无线变有线 巧为老电视升级Wi-Fi

正前几年购买的Android网络电视大多没有Wi-Fi功能,如果要配备无线网卡,我们就必须购买特定型号的专用无线网卡,这给老电视的Wi-Fi升级带来不便。其实现在的无线路由器都支持WDS无线扩展技术,我们可以利用无线路由器接收上一级的Wi-Fi,然后再借助网线就可以让老电视实现无线上网了。这里我们以水星MW305R路由器设置为例。首先要确认主路由LAN口的IP地址,为了描述方便这里假设主路由为A,使     

用电脑管理手机文件

正Q:不知道是电脑方面的原因,还是手机方面的原因,最近无法使用数据线将手机与电脑正常连接。请问,在不用数据线的情况下,如何方便地管理Android手机中的文件?A:你可以通过Wi-Fi无线信号进行手机的文件管理,例如WiFi File Explorer(下载地址:http://tinyurl.com/bodva6q),在手机中安装该客户端程序,之后就可以直接在同一无线局域网中,通过电脑中安装的浏览器打开特定的IP地址,即可进行文件管理了。     

当心被篡改 Wi-Fi也要做“体检”

病毒名称:Wi-Fi网络篡改传播途径:某厂商多款路由器存在安全漏洞,黑客能够通过漏洞控制路由器,监控用户的电脑、手机、Pad等所有设备的上网行为,伺机窃取网银和网购账号密码,甚至挟持用户访问钓鱼网站行为分析:很多家庭现在都安装有无线路由器,但是大多数用户没有修改路由器默认密码的意识;采用低等级加密(WEP),Wi-Fi密码容易被破解蹭网;使用默认的路由器管理IP地址;路由器固件存在漏洞,用户不知如何修     

无线路由器ARP攻击故障排除的几个方法

距离是否过远或中间有大型障碍物阻隔。这时请重新放置路由器,使无线路由器与接收电脑不要间隔太多障碍物,并使接收电脑在无线路由器的信号发射范围之内即可。设置不当无法连接＂设置＂可以分为计算机设置和路由器设置两个方面。计算机的设置相对简单,点击进入＂网上邻居＂属性,开启＂无线网络连接＂,然后设置＂IP地址＂＂子网掩码＂及＂网关”,只要使计算机的IP地址与无线路由器的IP地址在同一网段即可。“网关”的设置可以参见网卡说明,一般情况下与路由器IP地址相同。     

化解无线网络的IP冲突

在一些无线网络中，由于客户机数目较多，为方便对这些机器进行管理，很多管理员会使用无线路由器提供的DHCP服务，为客户机提供TCP／IP参数配置，如IP地址、网关地址和DNS服务器等。但如果你的无线网络中，有些电脑必须手工指定TCP／IP参数配置，这时DHCP服务器提供的动态IP地址和手工指定的静态IP地址共存，如果你没有合理配置无线路由器中DHCP服务器的参数，就会很容易造成IP地址冲突。     

一分钱也要省 移动Wi-Fi通

如今国内无线Wi-Fi热点越来越多,但很多人往往没有意识到自己身边存在的无线热点,依旧使用手机数据网络上网,造成很多不必要的流量花销。免费Wi-Fi轻松管理移动Wi-Fi通(下载地址:http://955.cc/jP7d)是中国移动为广大移动手机用户打造的一款实用的无线管理应用软件,支持常见的所有主流手机操作系统。该软件主要针对移动网络的无线Wi-Fi热点,用户需要移动的账号和密码才可以登录使用,对使用电信和联通号码的用户只能说声抱歉了。     

解决NDS的Wi-Fi兼容性问题

不少人都喜欢用NDS（任天堂公司的DS掌上游戏机）联机玩游戏，但可能会遇到NDS无法接入Wi-Fi网络的情况，即NDS能够发现无线路由器，却无法获取IP地址。任天堂官方公布了一份无线路由器的兼容性列表（网络地址http：／／wifi．nintendo．co.jp／information/router／index．html#top），使用列表中的无线路由器一般不会出现问题。那列表之外的无线路由器呢？其实，很多没有在列表中的无线路由器经过适当的设置也是可以兼容NDS的。     

玩转Mini无线路由器

正无线路由器逐渐成为了商务出差或旅行用户的必备,出差或旅行途中入住酒店,只需要把酒店房间里提供的网线插到设备的以太网口,再把它插到电源插座上,整个房间就实现了Wi-Fi无线覆盖。此时,用户便可以拿出笔记本、Wi-Fi手机、iPad或是其它任何支持Wi-Fi无线上网的设备,在房间任何地方无线上网。同时大多Mini系列无线路由器都支持AP、Router、Bridge等多种应用模式,无线组网灵活方便。下面,笔者就将以TP-LINK Mini系列无线路由器为例,为大家讲解Mini无线路由器设置方法——     

