電子通信技術(shù)專用英語munication Technology

電子與通信技術(shù)專業(yè)英語高職高專電子信息類"十三五"規(guī)劃EnglishonElectronicandTelemunicationTechnology零三UnitⅢmunicationTechnologyLesson一五WirelessFidelityUnitⅢNewWordsfidelity [fi'del?ti] n. 逼真,保真度access ['?kses] vt. 使用,接近,獲取hassle ['h?sl] n. 麻煩事plug [pl?ɡ] v. 插上插頭disruption [dis'r?p?n] n. 破裂,毀壞,斷console [k?n's?ul] n. 控制臺,操縱臺NewWordspropagation [,pr?p?'ɡei?n]n. 傳播,傳輸prise [k?m'praiz]vt. 包含,包括,由……組成overlapping [,?uv?'l?pi?]adj. 重疊地router ['ru:t?]n. 路由器PhrasesandExpressionsDSSS(DirectSequenceSpreadSpectrum) 直接序列

擴(kuò)頻OFDM(OrthogonalFrequencyDivisionMultiplexing)正頻分

復(fù)用FHSS(Frequency-HoppingSpreadSpectrum) 跳頻擴(kuò)頻PCI（PeripheralponentInterconnect） 外設(shè)部件互 連標(biāo)準(zhǔn)PhrasesandExpressionsSSID(ServiceSetIDentifier) 服務(wù)集標(biāo)識符USB(UniversalSerialBus) 通用串行總線CardBus 具有總線控制功能地

三二位PC卡PBCC(PacketBroadcastControlChannel) 分組廣播控制信道PhrasesandExpressionsminiPCI 內(nèi)置型無線網(wǎng)卡ExpressCard 擴(kuò)展接口Mbit/s(Megabitspersecond) 兆比特/秒WirelessFidelity,popularlyknownasWi-Fi,developedonIEEE八零二.一一standards,iswidelyusedtechnologyadvancementinwirelessmunication.

Asthenameindicates,WI-FIprovideswirelessaccesstoapplicationsanddataacrossaradiowork.

WI-FIsetsupnumerouswaystobuildupaconnectionbetweenthetransmitterandthereceiversuchasDSSS,FHSS,IR–InfraredandOFDM.

Lesson一五WirelessFidelityChineseTranslationofTexts無線相容認(rèn)證,通常稱為Wi-Fi,它由IEEE八零二.一一標(biāo)準(zhǔn)發(fā)展而來,是在無線通信被廣泛應(yīng)用地先技術(shù)。顧名思義,WI-FI對無線網(wǎng)絡(luò)地應(yīng)用程序與數(shù)據(jù)提供無線接入。WI-FI在發(fā)射端與接收端之間設(shè)置了許多方法來建立連接,如擴(kuò)頻,跳頻,紅外地連接與正頻分復(fù)用。第一五課無線相容認(rèn)證ChineseTranslationofTextsWi-FiprovidesitsuserswiththelibertyofconnectingtotheInterfromanyplacesuchastheirhome,officeorapublicplacewithoutthehasslesofplugginginthewires.

Wi-Fiisquickerthantheconventionalmodemforaccessinginformationoveralargework.Withthehelpofdifferentamplifiers,theuserscaneasilychangetheirlocationwithoutdisruptionintheirworkaccess.

Wi-Fidevicesarepliantwitheachothertograntefficientaccessofinformationtotheuser.

ChineseTranslationofTextsWi-Fi讓用戶可以從任何地方如家,辦公室或公場所等自由連接到互聯(lián)網(wǎng)而不需要插上網(wǎng)線。訪問一個大型網(wǎng)絡(luò)地信息,Wi-Fi比傳統(tǒng)地調(diào)制解調(diào)器快。借助不同放大器地幫助,用戶可以很容易地改變自己地位置而不斷其網(wǎng)絡(luò)接入。Wi-Fi設(shè)備相互兼容以給用戶有效地信息訪問。ChineseTranslationofTextsWi-FilocationwheretheuserscanconnecttothewirelessworkiscalledaWi-Fihotspot.Accessingawirelessworkthroughahotspotinsomecasesiscost-freewhileinsomeitmaycarryadditionalcharges.

ManystandardWi-FidevicessuchasPCI,miniPCI,USB,CardbusandPCcard,ExpressCardmaketheWi-Fiexperienceconvenientandpleasurablefortheusers.

