Are multiple descriptions better than one?

Authors:
György Dán;Viktória Fodor;Gunnar Karlsson
Affiliations:
Department of Signals, Sensors and Systems, KTH, Royal Institute of Technology;Department of Signals, Sensors and Systems, KTH, Royal Institute of Technology;Department of Signals, Sensors and Systems, KTH, Royal Institute of Technology
Venue:
NETWORKING'05 Proceedings of the 4th IFIP-TC6 international conference on Networking Technologies, Services, and Protocols; Performance of Computer and Communication Networks; Mobile and Wireless Communication Systems
Year:
2005

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Abstract

In this paper we compare three schemes for error recovery for real-time multimedia applications: media-dependent forward error correction (MD-FEC), proposed for real-time audio; media-independent forward error correction (MI-FEC), proposed for real-time video; and multiple description coding (MDC). We provide a detailed queueing analysis for these schemes considering bursty traffic sources, and combine results from information theory and queueing theory to analyze their performance. We conclude that MDC always performs better than MD-FEC, and that the average loss probability plays a key role in the choice of the optimal parameters. We also show that MDC outperforms MI-FEC if packet losses are highly correlated, like in the current Internet, and if the delay available for error control is low.