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Study The Effects Of Video Frames Lost Over Wireless Networks
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Book Synopsis Study the Effects of Video Frames Lost Over Wireless Networks by : Anbarasan Thamizharasan
Download or read book Study the Effects of Video Frames Lost Over Wireless Networks written by Anbarasan Thamizharasan and published by LAP Lambert Academic Publishing. This book was released on 2010-05 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Real Time Video Streaming had taken a prominent role in recent years and had emerged as state of the art technology in the field of Mobile Communications. The advancements in Universal Mobile Telecommunications Systems (UMTS) networks have made it easier to provide a wide variety of multimedia applications that requires robust bandwidth and stable networks. The method of streaming videos is particularly useful in wireless networks since the mobile devices in those wireless networks have limited resources for data storage. However, there is a growing need to share videos in real time as the use of mobile devices increases; mobile devices can receive real time video streams over wireless mobile networks. These would be useful in video conferencing, mobile TV, and the broadcasting of live events. A lot of research is ongoing in the adaptation of present 3G mobile networks to support real-time video streaming services.
Book Synopsis Enhancing the Quality of Video Streaming Over Unreliable Wireless Networks by : Muhammad Usam
Download or read book Enhancing the Quality of Video Streaming Over Unreliable Wireless Networks written by Muhammad Usam and published by . This book was released on 2017 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: Real-time video transmission over unreliable wireless networks remains a serious challenge due to bandwidth limitation and sensitive nature of video bitstreams generated by todayʼs complex video encoders, e.g., High Efficiency Video Coding (HEVC/H.265). These compressed video bitsreams face packet-drop problem when transmitted over unreliable wireless networks. The effect of packet-drop on the received video quality can be minimised in two ways 1) increasing Quality of Service (QoS) by adopting efficient routing schemes between source and destination, and 2) maintaining video quality at receiverʼs side by applying smart and real-time-based Error Concealment (EC) techniques. The QoS refers to the capability of a transmission network to provide better service to selected network traffic. It is a generic term and can be applied to any data transmission network. The term video quality refers to perceived video degradation and is compared to the original video. In this dissertation, we explore the above mentioned two ways and propose a comprehensive solution for real-time video transmission over unreliable networks with the contributions as follows. 1. An efficient, lightweight and real-time EC algorithm is proposed to conceal the missing/lost video frames in H.265 encoded HD videos. The EC algorithm is based on threshold-based distributed Motion Estimation (ME) scheme and utilises only two video frames to estimate the missing one, thus eliminating the need for a large buffer and processing of a bundle of video frames to estimate the missing one. 2. Scalable video coding produces multiple interrelated bitstreams of a single video with different bitrates. For scalable bitstreams, we propose a lightweight and real-time EC algorithm to cover up the effects of missing/lost video frames. Due to complicated nature of scalable video bitstreams, our proposed EC algorithm utilises three previously processed video frames along with their master video frames to perform threshold-based distributed ME to estimate the missing video frames in enhancement layer. 3. We propose a feed-back-based on-demand multipath routing scheme over a multi-hop Wireless Multimedia Sensor Network (WMSN) to ensure the QoS. The feedback helps in deciding the optimum path between sources and destinations and reduces the Packets Loss Ratio (PLR) during the transmissions. On-demand connection assists in saving the available network resources while multipath routing aids in maintaining the connection between sources and destinations. The proposed research makes notable contributions to designing a QoS-supported HD video streaming paradigm to deliver HD videos over unreliable networks and to maintain the received video quality on resource-constrained mobile terminals.
