Báo cáo hóa học: " Research Article Unequal Protection of Video Streaming through Adaptive Modulation with a Trizone Buffer over Bluetooth Enhanced Data Rate"

Tham khảo luận văn - đề án 'báo cáo hóa học: " research article unequal protection of video streaming through adaptive modulation with a trizone buffer over bluetooth enhanced data rate"', luận văn - báo cáo phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 658794 16 pages doi 2008 658794 Research Article Unequal Protection of Video Streaming through Adaptive Modulation with a Trizone Buffer over Bluetooth Enhanced Data Rate Rouzbeh Razavi Martin Fleury and Mohammed Ghanbari Electronic Systems Engineering Department University of Essex Wivenhoe Park Colchester CO4 3SQ UK Correspondence should be addressed to Martin Fleury fleum@ Received 1 March 2007 Revised 12 July 2007 Accepted 14 October 2007 Recommended by Peter Schelkens Bluetooth enhanced data rate wireless channel can support higher-quality video streams compared to previous versions of Bluetooth. Packet loss when transmitting compressed data has an effect on the delivered video quality that endures over multiple frames. To reduce the impact of radio frequency noise and interference this paper proposes adaptive modulation based on content type at the video frame level and content importance at the macroblock level. Because the bit rate of protected data is reduced the paper proposes buffer management to reduce the risk of buffer overflow. A trizone buffer is introduced with a varying unequal protection policy in each zone. Application of this policy together with adaptive modulation results in up to 4 dB improvement in objective video quality compared to fixed rate scheme for an additive white Gaussian noise channel and around 10 dB for a Gilbert-Elliott channel. The paper also reports a consistent improvement in video quality over a scheme that adapts to channel conditions by varying the data rate without accounting for the video frame packet type or buffer congestion. Copyright 2008 Rouzbeh Razavi 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 .

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