Joint Video Summarization and Transmission Adaptation for Energy-Efficient Wireless Video Streaming
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Research Article Joint Video Summarization and Transmission Adaptation for Energy-Efficient Wireless Video Streaming Zhu Li,1 Fan Zhai,2 and Aggelos K. Katsaggelos3 1 Department
of Computing, Hong Kong Polytechnic University, Kowloon, Hong Kong Systems, ASP, Texas Instruments Inc., Dallas, TX 75243, USA 3 Department of Electrical Engineering & Computer Science (EECS), Northwestern University, Evanston, IL 60208, USA 2 DSP
Correspondence should be addressed to Zhu Li, [email protected] Received 13 October 2007; Accepted 25 February 2008 Recommended by Jianfei Cai The deployment of the higher data rate wireless infrastructure systems and the emerging convergence of voice, video, and data services have been driving various modern multimedia applications, such as video streaming and mobile TV. However, the greatest challenge for video transmission over an uplink multiaccess wireless channel is the limited channel bandwidth and battery energy of a mobile device. In this paper, we pursue an energy-efficient video communication solution through joint video summarization and transmission adaptation over a slow fading wireless channel. Video summarization, coding and modulation schemes, and packet transmission are optimally adapted to the unique packet arrival and delay characteristics of the video summaries. In addition to the optimal solution, we also propose a heuristic solution that has close-to-optimal performance. Operational energy efficiency versus video distortion performance is characterized under a summarization setting. Simulation results demonstrate the advantage of the proposed scheme in energy efficiency and video transmission quality. Copyright © 2008 Zhu Li 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.
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INTRODUCTION
The rapid increase in channel bandwidth brought about by new technologies such as the present third-generation (3G), the emerging fourth-generation (4G) wireless systems, and the IEEE 802.11 WLAN standards is enabling video streaming in personal communications and driving a wide range of modern multimedia applications such as video telephony and mobile TV. However, transmitting video over wireless channels from mobile devices still faces some unique challenges. Due to the shadowing and multipath effect, the channel gain varies over time, which makes reliable signaling difficult. On the other hand, a major limitation in any wireless system is the fact that mobile devices typically depend on a battery with a limited energy supply. Such a limitation is especially of concern because of the high energy consumption rate for encoding and transmitting video bit streams. Therefore, how to achieve reliable video communications over a fading channel with energy efficiency is crucial for the wide deployment of wireless video-based applications.
Energy-efficient wireless communications is a widely studied topic. For example, a simple scheme i
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