移動(dòng)通信技術(shù)簡(jiǎn)介ppt課件(編輯修改稿)
2025-05-26 03:55 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 st 第 14頁(yè) characteristics ◆ wireless spectrum is very crowded ◆ the transmission power of terminal is limited ◆ Terminals randomly move ◆ the content is easy to be disclosed Jiang Hong Swust 第 15頁(yè) Basic concepts of mobile m. 信 源 發(fā) 射 機(jī) 接 收 機(jī) 信 宿 Basic principle 基礎(chǔ)設(shè)施 infrastructure Jiang Hong Swust 第 16頁(yè) Basic objectives of infrastructure ?Provide access for mobile subscribers ?Provide switching function ?Provide seamless roaming ?Search for mobile users ?Provide other supports, such as billing, handoff, energy control, etc. Jiang Hong Swust 第 17頁(yè) ?technical requirements 移動(dòng)通信的基本概念 1. High spectrum efficiency 2. High quality of service traffic 3. High mobility and portability 4. High flexibility of working 5. Antiinterference 6. Information security Jiang Hong Swust 第 18頁(yè) The key issues of public mobile munication technology Improve quality of service traffic improve spectrum efficiency increase capacity of mobile system provide many types of services provide intelligence to mobile system Jiang Hong Swust 第 19頁(yè) 移動(dòng)通信基本業(yè)務(wù)的應(yīng)用范圍 ?Cellular mobile phone( 蜂窩移動(dòng)電話 ) ?PMRN(Private Mobile Radio Network)(集群通信 警察、消防、出租車(chē)調(diào)度 。 ) ?Wireless paging ( 無(wú)線尋呼 ) ?Cordless phone(無(wú)繩電話 家用 ) ?衛(wèi)星網(wǎng) (satellite works) ?Wireless data works(無(wú)線移動(dòng)數(shù)據(jù)網(wǎng) WxAN： wlan, whan, wpan, wvan、 Ad hoc) Jiang Hong Swust 第 20頁(yè) ?Satellite phone(衛(wèi)星移動(dòng)電話 依星、全球星 ) １ .覆蓋區(qū)域大： high coverage ２ .具有多址連接能力 multi access ３ .頻帶寬、容量大 ４ .通信機(jī)
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