CHANNEL MODELING AND ITS EFFECT ON THE END-TO-END DISTORTION IN WIRELESS VIDEO COMMUNICATIONS (WP-P2)

Author(s) : Eren Soyak (Ingenient Technologies, USA) Yiftach Eisenberg (Northwestern University, USA) Fan Zhai (Northwestern University, USA) Randall Berry (Northwestern University, USA) Thrasyvoulos Pappas (Northwestern University, USA) Aggelos Katsaggelos (Northwestern University, USA)

Abstract : A major limitation faced by a mobile user is their dependence on a limited battery supply. For wireless video communications, joint source coding and transmission power management (JSCPM) has recently been considered as a means of efficiently allocating transmission energy. In order to reduce complexity, simplified channel models are sometimes utilized to design these adaptive resource allocation algorithms. In this paper, we analyze the effects of channel modeling on the end-to-end distortion. We present a useful channel model, based on information theoretic considerations, which captures the bursty nature of wireless channels and accounts for packet lengths when calculating the probability of loss. Given the source coding and transmission parameters derived using one channel model, our goal is to analyze how the end-to-end distortion is affected when another more complex channel model is used to simulate losses. Experimental results suggest that the performance gains of JSCPM predicted using a simpler channel model also hold under more sophisticated channel simulations. To improve performance, several suggestions are made that address the complex channel characteristics of wireless channels.

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