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Electrical and Electronics

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Universität Duisburg-Essen

Mobile radio:
Smart Antennas
Adaptive MIMO
     communication systems

Filter bank multicarrier
    transmission systems

Adaptive multicarrier

Wideband GHz and THz
     radar sensors

Fire detection:
Automatic Fire Detection
Test devices for
     dust and water fog tests

     Aerosol Charactersiation


Smart Antennas

Stand: 22.08.2016
Universität Duisburg-Essen, Campus Duisburg
  • Adaptive MIMO communication systems

  • In future mobile communication systems, the valuable resource of bandwidth has to be used more efficiently than today. Therefore, it is necessary to adapt transmission techniques to the propagation conditions in a better way. For conventional radio communication systems, the temporal and spatial properties of the radio channel lead to degradations because of time dispersion and fading effects.

    Time dispersion causes intersymbol interference which is avoided by multicarrier transmission. The effects of fading are reduced by adaptive transmission techniques as well as multi-antenna concepts (MIMO, multiple-input multiple-output).

  • Parameters of a multi-antenna multicarrier system which can be adapted:
    • Type of modulation per subchannel,
    • Transmit power per subchannel,
    • Channel coding,
    • MIMO techniques: diversity methods, beamforming, spatial multiplexing.

    Fig. 1: Throughput of an adaptive OFDM-based 2x2 transmission system in indoor (left) and outdoor (right) scenario

    Implementing adaptive techniques (e.g. bit-loading, adaptive modulation and coding, and adapting the MIMO technique) results in significant gains in throughput and reliability over non-adaptive systems. As an example, Fig. 1 illustrates the advantage of an adaptive MIMO system in terms of its throughput. In this setup, both the MIMO scheme and the modulation orders on each subchannel have been optimally adapted to the current state of the radio channel.