⣺TD-SCDMAܴڵش
ߣ
(2008-07-25)
ǩ3g td-scdma 3g 3g it ࣺIT
ժҪйѧԺйԺġѧʱָͶTD-SCDMA(TD)ԪTD֮һʡɱǷ̫ߣƶ߹ܵļְTDоƬֿ˾ĺȻ£TDӪЧҪϢʾDZTDܴڵشijЩα¼IJʵԺƭԡĻTDоſܴڵشĸ﷽
ؼʣTD-SCDMA߹ְܴߣشѧʱ
1
TD-SCDMA(TD)Ϣࣺܶƶи߲㼯ְ41TDźšӪЧTD֮˳ԾĽƼȨѧʱTDҪۣTDͷоƬҵ˾ĵյȵȡЩϢʾTDܴ⣬ӦҵԱĸ߶ӲضԴԱäĿͶTDľʧ
2TDش´ƶ߹ְܼ
ݡһƾձ59ձƶиְ߲ನδСƶܲ½䡢ܲüܹʦ塢սԲ˼ܾɭܼƺְѧְǰƹTDз½ڶദ϶ǴƶҪѡTDĿλùҿƼĴƶܲҲְԭܼܲޱԭܲü浳ίҲ̴ְݱ[1]ȥƶְԱ200ˡ еרָ[1]˾ͼǸɵְԴƶγɳش TDϵͳȥʮ˳нʵڽ41ڱݵȶ֮ʣΪTD֡Ĵƶ֡㼯ߡȻýЩߵҪԭǹ˾չġ·֮ص⡱潫ƶԸΪ֪ԭ
ְԱкܶڴƶ˶꣬мλܲôTDƶ豸зڴϵͳ10ꡣƶΪҺĸ߿Ƽ˾丱ְܲĺӦúܸߣڶ߹ְӦúҵƵְλ۴Ӹ˼չǹʴԣرĿǰһTDõչʱְǺŷġ
ôǴְԭʲôأǴְԭӦʶTDĺԡTDԵı࣬ݱߵõϢTDԵҪڱڿϷDz̫ģΪܵػֺ֧ͱ콢Ŀǣܲšص˺¡йѧԺйԺȻѧίԱġѧʱ426ͷ桰ͷ㡱רһۻԸijЩʾƶ߹ְܼԭ۳ơ˵һЩصĻ˵Լƭˡܶ3GԼΪһˡ ܹTDʼ÷źŵʱվԼƾٹС̡ڰԼĽŰԼƷҪʮתͷΪͶңжҵ·ǰͺ̵ǰĻ˲֪ӦÿӦЦԪͻһʡɱDzе̫ˣ
۵˼ȷܹվTD-SCDMẠֵáҵġѧѡӦ˭ƶĴְ߹ǷҲӦأǵijڡŬʹʶαͶѧѡЩȡعҿƼĸ߹ܸˡ͡һ֮Ȼһָҽ֮·ѧʱӦһ౨µĶӦнϸߵȷԡǰհԺͿŶȡȻǫơTD3GǷý֪ʶݣԴԤ⣬ ȻΪƶĶ߹TDĿ˶꣬ӦTDǷǵļְӦǸ˸һ϶ĴôǾʮܶи߹ְλͿгɹԼTDƹʹöֿɵõĸرأ˿Դְܲȴմ˰ټִĮȻ֮𡣿ѧʱΪһѧȨڼӦþȵ֪ȷжֵġ
33GϢĭIJ
3GΪ2000ǰϢĭIJѱcdma2000 3xcdma2000 1x EV-DVŷTDD-WCDMATDʵһӱЩζƶͨʵѾ3G CDMATDD-WCDMAʵҲTDIJԡ⣬TDߡϽջʵֻʵֵĸ¼ʹԼ۱ȼʹTDD-WCDMAûеĸصļ⣬TDһﵽԤĿ겢мԼ۱ȵĸܺϵͳTDĺʱ˫Ӱǻվշ豸ֻ12ʱڹڲʱЩ豸迪ܡһԣƵ˫ijƶͨϵͳȽ϶ԣһ豸ռ䡣ʱ˫ϵͳֻڲϡƵԳƷƵκСͲƶͨϵͳȻƹTDϽܼŵĻ롣
