Cross-layer optimization of OFDM transmission systems for MPEG-4 video streaming

  • Authors:

  • J Gross;J Klaue;H Karl;A Wolisz

  • Affiliations:

  • Telecommunication Networks Group, Technical University of Berlin, Einsteinufer 25, 10587 Berlin, Germany;Telecommunication Networks Group, Technical University of Berlin, Einsteinufer 25, 10587 Berlin, Germany;Telecommunication Networks Group, Technical University of Berlin, Einsteinufer 25, 10587 Berlin, Germany;Telecommunication Networks Group, Technical University of Berlin, Einsteinufer 25, 10587 Berlin, Germany

  • Venue:
  • Computer Communications
  • Year:
  • 2004

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Abstract

In this paper, we study the performance of a combined link- and physical-layer approach for the downlink of a dynamic OFDM-frequency division multiple access transmission system delivering MPEG-4 video streams. The approach consists of three different mechanisms-queue management, resource allocation, and subcarrier assignment-which can be used separately as well as in combination. This cross-layer approach allows to utilize channel-related knowledge and semantic information of the streams' packets. Consecutively adding these mechanisms to the studied system, we judge their respective impact on system performance. To do so, we present a new metric for quality assessment of long video transmissions (considerably longer than 10 s) and apply it to the simulation results. In particular, we introduce a local distortion threshold-based metric instead of an overall average judgment. We find that our combined system approach increases the number of supportable terminals per cell by up to 300%.