打造多样化Wi-Fi 三星数码打印产品先行

三星旗下的Wi-Fi无线打印产品目前已经全面覆盖黑白激光打印机、黑白多功能一体机和彩色激光打印机、彩色多功能一体机,功能上足以满足不同用户的办公需求。此前,三星的Wi-Fi无线打印产品都是黑色的机身,虽然同样小巧时尚,但总有用户对办公空间的色彩搭     

基于群树结构的IPv6无线传感器网络的组网及路由协议

如何实现WSN与IP网络的结合是当前的一个热点研究问题。针对IPv6与无线传感器网络相结合的标准全IP方式,研究了无线传感器网络的网络组织、路由以及地址分配方案,提出了基于群树结构的组网、路由以及地址分配方案,实现了IPv6与无线传感器网络的紧密结合,并用NS-2对其性能进行了仿真分析。     

Intelligent multi-sensor control system based on innovative technology integration via ZigBee and Wi-Fi networks

Data transmission network integration is one of the most difficult problems to solve in wireless sensor network systems. ZigBee and Wi-Fi belong to different network protocols. If a network system must use both ZigBee and Wi-Fi at the same time to transmit data a considerable challenge is presented. This paper introduces a novel hardware method that integrates ZigBee and Wi-Fi. The proposed method is based on the Arduino wearable module ZigBee and Ethernet concept. This study builds an intelligent home appliance control system using the ZigBee network. This intelligent control system uses an integrated ZigBee and Wi-Fi network architecture in the house. Our study sends the ZigBee sensor messages to a cloud database through the TCP/IP protocol network containing the physical network and wireless network device lines. Control management access is achieved using smart phones. The proposed method is very simple and easy to implement using Arduino circuits. The effectiveness of the proposed method is verified by the simulation and experimental results. The hardware components include the Arduino controller, XBee Series 2 wireless communication module and end device sensors. The Android and Java programming languages are used to write the smart phone and Server recognition programs.     

一种基于RSSI的无线网络接口低功耗方法

通过对Wi-Fi无线网络接口卡(Wi-Fi NIC,Wi-Fi network interface card)功耗特性的研究与分析发现,Wi-Fi接口活动功耗与上行/下行传输速率成线性关系.接收信号强度指示器(RSSI,received signalstrength indicator)是影响数据传输率的重要因素.智能移动终端在高信号强度环境下具有更高的数据传输速率、更低的丢包率与错误率,为节省Wi-Fi数据传输功耗并减小数据延时,提出一种基于RSSI的Wi-Fi NIC低功耗管理方法,通过检查RSSI值,选择性发送或推迟发送延时容忍(delay tolerant)的非实时数据,保证数据在高信号强度下传输,使得数据传输总时间缩短的同时获得功耗节省.     

密集区域无线网通信传输的研究

随着我国通信技术的不断发展和完善,无线网络的应用给我们日常生活带来了很多的便利。但对于处在不同环境下的无线网络情况,展现出各异的通信难点。该文通过分析密集区域无线Wi-Fi传输所存在的一些问题,提出几点建设性的方案。     

无线网络安全技术分析

文章首先分析了网线网络面临的安全隐患,基于此围绕网络安全的核心要素:认证、加密、完整性,介绍分析了物理地址(MAC)过滤、服务区标识符(SSID)匹配、有线对等保密(WEP)、端口访问控制技术(IEEE802.1x)、WPA?(Wi-FiProtected Access)、IEEE802.11i等无线网络安全技术的原理,并结合典型应用场合给出了相应的无线网络安全策略方案。     

Wireless MediaNets: application-driven next-generation wireless IP networks

Thanks to the explosive creation of multimedia contents, the pervasive adoption of multimedia coding standards and the ubiquitous access of multimedia services, multimedia networking is everywhere in our daily lives. Unfortunately, the existing best effort IP network infrastructure, originally designed with little real-time QoS requirement, has started to suffer from performance degradation on emerging multimedia networking applications. This inadequacy problem is further deepened by the prevalence of last/first-mile wireless networking, such as Wi-Fi, mobile WiMAX, and many wireless sensors and ad-hoc networks. This can be evidenced by more and more fragmentation of application-driven IP-based networks, such as for power grid distribution, networked security surveillance, intelligent transportation communication, and many other sensor networks. To overcome the QoS challenges, the next generation wireless IP networks have to be architected in a top-down manner, i.e., application-driven layered protocol design. More specifically, based on the application media data, compression schemes are applied, the subsequent Network, MAC- and PHY-layered protocols need to be accordingly or jointly enhanced to reach the optimal performance. This is the fundamental concept behind the design of Wireless MediaNets. In this survey paper, I will address the QoS challenges specifically encountered in video over heterogeneous wireless broadband networks and address several application-driven Wireless MediaNet solutions based on effective cross-layer integration of APP and MAC/PHY layers. More specifically, the congestion control for achieving airtime fairness of video streaming to maximize the link adaptation performance of Wi-Fi, the minimum latency event-driven data exchange for distributed wireless ad-hoc sensor networks, and the opportunistic multicast of scalable video live streaming over mobile WiMAX.     

