TAILIEUCHUNG - Báo cáo hóa học: " Research Article A Cross-Layer Approach for Maximizing Visual Entropy Using Closed-Loop Downlink MIMO"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article A Cross-Layer Approach for Maximizing Visual Entropy Using Closed-Loop Downlink MIMO | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 864606 14 pages doi 2008 864606 Research Article A Cross-Layer Approach for Maximizing Visual Entropy Using Closed-Loop Downlink MIMO Hyungkeuk Lee Sungho Jeon and Sanghoon Lee Wireless Network Laboratory Yonsei University Seoul 120-749 South Korea Correspondence should be addressed to Sanghoon Lee slee@ Received 1 October 2007 Revised 27 March 2008 Accepted 8 May 2008 Recommended by David Bull We propose an adaptive video transmission scheme to achieve unequal error protection in a closed loop multiple input multiple output MIMO system for wavelet-based video coding. In this scheme visual entropy is employed as a video quality metric in agreement with the human visual system HVS and the associated visual weight is used to obtain a set of optimal powers in the MIMO system for maximizing the visual quality of the reconstructed video. For ease of cross-layer optimization the video sequence is divided into several streams and the visual importance of each stream is quantified using the visual weight. Moreover an adaptive load balance control named equal termination scheduling ETS is proposed to improve the throughput of visually important data with higher priority. An optimal solution for power allocation is derived as a closed form using a Lagrangian relaxation method. In the simulation results a highly improved visual quality is demonstrated in the reconstructed video via the cross-layer approach by means of visual entropy. Copyright 2008 Hyungkeuk Lee 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. 1. INTRODUCTION The ongoing broadband wireless networks have attractive advantages for providing a variety of multimedia streaming applications while guaranteeing the quality of .

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