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Advances in Multimedia
Volume 2007, Article ID 95807, 14 pages
http://dx.doi.org/10.1155/2007/95807
Research Article

A Study on the Usage of Cross-Layer Power Control and Forward Error Correction for Embedded Video Transmission over Wireless Links

1Department of Information and Communication Technology, University of Trento, Via Sommarive 14, Povo (Trento) 38050, Italy
2CREATE-NET International Research Center, Via Solteri 38, Trento 38100, Italy
3Electrical Engineering and Computer Science Department, Northwestern University, Evanston, IL 60208, USA

Received 24 December 2006; Accepted 5 May 2007

Academic Editor: Haohong Wang

Copyright © 2007 Fabrizio Granelli et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Cross-layering is a design paradigm for overcoming the limitations deriving from the ISO/OSI layering principle, thus improving the performance of communications in specific scenarios, such as wireless multimedia communications. However, most available solutions are based on empirical considerations, and do not provide a theoretical background supporting such approaches. The paper aims at providing an analytical framework for the study of single-hop video delivery over a wireless link, enabling cross-layer interactions for performance optimization using power control and FEC and providing a useful tool to determine the potential gain deriving from the employment of such design paradigm. The analysis is performed using rate-distortion information of an embedded video bitstream jointly with a Lagrangian power minimization approach. Simulation results underline that cross-layering can provide relevant improvement in specific environments and that the proposed approach is able to capitalize on the advantage deriving from its deployment.