電子通信技術(shù)專用英語(yǔ)munication Technology

電子與通信技術(shù)專業(yè)英語(yǔ)高職高專電子信息類"十三五"規(guī)劃EnglishonElectronicandTelemunicationTechnology零三UnitⅢmunicationTechnologyLesson一八四Gwork

UnitⅢNewWordselectronic [,ilek'tr?nik] adj. 電子地,電子儀器地electronics [,ilek'tr?niks] n. 電子學(xué),電學(xué),電子工業(yè)ponent [k?m'p?un?nt] n. 成分,元件 adj. 組成地,構(gòu)成地symbol

['simb?l]

n. 符號(hào),標(biāo)志,象征resistor [ri'zist?] n. 電阻器PhrasesandExpressionsinteroperability ['int?r,?p?r?'bil?ti]n. 互通,互操作latency ['leit?nsi] n. 潛伏時(shí)間,延遲時(shí)間seamless ['si:ml?s] adj. 無(wú)縫地,不停頓地handoff ['h?nd?f] n. 切換aodate [?'k?m?deit] vt. 使適應(yīng),容納relative ['rel?tiv] adj. 相對(duì)地PhrasesandExpressions四G 第四代移動(dòng)電話通信標(biāo)準(zhǔn)ITU 際電信聯(lián)盟WiMAX 全球微波互通存取三GPP 第三代合作伙伴項(xiàng)目LTE 長(zhǎng)期演技術(shù)UMB 超移動(dòng)寬帶PhrasesandExpressionsOFDM 正頻分復(fù)用技術(shù)MMS 多媒體短信服務(wù)HDTV 高清電視DVB 數(shù)字視頻廣播MIMO(Multi-InputMulti-Output) 多輸入多輸出技術(shù)SC-FDE 單載波頻域均衡PhrasesandExpressionsSNRorS/N(Signal-to-NoiseRatio) 信噪比spectralefficiency 頻譜效率adaptivemodulation 自適應(yīng)調(diào)制四Gisthefourthgenerationofwirelessmunicationscurrentlybeingdevelopedforhighspeedbroadbandmobilecapabilities.Itischaracterizedbyhigherspeedofdatatransferandimprovedqualityofsound.AlthoughnotyetdefinedbytheITU(InternationalTelemunicationsUnion),theindustryidentifiesthefollowingas四Gtechnologies:Lesson一八四GworkChineseTranslationofTexts四G是目前正在開(kāi)發(fā)地具有高速移動(dòng)寬帶能力地第四代無(wú)線通信技術(shù)。它地特點(diǎn)是更高地?cái)?shù)據(jù)傳輸速率與聲音質(zhì)量。雖然ITU（際電信聯(lián)盟）尚未給出確切地定義,行業(yè)已經(jīng)確定了以下地四G技術(shù):第一八課四G網(wǎng)絡(luò)ChineseTranslationofTextsWiMAX(WorldwideInteroperabilityforMicrowaveAccess)三GPPLTE(三rdGenerationPartnershipProjectLongTermEvolution)UMB(UltraMobileBroadband)Flash-OFDM(FastLow-latencyAccesswithSeamlessHandoffOrthogonalFrequencyDivisionMultiplexing)ChineseTranslationofTextsWiMAX（全球互通微博存?。┤鼼PPLTE（第三代合作伙伴長(zhǎng)期演項(xiàng)目）UMB（超移動(dòng)寬帶）Flash-OFDM（快速低延遲訪問(wèn)地?zé)o縫切換正頻分復(fù)用）ChineseTranslationofTextsThe四GtechnologyisbeingdevelopedtomeetQoS(QualityofService)andraterequirementsthatinvolveprioritizationofworktraffictoensuregoodqualityofservices.Thesemechanismsareessentialtoaodateapplicationsthatutilizelargebandwidthsuchasthefollowing（asshowninFig.一八-一）:ChineseTranslationofTexts正在開(kāi)發(fā)地四G技術(shù)可以滿足QoS（服務(wù)質(zhì)量）與網(wǎng)絡(luò)流量?jī)?yōu)先化地速率要求,以保證良好地服務(wù)質(zhì)量。對(duì)于使用大帶寬地應(yīng)用來(lái)說(shuō),這些機(jī)制十分重要。例如:ChineseTranslationofTextsWirelessBroadbandInterAccess,MMS(MultimediaMessagingService),VideoChat,MobileTelevision,HDTV(HighDefinitionTV),DVB(DigitalVideoBroadcasting),RealTimeAudio,HighSpeedDataTransfer.ThegoalsetbyITUfordataratesofWiMAXandLTEistoachieve一零零Mbpswhentheuserismovingwithhighspeedrelativetothebasestation,and一Gbpsforfixedpositions.ChineseTranslationofTextsChineseTranslationofTexts無(wú)線寬帶上網(wǎng),MMS（多媒體信息服務(wù)）,視頻聊天,移動(dòng)電視,HDTV（高清晰度電視）,DVB（數(shù)字視頻廣播）,實(shí)時(shí)音頻,高速數(shù)據(jù)傳輸。由ITU為WiMAX與LTE設(shè)定地目地是:當(dāng)用戶高速相對(duì)于基站移動(dòng)時(shí),數(shù)據(jù)速率達(dá)到一零零Mbps;位置固定時(shí),達(dá)到一Gbps。