ԴӼ֤Ŀǰŷڽ֮ƹʹõFDD-WCDMAҲһ2004ףڹһƬɿ3GĹУϢҵָ3Gֲԣ2005110ŲרΪ˵ٿֻ[2]ټ˸šҪƶӪ̡豸̡3GȨʿλᣬʹԭ200535·ݷ3Gյ衣
γϵۺͼǹ˾ŷFDD-WCDMAӦȷҪӪ̣Լ2000ĿĿǰд3G˾ӦעһǮЩŷΪҪȥأӦʶݲǺгȡʤġ
TDһҪԭйΨһʵĹʱⲻ֪ıѼʣµһFDD-WCDMAҲһδӮIJЩTDļʿ֪ЩʵֻDzԸ̫˽ЩʵTDĴ¡Ҳ˽ЩͶʽ־ƶڶTDйصıʵеѡǵTD빲Ĺϵͽݣɲκξε״̬վָ[3]زŹTDȻûȷļƻزţ˴աȻTDIJ֧֣˻ĸʡеҵʿ֪TD֧ѽ߾ȫ˲Ƿǡ⻤̵ij̶ȡ[4]TDȴûǮƶǮȴԸTDͽⳡûָôйƶѪͶʵЧܲκӪʵTD罨裻û֧֣ѪͶTD豸зû֧֣2000κμTDôܳΪʱ
ԲѵسϡһˣѺܶƭ3GΪԹʵˣ3GǹϢĭIJԣԼԸⵣӦǹˣӦýǣ3GܲźƭTD3G
ΪöTDֲͬ۵˱죬˵ʲô¶ѣֻһ²ѣǵ鲻ѣ˾߹ѡ[5]նʮ궯Һڣ˰¼ĸ↑ΰʦСƽij´ĵй֮ڸĸ↑ŵĽѺǸʱˣ෴ȴ¶ĸ↑ܷ뱳۵ΪͶʽĹҶĿġ֡ȴδйѧԺйԺԺʿƺţƺе㲻ƽҲ˵Ƽһֿ
TDĺʱ˫Ӱǻվշ豸ֻ12ʱڹڲʱЩ豸迪ܡһԣƵ˫ijƶͨϵͳȽ϶ԣһ豸ռ䡣ʱ˫ϵͳֻڲϡƵԳƷƵκСͲƶͨϵͳ
4ʵֵTDļ
TD-SCDMAIJΪ[6]TD-SCDMAϵͳвߣSAʹTDģʽȱɿ˷ȵͣҪڵƶְ֧뾶ССȡSATD-SCDMAϵͳͬʱãͿ˷˵Ƭֵ֧Ϣʽϵ͵⡣SAʵֵվƶ̨ȷλӶʵֽл [7]ҲΪSAΪTD-SCDMAĺļڼûţлƵȷҪá
SAƶͨϵͳеӦǽʮоص㣬ʵӦûкܴ롣һʵdzTD⣬3GлʵӦõȥ5¸һҪо[8]һSAʵTDԤĿ꣬ζTDѡõĺļӦеã෴ָԼ۱ȡ˽ʹ߸е[910]ڶѧڿʻϷعʻ[11]ǡţҪо ĸĽ۽TDķչشӰ죬Ϊ뱾УƼ֤۵ȷԡƼij֪ѧԭӲ14оһλ˸ƪġӲ14Ͽ⣬ϣһЩʵ֤ڱʾͬǵĽۡij֪ѧģɵǺͱƶǴͬIJ濴⣬ƺǶԵġһ3GоԱӦְȥ5ǾͽSAоصļĸ˹ϢҵҿƼϢҵоԺزţδκλش𡣻ԼλƶĴְ߹Ѿǵġ
3¡ż־SAӦһЩ[12]
1.ĿǰҵΪSAѳΪTDòϰǷͬ
2.ĿǰӦSAǷʵ룿ûУIJʲô
ΪЩǺɫģǴ˴гĵ2⣬ΪