文档介绍：该【年产10万套符合wapi标准的wlan系统级产品产业化项目可行性研究报告 】是由【麒麟才子】上传分享，文档一共【106】页，该文档可以免费在线阅读，需要了解更多关于【年产10万套符合wapi标准的wlan系统级产品产业化项目可行性研究报告 】的内容，可以使用淘豆网的站内搜索功能，选择自己适合的文档，以下文字是截取该文章内的部分文字，如需要获得完整电子版，请下载此文档到您的设备，方便您编辑和打印。SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesTSelectionParbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbagraphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraSelec
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第一章项目的意义和必要性
.国内外现状和技术发展趋势
进入世纪以来,世界信息技术发展步入了一个全新的时期。其特点是,网络技术成为信息技术的中心,通信技术发生了深刻的变化,电路交换向分组交换的转变、窄带接入从铜线接入向移动接入的转变、传送技术从点到点通信向光联网的转变、有线无线接入从窄带向宽带的转变等已成为通信技术的主要发展趋势。随着网络应用加速向IP汇聚,互联网与无线通信技术的融合,人们对网络的认识与要求也随之变高。高速率,高性能和兼容性已成为人们的普遍要求,对随时随地进行通信和信息服务的需求变得迫切。现有的有线网络在某种程度上已不能满足需求,因此,无处不在的网络终端,以个人为主,无线化,智能化的移动通信以及快捷方便的无线接入,无线互联等众多适应当前需求的新概念和新产品应运而生。
无线局域网是计算机网络与无线通信技术相结合的产物。它利用射频(RF)技术,取代旧式的双绞铜线构成局域网络,提供传统有线局域网的所有功能,网络所需的基础设施不需再埋在地下或隐藏在墙里,也能够随需移动或变化。使得无线局域网络能利用简单的存取构架让用户透过它,达到
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“信息随身化、便利走天下”的理想境界。WLAN是世纪年代计算机与无线通信技术相结合的产物,它使用无线信道来接入网络,为通信的移动化,个人化和多媒体应用提供了潜在的手段,并成为宽带接入的有效手段之一。无线网状网采用了直序扩频技术。直序扩频是在发送端直接用具有高码率的扩频编码去扩展信号的频谱,而在接收端用相同的扩频编码进行解扩,使扩频信号还原为原始信号。它的优点是:因信号在很宽的频带上被扩展,则单位带宽上的功率很小,即信号功率谱密度很低。这样,信号将淹没在噪声之中,对方难于发现信号的存在,加之对方不知道扩频编码,就更难提取有用信号。因此,扩频使信号的隐蔽性和抗干扰性增强,从而保障了安全性。由于无线局域网利用无线电波在空中传输数据的特性,其安全性始终是市场关注的焦点问题。目前国际标准ISO/IEC.-中的安全解决方案(WEP),在分钟内就可被攻破,已被广泛证实不安全。安全问题如不能得到有效解决,高速发展建设的无线网络在现在和未来,都将可能遭遇颠覆性的破坏。(无线局域网鉴别与保密基础结构)协议机制来保障无线局域网的安全,WAPI机制的提出和在标准中的体现完全遵循国际标准化工作的流程,这为国内产业提供了具有竞争优势并符合产业特点的技术方案,并对提高我国无线局域网产品竞争力,参与国际竞争,促进和规范中国无线局域网产业发展具有积极的意义。
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