Research And Implementation Of Multi-View Video Transmission System Based On Network Coding

From voice business,to multimedia business,to short video entertainment,people's entertainment demand is gradually improving,with the rapid development of mobile Internet,such as the popularization of 4G and the construction of 5G.With the development of VR technology,emerging video formats such as multi-view video begin to enter people's perspective.Multi-view video can provide immersive viewing experience.However,the requirements on transfer rate and network bandwidth are further improving.In addition,as a result of poor signal and bandwidth competition between devices,the video viewing experience is always poor in crowded places such as railway station,bus and subway.The contradiction between supply and demand above curbs the popularization and development of multi-view video.The traditional stream media service is based on HTTP but does not make full use of the multi-interface features and computing ability of mobile phone.In this paper,we propose a device-to-device D2D(Devide-To-Device)collaborative downloading system based on Wi-Fi Direct to solve the problem of large amount of multi-view video data and network competition among users.At the same time,in order to improve the availability of system and support the reconstruction of network,a distributed scheduling center is introduced.In addition,the scheduling center is also responsible for scheduling user.When user group changes dynamically,the scheduling center will also redistribute the current download tasks to ensure the scalability of system.In order to avoid congestion between groups,the scheduling center also makes the devices to send data in turn to avoid packet loss during data transmission.In addition to the introduction of scheduling center,we also apply network coding to improve the efficiency of system.With the development of science and technology,the computing ability of mobile phone is rapidly increasing.The intelligent terminal is not only limited to the traditional telecommunication service,but also can perform CPU-intensive work such as image recognition and offline voice recognition.Through encoding and decoding on mobile,the system throughput can be further improved,which will provide better Quality of Experience.The throughput of the multi-view video transmission system is improved by using network coding technology.This paper proposes a multi-view video transmission system based on network coding,called Schedule Video System Based On Network Coding(NCSV for short).Experiments show that NCSV,compared with the existing system,can not only improve the download speed,but also reduce the client's traffic consumption and the server's load pressure.