Open-loop link adaptation for next-generation IEEE 802.11n wireless networks

Qiuyan Xia, Mounir Hamdi, Khaled Letaief

Research output: Contribution to journalArticle

26 Citations (Scopus)


In this paper, we propose a novel open-loop autorate fallback algorithm (i.e., the AutoRate Fallback for High-Throughput (ARFHT) algorithm) for the emerging high-throughput (HT) IEEE 802.11n wireless networks. ARFHT extends the legacy link adaptation algorithms for single-input-single-output (SISO) wireless networks to be applicable in the context of multiple-input-multiple-output (MIMO)-based 802.11n wireless networks. It adapts the MIMO mode in terms of spatial multiplexing and spatial diversity, which are the two fundamental characteristics of MIMO technology. It also modifies the link estimation and probing behavior of legacy SISO algorithms. The combined adaptation to the appropriate MIMO mode and the modulation coding scheme together achieves more efficient channel utilization. We will present in detail the design guidelines and key ideas for the ARFHT algorithm. A comprehensive simulation study using ns-2 demonstrates that ARFHT achieves excellent throughput and packet error-rate performance in diverse environments and is highly responsive to time-varying link conditions with minimum computational complexity and protocol overhead.

Original languageEnglish
Pages (from-to)3713-3725
Number of pages13
JournalIEEE Transactions on Vehicular Technology
Issue number7
Publication statusPublished - 2009
Externally publishedYes



  • 802.11n
  • Link adaptation
  • Modulation and coding schemes (MCSs)
  • Multiple-input-multiple-output (MIMO)
  • Open loop
  • SDM
  • STBC

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Aerospace Engineering
  • Automotive Engineering
  • Computer Networks and Communications
  • Applied Mathematics

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