Book Synopsis Interactive Distributed Multimedia Systems and Telecommunication Services by : Michel Diaz
Download or read book Interactive Distributed Multimedia Systems and Telecommunication Services written by Michel Diaz and published by Springer Science & Business Media. This book was released on 2007-07-23 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 1999 International Workshop on Interactive Distributed Multimedia Sys tems and Telecommunication Services (IDMS) in Toulouse is the sixth in a se ries that started in 1992. The previous workshops were held in Stuttgart in 1992, Hamburg in 1994, Berlin in 1996, Darmstadt in 1997, and Oslo in 1998. The area of interest of IDMS ranges from basic system technologies, such as networking and operating system support, to all kinds of teleservices and distributed multimedia applications. Technical solutions for telecommunications and distributed multimedia systems are merging and quality-of-service (QoS) will play a key role in both areas. However, the range from basic system tech nologies to distributed mutlimedia applications and teleservices is still very broad and we have to understand the implications of multimedia applications and their requirements for middleware and networks. We are challenged to develop new and more fitting solutions for all distributed multimedia systems and telecom munication services to meet the requirements of the future information society.
Book Synopsis 4G Wireless Video Communications by : Haohong Wang
Download or read book 4G Wireless Video Communications written by Haohong Wang and published by John Wiley & Sons. This book was released on 2009-06-15 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive presentation of the video communication techniques and systems, this book examines 4G wireless systems which are set to revolutionise ubiquitous multimedia communication.4G Wireless Video Communications covers the fundamental theory and looks at systems’ descriptions with a focus on digital video. It addresses the key topics associated with multimedia communication on 4G networks, including advanced video coding standards, error resilience and error concealment techniques, as well as advanced content-analysis and adaptation techniques for video communications, cross-layer design and optimization frameworks and methods. It also provides a high-level overview of the digital video compression standard MPEG-4 AVC/H.264 that is expected to play a key role in 4G networks. Material is presented logically allowing readers to turn directly to specific points of interest. The first half of the book covers fundamental theory and systems, while the second half moves onto advanced techniques and applications. This book is a timely reflection of the latest advances in video communications for 4G wireless systems. One of the first books to study the latest video communications developments for emerging 4G wireless systems Considers challenges and techniques in video delivery over 4G wireless systems Examines system architecture, key techniques and related standards of advanced wireless multimedia applications Written from both the perspective of industry and academia
Book Synopsis Multimedia Transcoding in Mobile and Wireless Networks by : Ahmad, Ashraf M.A.
Download or read book Multimedia Transcoding in Mobile and Wireless Networks written by Ahmad, Ashraf M.A. and published by IGI Global. This book was released on 2008-07-31 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book is designed to provide readers with relevant theoretical frameworks and latest technical and institutional solutions for transcoding multimedia in mobile and wireless networks"--Provided by publisher.
Book Synopsis Advanced Video Communications over Wireless Networks by : Ce Zhu
Download or read book Advanced Video Communications over Wireless Networks written by Ce Zhu and published by CRC Press. This book was released on 2013-01-07 with total page 523 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wireless video communications encompass a broad range of issues and opportunities that serve as the catalyst for technical innovations. To disseminate the most recent advances in this challenging yet exciting field, Advanced Video Communications over Wireless Networks provides an in-depth look at the fundamentals, recent technical achievements, challenges, and emerging trends in mobile and wireless video communications. The editors have carefully selected a panel of researchers with expertise in diverse aspects of wireless video communication to cover a wide spectrum of topics, including the underlying theoretical fundamentals associated with wireless video communications, the transmission schemes tailored to mobile and wireless networks, quality metrics, the architectures of practical systems, as well as some novel directions. They address future directions, including Quality-of-Experience in wireless video communications, video communications over future networks, and 3D video communications. The book presents a collection of tutorials, surveys, and original contributions, providing an up-to-date, accessible reference for further development of research and applications in mobile and wireless video communication systems. The range of coverage and depth of expertise make this book the go-to resource for facing current and future challenges in this field.
