MIMO-OFDM WLAN architectures, area coverage, and link adaptation for urban hotspots

YQ Bian, AR Nix, EK Tameh, JP McGeehan

Research output: Contribution to journalArticle (Academic Journal)

25 Citations (Scopus)
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Abstract

This paper considers the suitability of a range of multi-input-multi-output (MIMO) orthogonal frequency-division multiplexing architectures for use in urban hotspots. A ray-tracing propagation model is used to produce realistic MIMO channel data. This information is used to determine the expected throughput and area coverage for various physical (PHY) layer schemes. Site-specific throughput predictions are generated in a city-center environment. Link adaptation (LA) is shown to play a key role in the choice of space-time algorithm, the use of adaptive modulation and coding, and the number of antennas employed at both ends of the radio link. No single PHY layer scheme is suitable to cover the entire coverage area. Results demonstrate the need for MIMO LA under a wide range of channel conditions. For the area under test, 2% of covered locations selected a spatial multiplexing (SM) scheme, 50% selected a space-time block coding (STBC) scheme, and 48% selected a hybrid SM/STBC scheme. With suitable power control and LA, for the scenario under consideration, high peak capacities and good geographic coverage were achieved
Translated title of the contributionMIMO–OFDM WLAN architectures, area coverage, and link adaptation for urban hotspots
Original languageEnglish
Pages (from-to)2364 - 2374
Number of pages11
JournalIEEE Transactions on Vehicular Technology
Volume57
Issue number4
DOIs
Publication statusPublished - Jul 2008

Bibliographical note

Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Rose publication type: Journal article

Sponsorship: This work was supported by Toshiba Research Europe Ltd., Bristol, U.K.

Terms of use: Copyright © 2008 IEEE. Reprinted from IEEE Transactions on Vehicular Technology.

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Keywords

  • spatial multiplexing (SM)
  • orthogonal frequency division
  • space–time block codes (STBCs)
  • propagation
  • link adaptation (LA)
  • power control

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