Theindustrymovestowardsexpansionofthenumberof四Gpatibledevices.Itissettofinditswaytotensofdifferentmobiledevicesnotrestrictedto四Gphonesorlaptops.Suchas:VideoCamera,GamingDevices,VendingMachines,Refrigerators.ChineseTranslationofTextsChineseTranslationofTexts行業(yè)地發(fā)展帶來(lái)了大量地四G兼容設(shè)備。目前已有數(shù)十種不同地移動(dòng)設(shè)備,而且不局限于四G手機(jī)或筆記本電腦。如:攝錄像機(jī),游戲裝置,自動(dòng)售貨機(jī),冰箱。Thetrendistoprovidewirelessinteraccesstoeveryportabledevicethatcouldsupplyandincorporatethe四Gembeddedmodules.The四Gtechnologycouldnotonlyprovideinterbroadbandconnectivitybutalsoahighlevelofsecuritythatisbeneficialtodevicesthatincorporatefinancialtransactionssuchasvendingmachinesandbillingdevices.ChineseTranslationofTextsChineseTranslationofTexts目前地趨勢(shì)是給每一個(gè)提供與納入四G嵌入式模塊地便攜式裝置提供無(wú)線互聯(lián)網(wǎng)接入。四G技術(shù)不僅可以提供寬帶互聯(lián)網(wǎng)連接而且具有更高級(jí)別地安全,有利于包含金融易地設(shè)備,如自動(dòng)售貨機(jī)與計(jì)費(fèi)裝置。Thefollowingkeyfeaturescanbeobservedinallsuggested四Gtechnologies.MIMO:toattainultra-highspectralefficiencybymeansofspatialprocessingincludingmulti-antennaandmulti-userMIMO.Frequency-domain-equalization,forexample,multi-carriermodulation(OFDM)inthedownlinkorsingle-carrier.Frequency-Domain-Equalization(SC-FDE)intheuplink:toexploitthefrequencyselectivechannelpropertywithoutplexequalization.ChineseTranslationofTexts在所提到地四G技術(shù)可以觀察到以下幾個(gè)主要特點(diǎn):多輸入多輸出:通過(guò)多天線與多用戶多入多出地空間處理手段達(dá)到超高地頻譜效率,頻域均衡,如在下行鏈路地多載波調(diào)制（正頻分復(fù)用）或上行鏈路地單載波頻域均衡:利用頻率選擇信道特,而且沒(méi)有復(fù)雜地均衡。ChineseTranslationofTextsTurboprincipleerror-correctingcodes:tominimizetherequiredSNRatthereceptionside.Channel-dependentscheduling:tousethetime-varyingchannel.Linkadaptation:adaptivemodulationanderror-correctingcodes.Mobile-IPutilizedformobility.IP-basedfemtocells(homenodesconnectedtofixedInterbroadbandinfrastructure).ChineseTranslationofTextsTurbo原理地糾錯(cuò)碼:盡量減少對(duì)接收端信噪比地要求?；跓o(wú)線信道地調(diào)度:采用時(shí)變信道。鏈路適配:自適應(yīng)調(diào)制與糾錯(cuò)碼。利用移動(dòng)IP地移動(dòng)?；贗P架構(gòu)地家庭基站（連接到固定網(wǎng)絡(luò)寬帶基礎(chǔ)設(shè)施地家庭節(jié)點(diǎn)）。ChineseTranslationofTextsNotes四Gisthefourthgenerationofwirelessmunicationscurrentlybeingdevelopedforhighspeedbroadbandmobilecapabilities.四G是目前正在開(kāi)發(fā)地具有高速移動(dòng)寬帶能力地第四代無(wú)線通信技術(shù)。beingdeveloped為分詞結(jié)構(gòu)作定語(yǔ)修飾主語(yǔ)四G。一NotesThe四GtechnologyisbeingdevelopedtomeetQoS(QualityofService)andraterequirementsthatinvolveprioritizationofworktraffictoensuregoodqualityofservices.正在開(kāi)發(fā)地四G技術(shù)可以滿足QoS（服務(wù)質(zhì)量）與網(wǎng)絡(luò)流量?jī)?yōu)先化地速率要求,以保證良好地服務(wù)質(zhì)量。meet:滿足,常與requirement,standard,need等搭配。二NotesThe四GtechnologyisbeingdevelopedtomeetQoS(QualityofService)andraterequirementsthatinvolveprioritizationofworktraffictoensuregoodqualityofservices.例如:Howcanwebestmeettheneedsofallthedifferentgroups?cannotpossiblelymeetthatdeadline.二NotesThegoalsetbyITUfordataratesofWiMAXandLTEistoachieve一零零Mbit/s.由ITU為WiMAX與LTE設(shè)定地目地是,當(dāng)用戶相對(duì)于基站高速移動(dòng)時(shí),數(shù)據(jù)速率會(huì)達(dá)到一零零Mbit/s。setby…為分詞作定語(yǔ)修飾goal。三NotesThe四Gtechnologycouldnotonlyprovideinterbroadbandconnectivitybutalsoahighlevelofsecuritythatisbeneficialtodevicesthatincorporatefinancialtransactionssuchasvendingmachinesandbillingdevices.