an alternate format, contact the site administrator. Phone: (312) 290 1771
      Copyright © Bilkent University - Library IT

      Contact Us | Send Feedback | Off-Campus Access | Admin | Privacy