Wi-Fi无线网络技术在校园网中的应用

随着计Wi-Fi无线网络技术日趋成熟,其取代传统的蓝牙技术、HomeRF技术,在各行各业特别是校园中被广泛的使用。其所具备的移动性、便捷性、高速性及开放性等特征,给我带来了诸多便利,但也正是这些与生俱来的特点,其所具备的安全隐患也备受关注。本文将重点分析Wi-Fi无线技术如何为校园服务、如何规划建设无线校园及对无线网络安全提出些许建议。     

一种基于FPGA的VoWLAN终端研究

在分析现有网络电话终端实现方式的基础上,提出了一种基于现场可编程门阵列（FPGA）且具有无线保真（wi—Fi）功能的无线网络电话终端（VoWLAN终端,基于无线局域网的语音通信终端）的设计方案。主要研究内容包括设计w1-Fi通信模块,利用可编程片上系统（sOPc）技术在FPGA上移植ORl200软核处理器,将嵌入式Linux操作系统移植到ORl200软核处理器上,最后设计出VoIP应用软件。     

基于ARM9的嵌入式无线智能家居网关设计

针对传统智能家居系统中多种无线通信技术之间互联的困扰,设计了一个新的两种无线通信技术直连的智能家居网关。该网关以ARM920T嵌入式处理器S3C2440A为核心,ARM Linux为实时操作系统,采用新兴的Zigbee与Wi-Fi融合的通信技术,以满足家庭远程监控、家庭安防和家电控制的个性化需求。在ARM9处理器上构建嵌入式Web服务器,通过扩展Wi-Fi模块与Zigbee模块实现家庭内部无线网络的建立以及与Internet的连接,并给出了硬件组成结构和软件实现流程。实验结果表明,该网关在丢包率与时间响应方面优于有线网关和Wi-Fi—蓝牙网关,适合在智能家居系统中应用。     

Knowledge-based health service considering user convenience using hybrid Wi-Fi P2P

Recently, with changing paradigms in health, the focus of healthcare is shifting from treatment after contracting disease to prevention and early diagnosis of disease. Accordingly, the healthcare paradigm is changing from diagnosis and treatment to preventive management, emphasizing prevention of chronic diseases, such as obesity. In particular, obesity in children and adolescents has become a global issue. Lifestyle and health management using BT–IT convergence is needed to improve and manage the health of children and adolescents, and convenience and accessibility must be improved. For that, use of a machine-to-machine (M2M) u-health cluster that allows wireless network connection is increasing, along with wireless networks for measuring biometrics. Expanded to communications between people and objects as well as between objects, M2M refers to the next-generation convergence infra-architecture that offers intelligent services through various media. Because various wireless devices form a cluster when building a service platform using M2M, when the number of users with various M2M devices increases, data traffic increases and causes network overload, deteriorating system performance. To solve this problem, services are increasingly being built by combining a conventional network and Wi-Fi technology. However, in an M2M network, there is a limitation due to low transfer speed, because the network processes biometrics and data through different sensor nodes, and wireless communications based on the system is composed of different wireless sensor nodes. Thus, in this paper, we proposed a knowledge-based health service considering user convenience using a hybrid wireless fidelity (Wi-Fi) peer-to-peer (P2P) architecture. For knowledge-based health services in conventional M2M-based smart health services, hybrid Wi-Fi P2P and wireless devices must be linked. Because there are different ways to link hybrid Wi-Fi P2P devices, depending on the network environment, in this study, a dynamic configuration mechanism is applied to Wi-Fi P2P linkage of wireless devices in an M2M environment. The proposed service provides a high-quality health service (whenever patients use the knowledge-based health service) by building a network using a dispersed cross-layer optimization algorithm that optimizes variables of the transmission control protocol/internet protocol stack in order to improve the energy efficiency of the u-health sensor network and system reliability.     

蓝牙与Wi-Fi网络互连方案的研究与设计

本文介绍了蓝牙技术和Wi-Fi技术以及它们的网络特点．分析了共存环境中蓝牙和Wi-Fi的干扰特性，总结了针时共存环境中干扰问题的几种解决方案。提出了蓝牙和Wi-Fi网络互连的协议栈模型．讨论了蓝牙／Wi-Fi网关的设计问题，并给出了一些有价值的结论。