【正文】 I 畢 業(yè) 設(shè) 計(jì)（論 文） 設(shè)計(jì)（論文）題目 :無線寬帶接入技術(shù)及應(yīng)用 摘要 II 對無線寬帶網(wǎng)的研究有利于對通信行業(yè)技術(shù)進(jìn)行更加全面的了解和認(rèn)識(shí)，在以前寬帶無線接入網(wǎng)技術(shù)被廣泛且基本只應(yīng)用于“最后一公里”的接入。但是隨著更多機(jī)遇的介入，使得無線寬帶接入網(wǎng)利用其傳統(tǒng)的 MMDS 和 LMDS 技術(shù)應(yīng)用于了移動(dòng) ,無線 ,寬帶城域網(wǎng)絡(luò)中。并且許多技術(shù)研究組織對其進(jìn)行完善和修改，不斷推出新的協(xié)議，使其在物理層 ,接入規(guī)范 ,媒體接入控制層 ,安全保密等方面都進(jìn)行了擴(kuò)展和規(guī)范。所以在此論文中對其無線局域網(wǎng)技術(shù) ,WIMAX, 和 接口和新的無線接入技術(shù)進(jìn)行了研究，在研究之中我發(fā)現(xiàn)許多技術(shù)之間的相互彌補(bǔ)或相互制約都會(huì)給無線寬帶技術(shù)帶來實(shí)際性的變化，例如想要高質(zhì)量的通信，無疑對傳輸距離，環(huán)境要求會(huì)造成損失和影響，對其的研究應(yīng)考慮多方面條件，在不同情況之下采取的不同技術(shù)和設(shè)備，所以在此研究之中采取了從結(jié)構(gòu)，規(guī)格，技術(shù)，應(yīng)用原理上進(jìn)行了解。通過對其多方面的研究，越發(fā)的認(rèn)為無線寬帶技術(shù)是以后一種必不可少，更加重要的技術(shù)，越來越深入生活，并會(huì)從中給大家?guī)矸奖?，作為以后長 遠(yuǎn)的發(fā)展，低成本，高效率，易維護(hù)將成為關(guān)鍵，所以對其的分析望大家予以指導(dǎo)和思考。 關(guān)鍵詞 WiMAX 無線寬帶接入網(wǎng) 媒質(zhì)接入控制層 物理層 Abstract The research on wireless broadband munications industry can promote a III more prehensive understanding and learning of the technologies. Previously, wireless access work is only applied to the last one mile access extensively and fundamentally. However, with the intervention of more opportunities, wireless broadband access work is applying its traditional MMDS and LMDS technologies to the mobile, wireless, broadband metropolitan works. With the improvement and modification of number of technical research anizations and new protocols introduced, the physical layer, access specification, the media access control layer, security and other aspects are extended and standardized. So the Wireless LAN technology, WIMAX, , Interface and other new wireless access technologies was mainly studied in the paper. The mutual plements or restraints between these technologies will lead substantial changes to wireless broadband technology. For example, there is no doubt that it will have great loss and impact on transmission distance and environmental requirements if highquality munications are required. The study should be considered many of its conditions. Different techniques and equipments should be taken under different conditions. The structures, formats, technologies and application principles mainly were studied to understand it more prehensively. Through the extensive research, the wireless broadband technology is an essential and important technology in future. The more closely it grows to our daily life, the more conveniences we will get. Considering a longterm development, lowcost, high efficiency and easy maintenance will be the key. Once again all of the analysis and reflection can be taken into consideration and make a difference. Key word WiMAX Broadband Wireless Access Technology MAC IV Physical Layer V 目錄 前言 ................................................................................................................................ 1 第 1 章 寬帶無線接入技術(shù)概述 .................................................................................. 2 基本概念 ........................................................................................................... 2 接入網(wǎng)概念 ............................................................................................. 2 寬帶無線（ BWA） ................................................................................ 2 分類 ................................................................................................................... 2 BWA 傳統(tǒng) ........................................................................................................... 3 傳統(tǒng) BWA 技術(shù)發(fā)展 .......................................................................................... 3 第 2 章 WLAN 技術(shù) ......................................................................................................... 5 無線局域網(wǎng)特點(diǎn) .............................................................................................. 5 無線局域網(wǎng)體系 .............................................................................................. 5 的體系結(jié)構(gòu) ................................................................................ 7 認(rèn)證 ,漫游和計(jì)費(fèi) ................................................................................. 10 無線局域網(wǎng)的關(guān)鍵技術(shù) ................................................................................. 13 物理層的關(guān)鍵技術(shù) ............................................................................... 13 無線局域網(wǎng)的 MAC 層關(guān)鍵技術(shù) ........................................................ 14 無線局域網(wǎng)安全問題 ........................................................................... 14 移動(dòng)性問題 ........................................................................................... 14 無線局域網(wǎng)場景的應(yīng)用 ................................................................................. 16 中國無線局域網(wǎng)發(fā)展現(xiàn)狀 ............................................................................. 16 總體市場狀況 ....................................................................................... 16 無線局域網(wǎng)未來趨勢 ..................................................................................... 16 第 3 章 無線城域網(wǎng)（ WLAN） ........................................................... 18 概述 ................................................................................................................. 18 主要標(biāo)準(zhǔn) ......................................................................................................... 18 ................................................................................................................ 18 關(guān)鍵技術(shù) .......................................................................... 20 第 4 章 空中接口規(guī)范 .................................................................. 22 協(xié)議參考模型 ................................................................... 22 總體技術(shù)要求 ................................................................................................. 22 MAC 層要求 ........................................................................................ 24