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Research Letters in CommunicationsVolume 2008 2008, Article ID 546184, 4 pages

Research LetterDepartment of Electrical and Computer Engineering, University of Calgary, Calgary, AB, Canada T2N 1N4

Received 8 January 2008; Accepted 18 March 2008

Academic Editor: Luca De Nardis

Copyright © 2008 Azfar Moid and Abraham O. Fapojuwo. 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.


This letter presents an analytical model that jointly exploits the buffer dynamics of both thesending and receiving nodes to find the optimum number of byte-level and packet-level forward errorcorrection FEC units for real-time multimedia transmission over wireless networks. Theproposed analytical model first provides an optimum number of FEC units required at the byte-level, and then chooses the number of FEC units at the packet-level based on current channel andnetwork conditions. The accuracy of the proposed model is dependent on two parameters: thevariable deadline-time at the byte-level and fixed round-trip time RTT delay at the packet-level.Numerical results demonstrate the effectiveness of the model in reducing the unrecoverable errorprobability, which is achieved when the byte-level FEC scheme is supplemented by the packet-levelFEC scheme.

Author: Azfar Moid and Abraham O. Fapojuwo



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