ICIP 2006, Atlanta, GA
 

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Paper Detail

Paper:MP-L6.2
Session:Network-Aware Multimedia Processing and Communications
Time:Monday, October 9, 14:40 - 15:00
Presentation: Special Session Lecture
Topic: Special Sessions: Network-aware multimedia processing and communications
Title: OPTIMAL UNEQUAL ERROR PROTECTION WITH USER COOPERATION FOR TRANSMISSION OF EMBEDDED SOURCE-CODED IMAGES
Authors: Andres Kwasinski; University of Maryland 
 K. J. Ray Liu; University of Maryland 
Abstract: This paper studies the transmission of images encoded using an embedded source encoder over a wireless network allowing user cooperation. A dynamic programming algorithm is applied to optimally allocate to each source coded packet error protection in the form of a choice of channel code and a decision on the use of cooperation. The results show that for degraded source-destination channels, the use of user cooperation on all source coded packets significantly improves the reconstructed quality. As the source-destination channel improves the optimal policy becomes a hybrid that uses user cooperation only for the most important source packets. When the source destination channel is sufficiently good, all source packets are sent without cooperation. Thus, a test is presented to estimate the channels states when cooperation is first used.