Book Synopsis Passive and Active Network Measurement by : Constantinos Dovrolis
Download or read book Passive and Active Network Measurement written by Constantinos Dovrolis and published by Springer Science & Business Media. This book was released on 2005-03-21 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 6th International Workshop on Passive and Active Measurement, PAM 2005, held in Boston, MA, USA in March/April 2005. The 24 revised full papers and 12 revised short papers presented were carefully reviewed and selected from 84 submissions. The papers are organized in topical sections on TCP measurements, application measurements, network inference and problem diagnosis, topology measurements, wireless network measurements, monitoring facilities, routing and traffic engineering measurements, and spectroscopy and bandwidth estimation.
Book Synopsis Quality of Service Architectures for Wireless Networks: Performance Metrics and Management by : Adibi, Sasan
Download or read book Quality of Service Architectures for Wireless Networks: Performance Metrics and Management written by Adibi, Sasan and published by IGI Global. This book was released on 2010-01-31 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book further explores various issues and proposed solutions for the provision of Quality of Service (QoS) on the wireless networks"--Provided by publisher.
Book Synopsis Simulated Evolution and Learning by : Grant Dick
Download or read book Simulated Evolution and Learning written by Grant Dick and published by Springer. This book was released on 2014-11-11 with total page 877 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume constitutes the proceedings of the 10th International Conference on Simulated Evolution and Learning, SEAL 2012, held in Dunedin, New Zealand, in December 2014. The 42 full papers and 29 short papers presented were carefully reviewed and selected from 109 submissions. The papers are organized in topical sections on evolutionary optimization; evolutionary multi-objective optimization; evolutionary machine learning; theoretical developments; evolutionary feature reduction; evolutionary scheduling and combinatorial optimization; real world applications and evolutionary image analysis.
Book Synopsis 5G for Future Wireless Networks by : Keping Long
Download or read book 5G for Future Wireless Networks written by Keping Long and published by Springer. This book was released on 2017-12-31 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the proceedings of the First International Conference on 5G for Future Wireless Networks, 5GWN 2017, held in Beijing, China, in April 2017. The 64 full papers were selected from 135 submissions and present the state of the art and practical applications of 5G technologies. The exponentially growing data traffic caused by the development of mobile Internet and smart phones requires powerful networks. The fifth generation (5G) techniques are promising to meet the requirements of this explosive data traffic in future mobile communications.
Book Synopsis Management of Speech and Video Telephony Quality in Heterogeneous Wireless Networks by : Błażej Lewcio
Download or read book Management of Speech and Video Telephony Quality in Heterogeneous Wireless Networks written by Błażej Lewcio and published by Springer Science & Business Media. This book was released on 2013-11-20 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book shows how networking research and quality engineering can be combined to successfully manage the transmission quality when speech and video telephony is delivered in heterogeneous wireless networks. Nomadic use of services requires intelligent management of ongoing transmission, and to make the best of available resources many fundamental trade-offs must be considered. Network coverage versus throughput and reliability of a connection is one key aspect, efficiency versus robustness of signal compression is another. However, to successfully manage services, user-perceived Quality of Experience (QoE) in heterogeneous networks must be known, and the perception of quality changes must be understood. These issues are addressed in this book, in particular focusing on the perception of quality changes due to switching between diverse networks, speech and video codecs, and encoding bit rates during active calls.
Book Synopsis Mobile Multimedia Broadcasting Standards by : Fa-Long Luo
Download or read book Mobile Multimedia Broadcasting Standards written by Fa-Long Luo and published by Springer Science & Business Media. This book was released on 2008-11-06 with total page 671 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mobile multimedia broadcasting compasses a broad range of topics including radio propagation, modulation and demodulation, error control, signal compression and coding, transport and time slicing, system on chip real-time implementation in ha- ware, software and system levels. The major goal of this technology is to bring multimedia enriched contents to handheld devices such as mobile phones, portable digital assistants, and media players through radio transmission or internet pro- col (IP) based broadband networks. Research and development of mobile multi- dia broadcasting technologies are now explosively growing and regarded as new killer applications. A number of mobile multimedia broadcasting standards related to transmission, compression and multiplexing now coexist and are being ext- sively further developed. The development and implementation of mobile multi- dia broadcasting systems are very challenging tasks and require the huge efforts of the related industry, research and regulatory authorities so as to bring the success. From an implementation design and engineering practice point of view, this book aims to be the ?rst single volume to provide a comprehensive and highly coherent treatment for multiple standards of mobile multimedia broadcasting by covering basic principles, algorithms, design trade-off, and well-compared implementation system examples. This book is organized into 4 parts with 22 chapters.
