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EURASIP Journal on Wireless Communications and Networking
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SmartMIMO: An Energy-Aware Adaptive MIMO-OFDM Radio Link Control for Next-Generation Wireless Local Area Networks

EURASIP Journal on Wireless Communications and Networking volume 2007, Article number: 098186 (2007) | Download Citation

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Abstract

Multiantenna systems and more particularly those operating on multiple input and multiple output (MIMO) channels are currently a must to improve wireless links spectrum efficiency and/or robustness. There exists a fundamental tradeoff between potential spectrum efficiency and robustness increase. However, multiantenna techniques also come with an overhead in silicon implementation area and power consumption due, at least, to the duplication of part of the transmitter and receiver radio front-ends. Although the area overhead may be acceptable in view of the performance improvement, low power consumption must be preserved for integration in nomadic devices. In this case, it is the tradeoff between performance (e.g., the net throughput on top of the medium access control layer) and average power consumption that really matters. It has been shown that adaptive schemes were mandatory to avoid that multiantenna techniques hamper this system tradeoff. In this paper, we derive smartMIMO: an adaptive multiantenna approach which, next to simply adapting the modulation and code rate as traditionally considered, decides packet-per-packet, depending on the MIMO channel state, to use either space-division multiplexing (increasing spectrum efficiency), space-time coding (increasing robustness), or to stick to single-antenna transmission. Contrarily to many of such adaptive schemes, the focus is set on using multiantenna transmission to improve the link energy efficiency in real operation conditions. Based on a model calibrated on an existing reconfigurable multiantenna transceiver setup, the link energy efficiency with the proposed scheme is shown to be improved by up to 30% when compared to nonadaptive schemes. The average throughput is, on the other hand, improved by up to 50% when compared to single-antenna transmission.

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Author information

Affiliations

  1. Department of Nomadic Embedded Systems, IMEC, Kapeldreef 75, Leuven, 3001, Belgium

    • Bruno Bougard
    • , Gregory Lenoir
    • , Antoine Dejonghe
    • , Liesbet Van der Perre
    •  & Francky Catthoor

  2. K. U. Leuven, Department of Electrical Engineering, Katholieke Universiteit Leuven, ESAT, Leuven, 3000, Belgium

    • Bruno Bougard
    • , Francky Catthoor
    •  & Wim Dehaene

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Corresponding author

Correspondence to Bruno Bougard.

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Keywords

  • Medium Access Control
  • Wireless Local Area Network
  • Medium Access Control Layer
  • Spectrum Efficiency
  • Average Power Consumption