tailieunhanh - Báo cáo hóa học: "Research Article Intelligent Stale-Frame Discards for Real-Time Video Streaming over Wireless Ad Hoc Networks"

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 Intelligent Stale-Frame Discards for Real-Time Video Streaming over Wireless Ad Hoc Networks | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID 486165 10 pages doi 2009 486165 Research Article Intelligent Stale-Frame Discards for Real-Time Video Streaming over Wireless Ad Hoc Networks Tsang-Ling Sheu and Yung-Shih Chi Center for Wireless Multimedia Communications Department of Electrical Engineering National Sun Yat-Sen University 80424 Kaohsiung Taiwan Correspondence should be addressed to Tsang-Ling Sheu sheu@ Received 28 November 2008 Revised 24 June 2009 Accepted 24 August 2009 Recommended by Kameswara Namuduri This paper presents intelligent early packet discards I-EPD for real-time video streaming over a multihop wireless ad hoc network. In a multihop wireless ad hoc network the quality of transferring real-time video streams could be seriously degraded since every intermediate node IN functionally like relay device does not possess large buffer and sufficient bandwidth. Even worse a selected relay node could leave or power off unexpectedly which breaks the route to destination. Thus a stale video frame is useless even if it can reach destination after network traffic becomes smooth or failed route is reconfigured. In the proposed I-EPD an IN can intelligently determine whether a buffered video packet should be early discarded. For the purpose of validation we implement the I-EPD on Linux-based embedded systems. Via the comparisons of performance metrics packet frame discards ratios PSNR etc. we demonstrate that video quality over a wireless ad hoc network can be substantially improved and unnecessary bandwidth wastage is greatly reduced. Copyright 2009 . Sheu and . Chi. 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 increasing popularity of wireless mobile devices such as .