Analysis of scalability for AODV routing protocol in wireless sensor networks

This paper presents preliminary work to address scalability concern over AODV protocol in wireless sensor network. Firstly, we discussed the scalability design issues with related work in context of wireless sensor networks (WSN). Following, we designed and illustrated wireless sensor network model. Finally, significance of scalability on the behaviour of application, MAC, transport and physical layer performance is described.     

基于有线网络的广电5G集客业务发展机遇分析

本文概述5G时代广电集客业务的发展情况,分析了广电5G 700MHz网络开展集客业务的优势,以及多领域的成功案例,并对广电有线网络公司发挥广电5G优势推动集客业务发展做出了展望.     

我国混合广播产业化发展思路分析

混合广播是传统广播与移动互联网融合发展,以数字广播、移动互联网、云计算、智能终端等技术为支撑的新媒体业务,在国内尚属空白。当前我国正在大力发展广播和新媒体产业,采用产业化的发展方式既可以增强混合广播的生命力,也可以延伸广播产业的价值链。阐述了当前我国混合广播产业化发展的机遇,并就具体的产业化发展思路提出了建议。     

LSI方案机顶盒USB接口设计

介绍了在LSI方案机顶盒E-Bus总线上实现USB接口的设计,包括硬件设计、驱动程序设计及应用开发等.     

直播卫星电视光接收机的研制

光纤接入是直播卫星(DBS)覆盖技术近期发展的热点之一,尤其是用于新一代Ka波段卫星下传的宽带卫星直播电视信号光传输的光发射机与接收机的开发研制更是成为当前研究的重要课题.通过对直播卫星下行信号和光接收机原理的分析,针对光纤宽带接入网的应用特点,设计并研制开发出了一款达到3 GHz带宽,用于接收宽带卫星电视光传输信号,具有较高灵敏度和较大动态范围的模拟光接收机.     

Broadcast and gossip in line-communication mode

This paper addresses the problem of efficiently performing two important operations of communication in networks, namely broadcast and gossip. We study these operations in the line-communication model that is similar to the circuit-switching technique. We propose a simpler proof of the fundamental result, due to A. Farley, that gives the exact broadcast time, log₂ n steps, in any connected network of order n. In the second part we construct gossip algorithms in any tree network and we prove that they are optimal or asymptotically optimal. We finally give a precise idea of the shape of trees in which gossip is possible in log₂ n steps. Finally, we present general results on gossip in any connected graph.     

数字HDTV地面广播传输方法 第一讲系统概述

本文为系列讲座的第一篇，在讨论了美国联邦通信委员会（ＦＣＣ）提出的基本要求和地面广播信道的特点之后，介绍了全数字化ＨＤＴＶ地面广播的传输方案。     

5G广播波束权值优化浅析

5G采用大规模阵列天线设计,结合波束赋形技术,在不同的无线覆盖环境中,可以通过配置不同的广播波束权值,生成不同组合的赋型波束,具有不同的倾角、方位角、水平波宽、垂直波宽,能够满足不同无线环境的覆盖要求,为网络覆盖优化提供了新的思路和手段。文章基于现阶段5G网络技术水平,对广播波束权值方案制定进行了浅析,以MDT数据为核心,制定波束权值匹配方案,以此指导5G网络建设初期的覆盖优化和用户驻留优化工作。     

SMPTE-2110标准4K UHD制作系统内Cisco交换机DCNM管控技术的分析研究

在SMPTE-2110无压缩标准建议下,总台新搭建的4K超高清EFP制作系统已经全面实现网络化和IP数据流化。在这种广电三层结构的IP制作网内由于通用COTS交换机占据了系统核心位置,视、音、辅助数据流的转发成为常态。为了实现对IP业务数据流信号的互通、管理、监控以确保节目生产正常化,网络控制器和广电终端控制器就成为了系统的重要控制核心。本文将主要阐述分析以Cisco通用交换机为系统核心的超高清4K-EFP制作系统中DCNM网络控制器的概念、任务角色和需要部署的安全策略问题,也对未来超高清IP系统中网络控制器的发展做出展望。     

Relating broadcast independence and independence

An independent broadcast on a connected graph $G$ is a function $f:V\left(G\right)\to {\mathbb{N}}_0$ such that, for every vertex $x$ of $G$, the value $f\left(x\right)$ is at most the eccentricity of $x$ in $G$, and $f\left(x\right)>0$ implies that $f\left(y\right)=0$ for every vertex $y$ of $G$ within distance at most $f\left(x\right)$ from $x$. The broadcast independence number ${\alpha }_b\left(G\right)$ of $G$ is the largest weight $\sum _{x\in V\left(G\right)}f\left(x\right)$ of an independent broadcast $f$ on $G$. Clearly, ${\alpha }_b\left(G\right)$ is at least the independence number $\alpha \left(G\right)$ for every connected graph $G$. Our main result implies ${\alpha }_b\left(G\right)\le 4\alpha \left(G\right)$. We prove a tight inequality and characterize all extremal graphs.