From experience with indoor wireless networks: A link quality metric that captures channel memory

Keshavarzian A., Uysal-Biyikoglu E., Lal D., Chintalapudi K.

IEEE COMMUNICATIONS LETTERS, vol.11, no.9, pp.729-731, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 11 Issue: 9
  • Publication Date: 2007
  • Doi Number: 10.1109/lcomm.2007.070683
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.729-731
  • Keywords: indoor wireless channel, coherence time, link quality metric, channel memory, link inefficiency
  • Middle East Technical University Affiliated: No


With ARQ based link-layer schemes, energy consumption on a link increases with packet retransmissions. We define the inefficiency of a link as the expected number of transmissions before a packet is successfully received on that link. Memory in the packet success process, caused by long indoor coherence times, strongly influences inefficiency. Based on measurements, we build a simple model for the packet success process that incorporates memory and predicts our metric practically and accurately. In particular, inefficiency is asymptotically linear in the memory duration when there is a nonzero probability of a deep fade, and approximately logarithmic otherwise.