Controlling error propagation in network-coded cooperative wireless systems

Ghaleb Al-Habian, Ali Ghrayeb, Mazen Hasna

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

6 Citations (Scopus)

Abstract

In cooperative communications, error propagation at relays degrades the diversity order of the system. To combat that effect, it has been suggested to implement a reliability threshold at the relay to control error propagation. The relay calculates log-likelihood ratio (LLR) values for the bits sent from the source. These values are subjected to a threshold to selectively forward bits that are most reliable and discard bits that are less so, resulting in less errors propagating to the destination. We investigate the application of this technique to a network-coded two-way relay channel, where the relay is assisting two sources simultaneously. We investigate two modes of thresholding at the relay: at the individual-bit level and at the combined-bit level. We analyze the bit-error rates of both thresholding modes and optimize the threshold for both. We show significant gains using thresholding over an unthresholded network-coded system. Based on system simulations, we conclude that utilizing separate thresholds yields better results than utilizing a combined threshold scheme.

Original languageEnglish
Title of host publicationProceedings - 2009 IEEE International Conference on Communications, ICC 2009
DOIs
Publication statusPublished - 2009
Event2009 IEEE International Conference on Communications, ICC 2009 - Dresden, Germany
Duration: 14 Jun 200918 Jun 2009

Other

Other2009 IEEE International Conference on Communications, ICC 2009
CountryGermany
CityDresden
Period14/6/0918/6/09

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Keywords

  • Cooperative systems
  • Diversity methods
  • Error propagation
  • Network coding
  • Relaying strategies
  • Reliability estimation
  • Virtual MIMO

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

Cite this

Al-Habian, G., Ghrayeb, A., & Hasna, M. (2009). Controlling error propagation in network-coded cooperative wireless systems. In Proceedings - 2009 IEEE International Conference on Communications, ICC 2009 [5198855] https://doi.org/10.1109/ICC.2009.5198855