无线传输的传感系统中控制程序的设计方法

分析了无线传输的传感系统的控制程序，讨论了通讯协议，接口电路及接口软件的设计，指出了其设计的技术要点。     

基于CDMA的无线公话的设计和实现

本文首先论述了无线公话在现代通讯中的作用和意义，对无线公话的结构分类作了介绍；较详细地阐述了分体式CDMA无线公话的功能及设计。对部分电路作了分析，并给出了系统框图和部分原理图；对相关的软件操作作了相应地说明。     

基于J2ME的无线邮件系统的设计和实现

目前的无线邮件服务模式主要以SMS，MMS等简单的邮件信息模拟为主，并没有使用到邮件服务的大多数功能，而且使用的方便性、操作性、功能扩展性等都不能满足应用的需求。本文分析了无线数据服务和邮件服务模式的演变，讨论了系统整体方案的选择，提出了基于J2ME的系统解决方案；详细讨论了系统的设计与实现，制定了HBWMP通讯协议。     

无线数传技术在无线表决系统中的应用

简单介绍无线表决系统的基本功能和对无线通讯的要求，主要讨论无线数据传输和通讯技术在无线表决系统中的应用，阐述了无线数传理论在实际应用中的关键技术，系统主要指标的实现方法，重点解决了便携设备的低功耗问题。     

无线集群通讯系统在集装箱码头的应用

宁波北仑国际集装箱码头有限公司为配合集装箱生产管理系统(NBCTMS)应用了无线集群通讯系统。本文主要介绍了无线集群通讯系统中数据实时传输系统(双向PAGE系统)的设计、开发与应用环境及效果。     

便携式无线数据传输系统

本文讨论了便携式无线数据传输系统,提出了改进型面向字符的通讯协议,讨论了终端的硬件结构和通信软件的设计,是对无线计算机通信网的有益尝试。     

基于LabVIEW的远程无线监控系统

本文以单片机STC12C5A60S2为控制核心,以LabVIEW为操作平台,提出了日照铁运公司机房多机无线监控系统的设计方案。主要介绍了远程无线监控系统整体设计、硬件电路组成、软件编写等,在设计中将GSM通讯模块与检测回路合并,缩小了硬件体积,保证通讯的可靠性。机房远程无线监控系统经过一段时间运行取得满意效果,为日照铁运公司节省了大量的人力、物力,具有重要的现实意义和广泛的应用前景。     

无线局域网与蓝牙技术在香港突围而出

谈及无线局域网与蓝牙，必先为大家介绍无线通讯网路概念性的三种分类。第一类为无线广域网络(WWAN)，包括现在通行的GSM，CDMA，GPRS与第三代行动通讯系统(3G)。第二类为无线局域网络(WLAN)。第三类为无线个人通讯网路(WPAN)，包括IrDA，蓝牙技术(Bluetooth)及快将面世的IEEE802．15。     

基于施工电梯的N：1无线呼叫系统

针地建筑施工电梯的工作需要，采用先进的编／译码器，研制成一种新颖，操作方便，成本低廉的Ｎ：１无线呼叫通讯系统，文章介绍了系统的功能要求及各组成部分的设计原理。接收系统使用４片ＭＣ１４５０２７，可译出６４个楼层的呼梯信号，由于设计一种独特的发射互喷不，有效地解决了多个楼层同时呼梯的冲突问题，本系统可用于建筑施工及其它场合。     

无线遥控定时系统的设计

采用RF系列无线收／发模块，结合单片机控制，设计了一个无线遥控定时系统，构成了基于无线数据传输的定时系统，并对系统设计中的一些关键问题提出了解决方案。实际调试表明：定时系统的功能达到了设计要求，遥控距离达到几十米。     

宽带无线接入（BWA）技术研究

分析了宽带无线接入（BWA）技术的产生背景,提出了BWA的通用参考模型,并对BWA进行了分类,最后阐述了BWA的应用领域。     

无线 ATM

无线ATM(WATM)是ATM技术和移动通信技术的结合。无线ATM将ATM网上的宽带业务延伸至无线移动网,为下一代个人通信提供宽带解决方案。文章简要介绍了无线ATM的系统结构和一些关键技术。     

