Cross-Layer Optimization of OFDM Transmission Systems for MPEG-4 Video Streaming
2004 (English)In: Computer Communications, ISSN 0140-3664, E-ISSN 1873-703X, Vol. 27, no 11, 1044-1055 p.Article in journal (Refereed) Published
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 crosslayer 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%.
Place, publisher, year, edition, pages
Elsevier, 2004. Vol. 27, no 11, 1044-1055 p.
Orthogonal frequency division multiplexing, Signal-to-noise ratio, Cross-layer optimization
IdentifiersURN: urn:nbn:se:kth:diva-134795DOI: 10.1016/j.comcom.2004.01.010ISI: 000221498200002ScopusID: 2-s2.0-1942420705OAI: oai:DiVA.org:kth-134795DiVA: diva2:668075
QC 201311292013-11-282013-11-282014-01-20Bibliographically approved