通信和网络的IEEE标准(中文4600字,英文2400字)
摘要
对IEEE的802.11标准的出台，使大众市场，在家里，办公室有很大的影响，以及公共领域。如今，笔记本电脑，个人电脑，打印机，移动电话，VoIP电话，MP3播放器，蓝光播放器，以及更多的设备包括无线局域网技术。随着低成本的芯片组和支持高数据率，802.11已成为一个普遍的解决方案，为不断增加的应用空间。由于其较高的市场渗透的直接后果，对一些基本的802.11标准的修订已经制定或正在开发中。他们解决技术问题或添加功能预计将在未来的应用要求。在这篇文章中，我们概述新兴802.11标准和处理技术方面的扩展。文章强调其完成和正在开发的修正案
引言
在IEEE标准项目802目标的物理层（PHY）和介质访问控制（MAC）层中。当无线区域网络（WLAN）当初的构思，似乎便只是另一种可用的物理层标准之一。第一候选人认为是IEEE的标准最突出的802.3（以太网）。不过，它很快变得明显，该电台中有很大的表现良好的线不同。由于巨大的衰减，甚至在短距离，碰撞不能被检测出来。因此，802.3的载波感测多重存取碰撞检测（CSMA / CD）不能适用。
IEEE standards for communications and networks
ABSTRACT
The introduction of IEEE’s 802.11 standards has enabled a mass market, with a huge impact in the home, office, and public areas. Today, laptops, PCs, printers, cellular phones, VoIP phones, MP3 players, Blu-Ray players, and many more devices incorporate wireless LAN technology. With low-cost chipsets and support for high data rates, 802.11 has become a universal solution for an ever increasing application space. As a direct consequence of its high market penetration, several amendments to the basic 802.11 standard have been developed or are under development. They fix technology issues or add functionality expected to be required by future applications. In this article we overview the emerging 802.11 standard and address the technical context of its extensions. The article highlights its finalized amendments and those under development.
INTRODUCTION
Standards in the IEEE project 802 target the physical layer (PHY) and medium access control (MAC) layer. When wireless local area network (WLAN) was first conceived, it seemed that it would be just another PHY of one of the available standards. The first candidate considered for this was IEEE’s most prominent standard 802.3 (Ethernet). However, it soon became obvious that the radio medium is very different from the well-behaved wire. Due to tremendous attenuation even over short distances, collisions cannot be detected. Hence, 802.3’s carrier sense multiple access with collision detection (CSMA/CD) could not be applied. |