Book Synopsis IAENG Transactions on Engineering Technologies by : Haeng Kon Kim
Download or read book IAENG Transactions on Engineering Technologies written by Haeng Kon Kim and published by Springer Science & Business Media. This book was released on 2012-09-05 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains thirty revised and extended research articles written by prominent researchers participating in an international conference in engineering technologies and physical science and applications. The conference serves as good platforms for the engineering community to meet with each other and to exchange ideas. The conference has also struck a balance between theoretical and application development. The conference is truly international meeting with a high level of participation from many countries. Topics covered include chemical engineering, circuits, communications systems, control theory, engineering mathematics, systems engineering, manufacture engineering, and industrial applications. The book offers the state of art of tremendous advances in engineering technologies and physical science and applications, and also serves as an excellent reference work for researchers and graduate students working with/on engineering technologies and physical science and applications.
Book Synopsis Adaptive Wireless Video Streaming and Teleconferencing by : Wei Chen
Download or read book Adaptive Wireless Video Streaming and Teleconferencing written by Wei Chen and published by . This book was released on 2017 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the popularity of and the advances in wireless networking technologies, wireless multimedia tra c has grown dramatically in recent years. Despite having many advantages, wireless multimedia services, particularly video services, still pose a number of challenges due to the time-varying, error-prone and bandwidth-fluctuating channels in the wireless networks. Therefore, provisioning end-to-end Quality of Service and Quality of Experience (QoS and QoE) of video transmission over wireless channels is of great importance. ☐ Video transmission is often described to be bursty as video is basically a sequence of frames transmitted at a particular frame rate. A video frame cannot be decoded or played out at the receiver side until all or most of its transmitted constituent packets are received in time. Depending on the application scenarios, video services may have different emphases in terms of QoE and QoS. While video streaming (e.g., Netflix and YouTube) allows for modest delay (on the order of a few seconds) at the beginning of the playout, video teleconferencing (e.g., FaceTime and WebRTC) is much more delay constrained (less than a few hundred milliseconds). This is because in real-time video systems, each frame must be delivered and decoded by its playback time, and any packet that is retransmitted due to loss in the last transmission or arriving late becomes useless when its stringent decoding and display deadline cannot be met. In this dissertation, we propose several optimization algorithms to improve the QoE and QoS for both video streaming (non real-time) and video teleconferencing (real-time) over wireless networks. ☐ In optimizing wireless video streaming, we focus on MPEG-DASH (ISO/IEC Standard 23009-1), the current standard for video streaming. We optimize video streaming by leveraging a technique called User Adaptive Video (UAV), which exploits the perceptual limits of the human visual system to modulate a video stream’s bit rate based on the viewing conditions, such as viewing distance and ambient illuminance, resulting in significant bandwidth saving without perceived loss of quality to the user. UAV presents an opportunity to significantly improve the e ciency of DASH by not requesting unnecessarily high bit rate videos. We design UAV-enabled DASH (UDASH) and evaluate its performance in Wi-Fi networks. Simulation results show that UDASH in a Wi-Fi network has the benefits of not only significantly improving the video streaming performance such as reducing the rebu ering probability, but also enhancing the performance of cross traffc. ☐ In addition, the MPEG-DASH standard uses TCP as the underlying transport layer protocol, and more importantly, TCP is one type of dominant tra c in the Internet. Therefore, we investigate how to improve TCP performance in wireless networks. We identify two issues of TCP performance degradation due to common channel errors via both analytical study and simulations in a typical Wi-Fi network. Motivated by these issues, a MAC layer optimization technique is proposed, which is based on the adaptation of the Retry Limit parameter after considering TCP traffic characteristics and throughput