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Báo cáo hóa học: "Research Article Energy Efficient Video Transmission over Fast Fading Channels"

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 Energy Efficient Video Transmission over Fast Fading Channels | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID 486302 12 pages doi 10.1155 2010 486302 Research Article Energy Efficient Video Transmission over Fast Fading Channels Dengyu Qiao 1 2 Ye Li 1 2 and Yuwei Zhang1 2 1 Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China 2 Key Laboratory for Biomedical Informatics and Health Engineering Chinese Academy of Sciences Shenzhen 518055 China Correspondence should be addressed to Ye Li ye.li@sub.siat.ac.cn Received 28 September 2009 Revised 1 March 2010 Accepted 19 June 2010 Academic Editor Kameswara Rao Namuduri Copyright 2010 Dengyu Qiao 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. With the explosive development of new generation wireless communication technique the bandwidth is no longer the bottleneck of the wireless video transmission. Energy consumption is the biggest concern now. In this paper an energy-efficient variablerate and variable-power modulation method is proposed which is the optimization of the power and rate of M-QAM signal constellations. Then an adaptive scheme on energy-efficient video transmission over fading channels is proposed. In this scheme in order to satisfy the requirement with energy efficiency and usage of client receiver buffer we implement adaptive selection of modulation level for every video frame and adaptive power control to compensate the effect by fading channels for every packet. Simulation results show this scheme has good performance on energy saving. 1. Introduction Wireless multimedia services which are growing in popularity pose several challenges including overcoming bandwidth variations and limited battery lifetime. While the next-generation wireless technologies promise more reliable communication and .