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

A. Korhan Tanc, Tolga M. Duman, Cihan Tepedelenlioglu

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


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.

Original languageEnglish (US)
Article number6663753
Pages (from-to)2356-2359
Number of pages4
JournalIEEE Communications Letters
Issue number12
StatePublished - Dec 2013


  • Density evolution
  • low-density parity-check codes
  • network coding
  • relay channels

ASJC Scopus subject areas

  • Modeling and Simulation
  • Computer Science Applications
  • Electrical and Electronic Engineering


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