A new approach to peer-to-peer wireless LANs based on ultra wide band technology

The advent of Ultra Wide Band (UWB) technology offers a unique opportunity to consider a new type of peer-to-peer wireless Local Area Network (LAN) that requires neither access at a peak data rate commensurate with the full bandwidth of the medium nor a conventional medium access protocol. Rather, due to the extraordinarily high bandwidth afforded by UWB, which is typically much greater than the peak bandwidth required by any ad-hoc radio node, one might imagine a network for which pairs of nodes are interconnected by one or more dedicated (non-shared) radio channels created by time, frequency, or code division multiplexing. In this paper, we consider a network containing N ad-hoc nodes and 2N independent radio channels. Starting with (1) an N × N power matrix, where element p _i,j represents the power needed for a successful transmission from node i to node j including the effects of path loss and shadow fading, and (2) a second N × N traffic matrix where element t _i,j represents the exogenous traffic originating from node i and destined for node j, we seek to assign radio channels and multi-hop route the traffic between source-destination pairs such that the resulting connectivity pattern and traffic flow minimize the average transmit energy needed to deliver a packet between an arbitrarily chosen pair of nodes. With no medium access protocol needed, collisions cannot occur and retransmissions become unnecessary. Moreover, the available capacity grows with the number of channels created (or, alternatively, as some common set of channels are re-used on a non-interfering basis via sufficient spatial separation). In this fashion, such a UWB ad-hoc network takes on the characteristics of a multi-hop Wavelength-Division Multiplexed (WDM) network well known from the multihop lightwave network art, although the constraints and dynamics are certainly different. Since the optimum connectivity and flow problem is shown to be NP hard, several heuristics are considered and compared. These heuristics seek, first, to establish a “good” connectivity graph, and then to flow the traffic in an optimum fashion. Our results suggest that application of these techniques may provide a distinct wireless LAN advantage achievable only via UWB radio technology, and several opportunities for future work based on this novel approach to ad-hoc local area radio networks are identified and discussed. Marc Krull received his B.S. degree in electrical engineering from Brown University in 2001 and his M.S. degree in electrical engineering from the University of California, San Diego in 2004. His graduate research focused on the investigation of energy efficient routing protocols for ultrawideband networks. He is currently with Raytheon Companys Intelligence and Information Systems division in Aurora, Colorado, where he is involved in software development for satellite ground systems. Anthony Acampora is a Professor of Electrical and Computer Engineering at the University of California, San Diego, and is involved in numerous research projects addressing various issues at the leading edge of telecommunication networks, including the Internet, ATM, broadband wireless access, network management and dense wavelength division multiplexing. From 1995 through 1999, he was Director of UCSDs Center for Wireless Communications, responsible for an industrially funded research effort which included circuits, signal processing, smart antennas, basic communication theory, wireless telecommunications networks, infrastructure for wireless communications, and software for mobility. Prior to joining the faculty at UCSD in 1995, he was Professor of Electrical Engineering at Columbia University and Director of the Center for Telecommunications Research, a National Science Foundation Engineering Research Center. He joined the faculty at Columbia in 1988 following a 20-year career at AT&T Bell Laboratories, most of which was spent in basic research where his interests included radio and satellite communications, local and metropolitan area networks, packet switching, wireless access systems, and lightwave networks. His most recent position at Bell Labs was Director of the Transmission Technology Laboratory where he was responsible for a wide range of projects, including broadband networks, image communications, and digital signal processing. At Columbia, he was involved in research and education programs concerning broadband networks, wireless access networks, network management, optical networks and multimedia applications. He received his PhD. in Electrical Engineering from the Polytechnic Institute of Brooklyn and is Fellow of the IEEE and a former member of the IEEE Communication Society Board of Governors. Professor Acampora has published over 160 papers, holds 33 patents, and has authored a textbook entitled An Introduction to Broadband Networks: MANs, ATM, B-ISDN, Self Routing Switches, Optical Networks, and Network Control for Voice, Data, Image and HDTV Telecommunications. He sits on numerous telecommunications advisory committees and frequently serves as a consultant to government and industry.     

宽带无线接入及本地多点分布系统(LMDS)的分析

宽带无线接入解决了通信网发展的制约瓶颈问题,本地多点分布系统（LMDS）是一种新兴的固定宽带无线接入系统。本文介绍了固定宽带无线接入标准IEEE802.16,并分析了按802.16.1标准设置的LMDS。     

一种无线数据传输方案及实现

本文介绍了一种数据信号的无线传输方案,给出了该方案的硬件设计电路框图和软件的主程序流程图.该方案由单片机控制通过无线调制解调芯片与常规UHF、VHF调频电台相连通信,同时与具有标准RS-232接口的计算机数据设备相连,从而实现数据信号的无线传输,由此方案可进一步可组成计算机分组无线网.     

ERNI高速产品和本地生产服务中国用户

正云计算(Cloud Computing)是近年十分流行的概念。电脑集群实现的强大计算能力让各种联网设备都能随时随地连接到"云"端资源,甚至一台手机也可以获得     

WLAN中TCP性能改进的跨层方案仿真

随着无线网络的迅速发展,如何改进TCP在无线网络中的传输性能这一课题,已经成为国内外研究的热点.文章分析了现有的几种典型的TCP改进方案,并在此基础上介绍一种新的跨层方案.通过在传输层和链路层之间引入ARQ Snoop代理,在链路层检测并重传ARQ分组的同时,协调WLAN MAC子层的ARQ机制与TCP的ARQ策略.     

无线本地环路的研究与应用

无线本地环路（ＷＬＬ）技术发展迅猛。本文在介绍ＷＬＬ系统结构的基础上，着重对其技术类型和业务应用进行了探讨，并就我国发展ＷＬＬ技术的有关问题提出了建议。     

GSM无线公话产品中的干扰研究

GSM90 0 /1 80 0固定无线公用电话桌面型话机在开发过程中遇到严重的噪音问题 ,一度成为开发工作的瓶颈。本文就这一噪音问题进行了分析与测试 ,并针对干扰源采取相应的措施 ,在产品开发中付诸应用 ,最终解决了 GSM桌面型无线公话的噪音问题     

图形式档案录入系统的设计与实现

随着信息社会的到来和电子政务在我国的普及,信息系统的建设成为当今一个十分重要的研究课题.如何提高档案管理的效率和档案信息的利用率,是档案管理机构所面临的一个重要任务.在分析图形式档案录入系统功能的基础上,采用浏览器/服务器的设计模式,使用动态网页设计技术,对图形式档案录入系统进行了设计和开发,给出了系统数据库中各数据表的设计结果和图形式档案录入系统部分录入界面及其ASP源代码,达到了图形式档案录入系统设计和开发的目的和要求.