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

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      Author(s)
      Tanc, A. K.
      Duman, T. M.
      Tepedelenlioglu, C.
      Date
      2013
      Source Title
      IEEE Communications Letters
      Print ISSN
      1089-7798
      Publisher
      IEEE
      Volume
      17
      Issue
      12
      Pages
      2356 - 2359
      Language
      English
      Type
      Article
      Item Usage Stats
      190
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      185
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      Abstract
      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 for estimating the decoding threshold of the LDPC code ensemble. We utilize the proposed method in conjunction with a random walk optimization procedure to obtain good LDPC code degree distributions. Numerical results demonstrate that the specifically designed LDPC codes can attain improvements of about 0.3 dB over off-the-shelf LDPC codes (designed for point-to-point additive white Gaussian noise channels), i.e., it is new code designs are essential to optimize the performance of TWR systems.
      Keywords
      Density evolution
      Additive white Gaussian noise channel
      Degree distributions
      Density evolution
      Low-density parity-check (LDPC) codes
      Optimization procedures
      Physical-layer network coding
      Relay channels
      Two-way relay systems
      Decoding
      Design
      Forward error correction
      Network coding
      Optimization
      Permalink
      http://hdl.handle.net/11693/26719
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/LCOMM.2013.111113.132134
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      • Department of Electrical and Electronics Engineering 4012
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