ChineseTranslationofTexts用戶可以連接到無線網(wǎng)絡(luò)地地方被稱為Wi-Fi熱點(diǎn)。在某些情況下,通過熱點(diǎn)訪問無線網(wǎng)絡(luò)是免費(fèi)地,而在另一些地方可能需要額外地費(fèi)用。許多標(biāo)準(zhǔn)地Wi-Fi設(shè)備,如PCI,miniPCI,USB,Cardbus,以及PC卡,ExpressCard使得用戶地Wi-Fi體驗(yàn)方便而愉快。ChineseTranslationofTextsWi-Fiusesradioworkstotransmitdatabetweenitsnodes.

Suchworksaremadeupofcellsthatprovidecoverageacrossthework.

Themorethenumberofcells,thegreaterandstrongeristhecoverageontheradiowork.

ThemostpopularWi-Fitechnologysuchas八零二.一一boperatesontherangeof二.四零GHzupto二.四八三五GHzband.

ChineseTranslationofTextsWi-Fi使用無線網(wǎng)絡(luò)在節(jié)點(diǎn)之間傳輸數(shù)據(jù)。這種網(wǎng)絡(luò)是由覆蓋到整個網(wǎng)絡(luò)范圍地蜂窩組成。蜂窩地數(shù)量越多,無線網(wǎng)絡(luò)地覆蓋范圍越大,越強(qiáng)。最流行地Wi-Fi技術(shù),例如八零二.一一b,工作在二.四零GHz到二.四八三五GHz頻段。ChineseTranslationofTextsThisprovidesaprehensiveplatformforoperatingBluetoothstrategy,cellularphones,andotherscientificequipments.

While八零二.一一atechnologyhastherangeof五.七二五GHzto五.八五零GHzandprovidesupto五四Mbpsinspeed.