model. The evaluation results confirm that the proposed technique achieves higher performance gain. ☐ In optimizing video teleconferencing, we considerWebRTC, which is Google’s open source real-time communication framework. In wireless networks such as those based on IEEE 802.11, packet losses due to fading and interference are often misinterpreted as indications of congestion, causing unnecessary decrease in the data sending rate due to congestion control by the RTCP protocol working beneath WebRTC and above RTP. For delayconstrained applications such as video teleconferencing, packet losses may result in excessive artifacts or freeze in the decoded video. We propose a simple and yet effective mechanism to detect and reduce channel-caused packet losses by dynamically adjusting the retry limit parameter of the IEEE 802.11 protocol. Since the retry limit is left configurable in the IEEE 802.11 standard, and does not require cross-layer coordination, the proposed scheme can be easily implemented and incrementally deployed. We also propose to use a delay constrained retry limit adaptation algorithm to control transmission delays so that delay constraints required by different application scenarios can be met. Experimental results of applying the proposed scheme to aWebRTC based real-time video communication prototype show significant performance gain compared to the case where retry limit is configured statically. ☐ In addition to the optimization techniques proposed for the IEEE 802.11 protocol, we also propose a cross-layer approach to optimize video teleconferencing, termed early packet loss feedback (EPLF). In EPLF, if a packet loss is due to channel errors, the MAC layer directly feeds back the loss information to the RTP layer with a spoofed RTCP packet that carries a NACK message so that the RTP layer can retransmit the lost RTP packet. Since the whole feedback process takes place in the same device (the video sender), the latency is negligible in relation to the RTT, and hence the term ’early’ in EPLF. Theoretical analysis and prototype-based experimental results show that EPLF almost completely eliminates channelcaused video freezes in the decoded video while improving congestion control. ☐ Furthermore, we also apply the technique of UAV to video teleconferencing to further reduce bandwidth consumption, and build a prototype based on WebRTC and Licode (a video teleconferencing hub platform) to validate the bandwidth savings.
Book Synopsis Media and Radio Signal Processing for Mobile Communications by : Kyunghun Jung
Download or read book Media and Radio Signal Processing for Mobile Communications written by Kyunghun Jung and published by Cambridge University Press. This book was released on 2018-04-19 with total page 497 pages. Available in PDF, EPUB and Kindle. Book excerpt: A unique, top-down treatment of the principles and practice of signal processing used in real mobile communications systems.
Book Synopsis Networks, The Proceedings Of The Joint International Conference On Wireless Lans And Home Networks (Icwlhn 2002) & Networking (Icn 2002) by : Benny Bing
Download or read book Networks, The Proceedings Of The Joint International Conference On Wireless Lans And Home Networks (Icwlhn 2002) & Networking (Icn 2002) written by Benny Bing and published by World Scientific. This book was released on 2002-08-08 with total page 793 pages. Available in PDF, EPUB and Kindle. Book excerpt: The joint conference, ICWLHN 2002 and ICN 2002, covers a wide variety of technical sessions covering all aspects of networking technology. It features some of the world's most dynamic presenters, including leading experts such as Norman Abramson (inventor of the first access protocol — the ALOHA protocol) and Daniel Awduche (pioneer of the MPLambdaS concept, now referred to as GMPLS). The proceedings for this joint conference is accessible to engineers, practitioners, scientists, as well as industry professionals from manufacturers to service providers.
Book Synopsis Issues in Networks Research and Application: 2011 Edition by :
Download or read book Issues in Networks Research and Application: 2011 Edition written by and published by ScholarlyEditions. This book was released on 2012-01-09 with total page 717 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues in Networks Research and Application: 2011 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Networks Research and Application. The editors have built Issues in Networks Research and Application: 2011 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Networks Research and Application in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Networks Research and Application: 2011 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
