In DVB-IPDC system, due to the constraints of handheld devices and the broadcast nature of wireless network, packet loss is inevitable. ECDR-NC proposed is a retransmission encoding packet selection algorithm based on...In DVB-IPDC system, due to the constraints of handheld devices and the broadcast nature of wireless network, packet loss is inevitable. ECDR-NC proposed is a retransmission encoding packet selection algorithm based on the dynamic information updating, which can find the current most effective complete decoding packet. ECDR-NC can not only avoid the redundant encoding packets due to the overlapping among encoding packets, but also reduce the computational complexity compared with the traditional encoding schemes. Furthermore, the retransmission upper bound of ECDR-NC is fully controlled. In time-sensitive applications, to maximize the aggregate number of recovery packets while minimizing the total number of discarded packets due to the time limit according to the priority preference, the adaptive priority scheme EPNC is formulized, and the weighted relation graph is constructed to find the maximum-weighted encoding packets sequence according to the decoding gains. In the same network environment, the performances comparisons between PNC and EPNC show that EPNC is more efficient and more rational, and the average discarded packets ratios ofEPNC can be reduced about 18%~27%. The main contributions of this paper are an effective retransmission encoding packet selection algorithm ECDR-NC proposed, and a new adaptive priority recovery scheme EPNC introduced into DVB-IPDC system.展开更多
江苏省广电有线信息网络股份有限公司无锡分公司设计了一套基于数字视频广播(Digital Video Broadcast,DVB)+网际互连协议(Internet Protocol,IP)的数字电视全业务融合播出平台模型。在此基础上,根据项目部署地的实际需求,设计并完成项...江苏省广电有线信息网络股份有限公司无锡分公司设计了一套基于数字视频广播(Digital Video Broadcast,DVB)+网际互连协议(Internet Protocol,IP)的数字电视全业务融合播出平台模型。在此基础上,根据项目部署地的实际需求,设计并完成项目一期工程的数字电视前端系统。详细介绍全系统包含卫星电视节目的信号接收、无锡地区电视节目的 IP传输、自办节目播出、电子节目单(Electrical Program Guide,EPG)开机广告、信号复用、信号调制以及信号分配等功能。展开更多
为提高地面数字电视广播(DVB-T)接收机的实现灵活性,基于由通用软件无线电外设(Universal Software Radio Peripheral,USRP)和通用计算机组成的软件无线电平台,实现DVB-T接收机。接收机以USRP作为射频前端,在通用计算机中完成全部基带...为提高地面数字电视广播(DVB-T)接收机的实现灵活性,基于由通用软件无线电外设(Universal Software Radio Peripheral,USRP)和通用计算机组成的软件无线电平台,实现DVB-T接收机。接收机以USRP作为射频前端,在通用计算机中完成全部基带信号处理、视频解码与显示等。测试结果表明,接收机可实现对DVB-T信号的接收,为接收机算法开发、验证与评估提供了更为灵活的方法。展开更多
构建IPv6 over DVB体系框架,可以在下一代互联网中利用卫星等广播信道实施远程教育。该体系框架包括"支持IPv6的教育资源管理与发布系统"、"IPv6 over DVB传输系统"以及"IPv6 over DVB在远程教育中的应用示范&...构建IPv6 over DVB体系框架,可以在下一代互联网中利用卫星等广播信道实施远程教育。该体系框架包括"支持IPv6的教育资源管理与发布系统"、"IPv6 over DVB传输系统"以及"IPv6 over DVB在远程教育中的应用示范"3个部分。实现了将IPv6互联网中的教育资源通过卫星链路发布到目前尚无网络覆盖的1000所农牧村中小学。给出了设计方案和部署策略。展开更多