八零二.一一gtechnologyisevenbetterasitcoversthreenon-overlappingchannels

andallowsPBCC.ChineseTranslationofTexts這為藍(lán)牙策略,手機(jī)與其它科學(xué)設(shè)備地工作提供了一個全面地臺。雖然八零二.一一a技術(shù)有著五.七二五GHz到五.八五零GHz地范圍,并可提供高達(dá)五四Mbps（兆比特/秒）地速度,但八零二.一一g技術(shù)甚至更好,它包括三個非重疊信道,并允許分組廣播控制信道。ChineseTranslationofTextsDevicethatcanuseWi-Fi(suchasapersonalputer,videogameconsole,Smartphone,tablet,ordigitalaudioplayer)canconnecttoaworkresourcesuchastheInterviaawirelessworkaccesspoint.Wi-Fiworkshavelimitedrange.ChineseTranslationofTexts可以使用無線網(wǎng)絡(luò)地設(shè)備（如個電腦,游戲機(jī),智能手機(jī),板電腦,或數(shù)字音頻播放器）都可以通過無線網(wǎng)絡(luò)接入點(diǎn)連接到英特網(wǎng)等網(wǎng)絡(luò)資源。Wi-Fi網(wǎng)絡(luò)范圍有限。ChineseTranslationofTextsAtypicalWi-Fihomerouterusing八零二.一一bor八零二.一一gmighthavearangeof四五m(一五零ft)indoorsand九零m(三零零ft)outdoors.Rangealsovaries,asWi-Fiisnoexceptiontothephysicsofradiowavepropagation,withfrequencyband.Wi-Fiinthe二.四GHzfrequencyblockhasbetterrangethanWi-Fiinthe五GHzfrequencyblock,andlessrangethantheoldestWi-Fi(andpre-Wi-Fi)九零零MHzblock.ChineseTranslationofTexts一個使用八零二.一一b或八零二.一一g地典型Wi-Fi家庭路由器可能有四五米（一五零英尺）地室內(nèi)范圍與九零米（三零零英尺）地戶外范圍。由于Wi-Fi毫無例外地是無線電波傳播,其范圍也會隨著頻段變化而變化。二.四GHz頻段地Wi-Fi地傳播范圍比五GHz頻段地更大,但小于早期九零零兆赫頻段地Wi-Fi。ChineseTranslationofTextsHotspotcoveragecanpriseanareaassmallasasingleroomwithwallsthatblockradiowavesoraslargeasmanysquaremiles—thisisachievedbyusingmultipleoverlappingaccesspoints（asshowninFig.一五－一）.ChineseTranslationofTexts熱點(diǎn)覆蓋區(qū)域包括小到一個有阻止無線電波地墻地房間,大到幾方英里——這是通過使用多個重疊地接入點(diǎn)實(shí)現(xiàn)地(如圖一五－一所示)。ChineseTranslationofTextsNotesWirelessFidelity,popularlyknownasWi-Fi,developedonIEEE八零二.一一standards,iswidelyusedtechnologyadvancementinwirelessmunication.無線相容認(rèn)證,通常稱為Wi-Fi,它由IEEE八零二.一一標(biāo)準(zhǔn)發(fā)展而來,是在無線通信被廣泛應(yīng)用地先技術(shù)。IEEE:InstituteOfElectricalandElectronicsEngineers.美電氣與電子工程師協(xié)會。IEEE八零二.一一standards:美電氣與電子工程師協(xié)會標(biāo)準(zhǔn)。一NotesWi-FisetsupnumerouswaystobuildupaconnectionbetweenthetransmitterandthereceiversuchasDSSS,FHSS,IR–InfraredandOFDM.Wi-Fi在發(fā)射端與接收端之間設(shè)置了許多方法來建立連接,如擴(kuò)頻,跳頻,紅外地連接與正頻分復(fù)用。IR-Infrared:IR是紅外線地意思,常用說法IR接口,也就是紅外線接口。二NotesManystandardWi-FidevicessuchasPCI,miniPCI,USB,CardbusandPCcard,ExpressCardmaketheWi-Fiexperienceconvenientandpleasurablefortheusers.許多標(biāo)準(zhǔn)地Wi-Fi設(shè)備,如PCI,miniPCI,USB,Cardbus及PC卡,ExpressCard,使得用戶地Wi-Fi體驗(yàn)方便而愉快。三NotesManystandardWi-FidevicessuchasPCI,miniPCI,USB,CardbusandPCcard,ExpressCardmaketheWi-Fiexperienceconvenientandpleasurablefortheusers.PCI:PeripheralponentInterconnect,一種由英特爾（Intel）公司一九九一年推出地用于定義局部總線地標(biāo)準(zhǔn)。PCcard:PC卡,一種用以給計(jì)算機(jī)及其它通信與電子設(shè)備添加諸如存儲器,大容量存儲器,網(wǎng)絡(luò)及無線通信等擴(kuò)展裝置地技術(shù)。三NotesManystandardWi-FidevicessuchasPCI,miniPCI,USB,CardbusandPCcard,ExpressCardmaketheWi-Fiexperienceconvenientandpleasurablefortheusers.miniPCI:miniPCI插槽也同樣是在PCI地基礎(chǔ)上發(fā)展起來地,miniPCI地定義與PCI基本上一致,只是在外形上行了微縮。ExpressCard:由PCIA聯(lián)盟推出地新規(guī)格,其優(yōu)點(diǎn)是體積更小,傳輸速度更快,更適合移動系統(tǒng)。三NotesManystandardWi-FidevicessuchasPCI,miniPCI,USB,CardbusandPCcard,ExpressCardmaketheWi-Fiexperienceconvenientandpleasurablefortheusers.USB:通用串行總線（UniversalSerialBus）,是一新型界面規(guī)格,支持主系統(tǒng)與不同外設(shè)間地數(shù)據(jù)傳輸。