Adaptive HARQ for mobile WiMAX systems over time-varying channels

  • Authors:

  • Rong-Terng Juang;Pangan Ting;Kun-Yi Lin;Hsin-Piao Lin;Ding-Bing Lin

  • Affiliations:

  • Industrial Technology Research Institute, Hsinchu, Taiwan;Industrial Technology Research Institute, Hsinchu, Taiwan;Institute of Computer and Communication Engineering, National Taipei University of Technology, Taipei, Taiwan;Institute of Computer and Communication Engineering, National Taipei University of Technology, Taipei, Taiwan;Institute of Computer and Communication Engineering, National Taipei University of Technology, Taipei, Taiwan

  • Venue:
  • MWS'09 Proceedings of the 2009 IEEE conference on Mobile WiMAX
  • Year:
  • 2009

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Abstract

By retransmission and combining multiple copies of a packet, conventional hybrid ARQ (automatic-repeat-request) schemes are effective to increase the SNR (signal-to-noise ratio) of received signal but not capable of reducing ICI (inter-carrier interference). This paper proposes an adaptive HARQ scheme, which incorporates ICI cancellation into the conventional IR (incremental redundaney)-based HARQ and automatically activates the ICI cancellation without Doppler shift/mobility estimation. Simulations shows that the proposed algorithm outperforms the conventional one in time-varying channels, especially in high mobility environments because it retransmits signals with higher reliabilities.