IP over DVB-S是基于卫星实现IP数据广播的关键技术,在远程教育等领域广泛应用.ULE封装协议相比传统MPE协议更加简练、高效,对IP网络支持更好.设计了IP over DVB-S接收系统,并对其在Linux中实现时的关键技术予以介绍.该系统具有兼容ULE/...IP over DVB-S是基于卫星实现IP数据广播的关键技术,在远程教育等领域广泛应用.ULE封装协议相比传统MPE协议更加简练、高效,对IP网络支持更好.设计了IP over DVB-S接收系统,并对其在Linux中实现时的关键技术予以介绍.该系统具有兼容ULE/MPE两种封装方式、支持IPv4/IPv6双协议的特点,在实际环境中进行了部署.展开更多
基金supported by the National High Technology Research and Development Program of China(863 Program )(Grant No: 2015AA01A705)the National Basic Research Program of China (Grant No:2012CB316100)+1 种基金Key Grant Project of Chinese Ministry of Education (Grant No:311031 100)Young Innovative Research Team of Sichuan Province (Grant No:2011JTD0007)
文摘In DVB-IPDC system, due to the constraints of handheld devices and the broadcast nature of wireless network, packet loss is inevitable. ECDR-NC proposed is a retransmission encoding packet selection algorithm based on the dynamic information updating, which can find the current most effective complete decoding packet. ECDR-NC can not only avoid the redundant encoding packets due to the overlapping among encoding packets, but also reduce the computational complexity compared with the traditional encoding schemes. Furthermore, the retransmission upper bound of ECDR-NC is fully controlled. In time-sensitive applications, to maximize the aggregate number of recovery packets while minimizing the total number of discarded packets due to the time limit according to the priority preference, the adaptive priority scheme EPNC is formulized, and the weighted relation graph is constructed to find the maximum-weighted encoding packets sequence according to the decoding gains. In the same network environment, the performances comparisons between PNC and EPNC show that EPNC is more efficient and more rational, and the average discarded packets ratios ofEPNC can be reduced about 18%~27%. The main contributions of this paper are an effective retransmission encoding packet selection algorithm ECDR-NC proposed, and a new adaptive priority recovery scheme EPNC introduced into DVB-IPDC system.
文摘江苏省广电有线信息网络股份有限公司无锡分公司设计了一套基于数字视频广播(Digital Video Broadcast,DVB)+网际互连协议(Internet Protocol,IP)的数字电视全业务融合播出平台模型。在此基础上,根据项目部署地的实际需求,设计并完成项目一期工程的数字电视前端系统。详细介绍全系统包含卫星电视节目的信号接收、无锡地区电视节目的 IP传输、自办节目播出、电子节目单(Electrical Program Guide,EPG)开机广告、信号复用、信号调制以及信号分配等功能。
文摘为提高地面数字电视广播(DVB-T)接收机的实现灵活性,基于由通用软件无线电外设(Universal Software Radio Peripheral,USRP)和通用计算机组成的软件无线电平台,实现DVB-T接收机。接收机以USRP作为射频前端,在通用计算机中完成全部基带信号处理、视频解码与显示等。测试结果表明,接收机可实现对DVB-T信号的接收,为接收机算法开发、验证与评估提供了更为灵活的方法。
文摘构建IPv6 over DVB体系框架,可以在下一代互联网中利用卫星等广播信道实施远程教育。该体系框架包括"支持IPv6的教育资源管理与发布系统"、"IPv6 over DVB传输系统"以及"IPv6 over DVB在远程教育中的应用示范"3个部分。实现了将IPv6互联网中的教育资源通过卫星链路发布到目前尚无网络覆盖的1000所农牧村中小学。给出了设计方案和部署策略。
文摘IP over DVB-S是基于卫星实现IP数据广播的关键技术,在远程教育等领域广泛应用.ULE封装协议相比传统MPE协议更加简练、高效,对IP网络支持更好.设计了IP over DVB-S接收系统,并对其在Linux中实现时的关键技术予以介绍.该系统具有兼容ULE/MPE两种封装方式、支持IPv4/IPv6双协议的特点,在实际环境中进行了部署.
