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Báo cáo hóa học: " Research Article A Transparent Loss Recovery Scheme Using Packet Redirection for Wireless Video Transmissions"

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 Transparent Loss Recovery Scheme Using Packet Redirection for Wireless Video Transmissions | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 437128 15 pages doi 10.1155 2008 437128 Research Article A Transparent Loss Recovery Scheme Using Packet Redirection for Wireless Video Transmissions Chi-Huang Shih 1 Ce-Kuen Shieh 1 and Wen-Shyang Hwang2 1 Department of Electrical Engineering National Cheng Kung University Tainan 701 Taiwan 2 Department of Electrical Engineering National Kaohsiung University of Applied Sciences Kaohsiung 807 Taiwan Correspondence should be addressed to Chi-Huang Shih chshih@hpds.ee.ncku.edu.tw Received 1 October 2007 Revised 14 February 2008 Accepted 17 March 2008 Recommended by F. Babich With the wide deployment of wireless networks and the rapid integration of various emerging networking technologies nowadays Internet video applications must be updated on a sufficiently timely basis to support high end-to-end quality of service QoS levels over heterogeneous infrastructures. However updating the legacy applications to provide QoS support is both complex and expensive since the video applications must communicate with underlying architectures when carrying out QoS provisioning and furthermore should be both aware of and adaptive to variations in the network conditions. Accordingly this paper presents a transparent loss recovery scheme to transparently support the robust video transmission on behalf of real-time streaming video applications. The proposed scheme includes the following two modules i a transparent QoS mechanism which enables the QoS setup of video applications without the requirement for any modification of the existing legacy applications through its use of an efficient packet redirection scheme and ii an instant frame-level FEC technique which performs online FEC bandwidth allocation within TCP-friendly rate constraints in a frame-by-frame basis to minimize the additional FEC processing delay. The experimental results show that the proposed scheme achieves nearly .