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OFDM-based WLANs for home media networks with high node density

The distribution of multimedia content poses an important application area of wireless local networks - particularly in the home environment. However, to achieve a robust and reliable wireless media transmission high demands have to be met - regarding the data rate, the bit error rate or the delay, for example. A high density of active network participants, as it can be expected due to the emerging consumer acceptance of such networks, intensifies the requirement of an efficient usage of the available radio resources.

In the scope of this project we investigate the deployment of OFDM-based WLANs in this application example. Our application scenario distinguishes our examinations from others. We look at home networks with no central entities in a 3D arrangement with high node density. In this scenario, special channel profiles result, which noticeably differ from profiles of other scenarios like office buildings.

Our comprehensive analysis of the transmission channel in typical home environments and the resulting statistical conclusions concerning the transmission behavior show that OFDM based WLAN standards of the IEEE802.11 family provide a good basis for wireless multimedia home networks, but they do not offer enough performance to meet the requirements of home multimedia services. Therefore, we aim at an efficiency increase regarding the usage of network resources.

Therefore, we analyse different static and dynamic adaptation methods. Since there must not arise any effort for the user by the appliance of relevant methods, we develop concepts to deploy these mechanisms in self organizing networks with cooperative nodes.

To evaluate adaptation methods and their efficiency increase potential as well as their impact on the stability and convergence of the whole system we developed a flexible simulation system. This simulation system enables us to perform fast und comprehensive simulations of the networks behavior in the defined scenario.

Our current research activities in this field deal with methods of efficiency measurement, the development and evaluation of appropriate network strategies, the impact of a dynamic channel behavior and the influence of control information.

This project is conducted in the scope of the DFG priority programme "Techniken, Algorithmen und Konzepte für zukünftige COFDM Systeme" (TakeOFDM).

 

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Publications

  • Jostschulte K.; Endemann,W.; Kays, R.:
    Möglichkeiten zur Optimierung von WLAN für die multimediale Inhaus-Vernetzung,
    ITG/FKTG-Fachtagung Elektronische Medien, 11. Dortmunder Fernsehseminar, Dortmund
  • Kays, R.; Jostschulte K.; Endemann,W.:
    Optimisation of IEEE 802.11 Based WLAN for Home Media Networks,
    10th International OFDM-Workshop, 31.8.–1.9.2005, Hamburg
  • Jostschulte, K.; Kays, R.; Endemann, W.:
    Weiterentwicklung von WLAN für die Video-Heimvernetzung,
    21. Tagung der FKTG, Koblenz, Germany, 24.5.-27.05.2004
  • Jostschulte, K.; Kays, R.; Endemann, W.:
    High Efficiency Wireless LAN for Multimedia Home Networks,
    IEEE Internat. Conference on Consumer Electronics 2005, Las Vegas, USA, 10.1.-12.1.2005
  • Jostschulte, K.; Kays, R.; Endemann, W.:
    Enhancement of Wireless LAN for Multimedia Home Networking,
    IEEE Trans. on Consumer Electronics, Vol. 51, No. 1, S.80-86, Feb. 2005
  • Endemann, W.:
    Drahtlose Vernetzung für Multimedia - Eine Übersicht,
    ANGA Cable Convention 2005, Köln, 31.5.-2.6.2005
  • R. Kays, K. Jostschulte, W. Endemann:
    Wireless ad-hoc networks with high node density for home AV transmission,
    IEEE Trans. on Consumer Electronics, vol. 50, S. 463-471, Mai 2004


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Contact

Prof. Dr.-Ing. Rüdiger Kays
Tel.: 0231 755-2100