USB允許外設(shè)在開機(jī)狀態(tài)下插拔使用,USB具有易于使用,高帶寬,可接多達(dá)一二七個外設(shè),數(shù)據(jù)傳輸穩(wěn)定,支持即時聲音播放及影像壓縮等特點(diǎn)。目前在內(nèi)市場可以見到地USB設(shè)備主要有掃描儀,數(shù)碼相機(jī),打印機(jī),集線器與外置存儲設(shè)備等。三NotesManystandardWi-FidevicessuchasPCI,miniPCI,USB,CardbusandPCcard,ExpressCardmaketheWi-Fiexperienceconvenientandpleasurablefortheusers.CardBus:PCIA推出地下一代高能三二位總線主控接口。它使現(xiàn)在只在桌面與較大地系統(tǒng)上才擁有地高級功能可以移入CardBus卡,從而可以用在移動環(huán)境下。三NotesWhile八零二.一一atechnologyhastherangeof五.七二五GHzto五.八五零GHzandprovidesupto五四Mbit/sinspeed.八零二.一一gtechnologyisevenbetterasitcoversthreenon-overlappingchannelsandallowsPBCC.雖然八零二.一一a技術(shù)有著五.七二五GHz到五.八五零GHz地范圍,并可提供高達(dá)五四Mbit/s（兆比特/秒）地速度,但八零二.一一g技術(shù)甚至更好,它包括三個非重疊信道,并允許分組廣播控制信道。四NotesWhile八零二.一一atechnologyhastherangeof五.七二五GHzto五.八五零GHzandprovidesupto五四Mbit/sinspeed.八零二.一一gtechnologyisevenbetterasitcoversthreenon-overlappingchannelsandallowsPBCC.八零二.一一atechnology:IEEE于一九九七年公告地?zé)o線區(qū)域網(wǎng)絡(luò)標(biāo)準(zhǔn),適用于有線站臺與無線用戶或無線用戶之間地溝通聯(lián)結(jié)。八零二.一一a是八零二.一一地衍生版,于五.八GHz頻段提供了最高五四Mbit/s地速率規(guī)格,并運(yùn)用正頻分復(fù)用編碼機(jī)制以取代八零二.一一地FHSS或DSSS。八零二.一一g在二.四GHz頻段上提供高于二零Mbit/s地速率規(guī)格。四NotesAtypicalWi-Fihomerouterusing八零二.一一bor八零二.一一gmighthavearangeof四五m(一五零ft)indoorsand九零m(三零零ft)outdoors.一個使用八零二.一一b或八零二.一一g地典型Wi-Fi家庭路由器可能有四五米（一五零英尺）地室內(nèi)范圍與九零米（三零零英尺）地室外范圍。ft:英尺地意思,feet復(fù)數(shù),foot單數(shù),直接用縮寫ft即可。一ft=零.三零四八m（米）五Exercises一.WriteT(True)orF(False)besidethefollowingstatementsaboutthetext.a.Withthehelpofdifferentamplifiers,theuserscaneasilychangetheirlocationwithdisruptionintheirworkaccess.b.Wi-Fiusesradioworkstotransmitdatabetweenitsnodes.c.Wi-Fiworksdon’thavelimitedrange.d.Wi-Fiinthe五GHzfrequencyblockhasbetterrangethanWi-Fiinthe二.四GHzfrequencyblock,andlessrangethantheoldestWi-Fi(andpre-Wi-Fi)九零零MHzblock.Exercises一.WriteT(True)orF(False)besidethefollowingstatementsaboutthetext.a.Withthehelpofdifferentamplifiers,theuserscaneasilychangetheirlocationwithdisruptionintheirworkaccess.b.Wi-Fiusesradioworkstotransmitdatabetweenitsnodes.c.Wi-Fiworksdon’thavelimitedrange.d.Wi-Fiinthe五GHzfrequencyblockhasbetterrangethanWi-Fiinthe二.四GHzfrequencyblock,andlessrangethantheoldestWi-Fi(andpre-Wi-Fi)九零零MHzblock.FT

FFExercises二.Fillinthemissingwordsaccordingtothetext.a.Wi-FiprovidesitsuserswiththelibertyofconnectingtotheInterfrom suchastheirhome,officeorapublicplacewithouttheinthewires.b.canpriseanareaassmallasasingleroomwithwallsthatblockradiowavesoraslargeasmanysquaremiles—thisisachievedby.c.Wi-Filocationwheretheuserscanconnecttothewirelessworkiscalleda.d.Themorenumberofcells,theandisthecoverageontheradiowork.Exercises二.Fillinthemissingwordsaccordingtothetext.a.Wi-FiprovidesitsuserswiththelibertyofconnectingtotheInterfrom anyplacesuchastheirhome,officeorapublicplacewithoutthehasslesofplugginginthewires.b.Hotspotcoveragecanpriseanareaassmallasasingleroomwithwallsthatblockradiowavesoraslargeasmanysquaremiles—thisisachievedbyusingmultipleoverlapping.c.Wi-FilocationwheretheuserscanconnecttothewirelessworkiscalledaWi-Fihotspot.d.Themorenumberofcells,thegre