IEEE软件工程标准综述

简要介绍了ＩＥＥＥ软件工程标准的发展历史,以及ＩＥＥＥ现行的全部３８项正式软件工程标准和２项试用软件工程标准的内容。     

Wi-Fi as a Commercial Service: New Technology and Policy Implications

While Wi-Fi has enjoyed explosive growth and deployment for use in residential homes, the rollout of commercial Wi-Fi service has been more limited. Part of the holdback on large-scale commercial deployment has been the strategic concern that the commons model to spectrum management lacks the incentives for service providers to invest due to the limited ability to manage interference in the unlicensed band. Today, however, this situation appears to have changed. To explain the new confidence by service providers in commercial Wi-Fi, the activities of the Wi-Fi Alliance and IEEE 802.11 standards body are analyzed to show how these groups essentially replicate many, but not all, of the functions traditionally employed by an effective band manager that is optimizing efficiency on a licensed spectrum block more typically associated with the deployment of commercial services. Consequently, with the Wi-Fi ecosystem functioning as an effective spectrum manager, it is concluded that the service provider investment in Public Wi-Fi networks is rational and the risk posed by saturation or overuse has been reduced to an acceptable level. The strategic implications of this finding on the Wi-Fi platform are the examined. How the requirements from service providers are already significantly influencing the evolution of the Wi-Fi standard is discussed, and an attempt is made to address the risks and liabilities associated with the unlicensed spectrum management model. Thus, service providers increasingly need functionality in Wi-Fi technology to manage interference, and monitor and improve network performance. The current ideas under discussion are elaborated for the next version of Wi-Fi to support both commercial Wi-Fi requirements, which address the interference concerns, but only up to a point, as the unlicensed model intrinsically leaves some risk to participants of spectrum saturation through overuse.     

基于无线局域网的多媒体通信系统应用和实现

无线局域网(WLAN)上的多媒体通信已经成为目前通信领域的一个研究热点,因为它具有巨大的潜在市场需求。文中讨论了目前无线局域网技术的特点,以及无线局域网上进行多点多媒体通信的若干关键技术,在此基础上实现一个组网灵活的基于无线局域网的多点视频会议系统。     

无线网络在高校中的应用浅谈

随着无线局域网技术的不断成熟和普及,无线局域网作为有线网络的补充和延伸,对推动高校信息化资源建设的发展起到了重要作用,同时对学校教师、学生的学习、生活方式产生了积极的影响,本文就无线局域网的相关概念和技术和高校内的应用层面进行探讨。     

基于802.16E的WIMAX系统的子载波分配方式和频率规划

本文介绍了802．16e标准TWIMAX的网络的特点以及其物理层的关键技术。介绍了OFMDA方式TWIMAX网络的子载波分配方式（分散的分配方式：包括FUSC，PUSC；连续的分配方式BAND—AMC）；最后引入TWIMAX网路频率规划的原则和典型组网方式。     

基于DP83640的IEEE1588协议实现方案

IEEE1588精确时钟同步协议能够为网络中的各节点提供高精度的时钟同步,在测量和控制系统中具有广泛的应用前景。本文设计了一种嵌入式环境下两个节点进行同步的IEEE-1588协议实现方案,达到了不低于20ns的同步精度。     

IEEE802.11MAC层性能仿真及分析

介绍了NS2的工作原理及仿真的基本流程,阐述了IEEE802.11 MAC协议和其两种基本访问控制方式,并在一定的拓扑环境下模拟仿真试验,分析和评价网络的性能,最后总结了NS2网络仿真技术的实用价值。     

基于ZigBee的城市战红外人体探测系统

针对城市战战场环境复杂,兵力部署多变的特点,提出了一种基于ZigBee技术的红外人体探测系统方案.系统具有低功耗、易部署、抗干扰等特点,可以通过CC2430无线芯片将报警数据传送给监视主机,为指挥员决策提供依据.     

无线局域网技术

本文着重讨论了无线局域网的技术特点、IEEE802．11标准及其拓扑结构、逻辑结构和配置。     

无线局域网技术探讨

论述了近年来发展迅速的无线局域网技术,并通过实际工程案例,介绍了相关的知识。