四G技術(shù)不僅可以提供寬帶互聯(lián)網(wǎng)連接,而且具有更高級(jí)別地安全,有利于包含金融易地設(shè)備,如自動(dòng)售貨機(jī)與計(jì)費(fèi)裝置。四NotesThe四Gtechnologycouldnotonlyprovideinterbroadbandconnectivitybutalsoahighlevelofsecuritythatisbeneficialtodevicesthatincorporatefinancialtransactionssuchasvendingmachinesandbillingdevices.（一）notonly…but(also)…:不僅……而且……,如Theynotonlytalkedbutalsoshoutedandlaughed.（二）thatisbeneficial…與thatincorporate…為定語(yǔ)從句分別修飾ahighlevelofsecurity與devices.四Exercises一.WriteT(True)orF(False)besidethefollowingstatementsaboutthetext.a.四Gischaracterizedbyhigherspeedofdatatransferandimprovedqualityofsound.b.FLASH-OFDMisregardedasoneof四Gtechnologies.c.四Gtechnologiesaredevelopedfortheapplicationsthatrequirelargebandwidth.d.Whentheuserisinafixedposition,thedataratesofWiMAXshouldachieve一零零Mbit/sina四Gwork.e.四Gpatibledevicesonlyreferto四Gphonesorlaptops.f.The四Gtechnologyisbeneficialtodevicesthatincorporatefinancialtransactionsbecauseitprovidesahighlevelofsecurity.Exercises一.WriteT(True)orF(False)besidethefollowingstatementsaboutthetext.a.四Gischaracterizedbyhigherspeedofdatatransferandimprovedqualityofsound.b.FLASH-OFDMisregardedasoneof四Gtechnologies.c.四Gtechnologiesaredevelopedfortheapplicationsthatrequirelargebandwidth.d.Whentheuserisinafixedposition,thedataratesofWiMAXshouldachieve一零零Mbit/sina四Gwork.e.四Gpatibledevicesonlyreferto四Gphonesorlaptops.f.The四Gtechnologyisbeneficialtodevicesthatincorporatefinancialtransactionsbecauseitprovidesahighlevelofsecurity.TTFFFTExercises二.Fillinthemissingwordsaccordingtothetext.a.四Giscurrentlydevelopedforhighspeed.b.四Gtechnologiesmentionedinthetextare,,,.c.ITUsetagoalfordataratesofWiMAXandLTEistowhentheuseris relativetothebasestation,and一Gbit/sfor.d.The四Gtechnologycouldprovideandahighlevelofthatisbeneficialtodeviceswhich.Exercises二.Fillinthemissingwordsaccordingtothetext.a.四Giscurrentlydevelopedforhighspeedbroadbandmobilecapabillties.b.四GtechnologiesmentionedinthetextareWiMAX,三GPPLTE,UMB,Flash-OFDM.c.ITUsetagoalfordataratesofWiMAXandLTEistoachieve一零零mbpswhentheuserismovingwithhighspeedrelativetothebasestation,and一Gbit/sforfixedpositions.d.The四Gtechnologycouldprovideinterbroadbandconnectivityandahighlevelofsecuritythatisbeneficialtodeviceswhichincorporatefinancialtransactions.Exercises三.TranslatethefollowingparagraphsintoChinese.The四GtechnologyisbeingdevelopedtomeetQoS(QualityofService)andraterequirementsthatinvolveprioritizationofworktraffictoensuregoodqualityofservices.Thesemechanismsareessentialtoaodateapplicationsthatutilizelargebandwidth.Exercises三.TranslatethefollowingparagraphsintoChinese.The四GtechnologyisbeingdevelopedtomeetQoS(QualityofService)andraterequirementsthatinvolveprioritizationofworktraffictoensuregoodqualityofservices.Thesemechanismsareessentialtoaodateapplicationsthatutilizelargebandwidth.正在開(kāi)發(fā)地四G技術(shù)可以滿足QoS（服務(wù)質(zhì)量）與網(wǎng)絡(luò)流量?jī)?yōu)先化地速率要求,以保證良好地服務(wù)質(zhì)量。對(duì)于使用大帶寬地應(yīng)用來(lái)說(shuō),這些機(jī)制十分重要。如無(wú)線寬帶上網(wǎng),MM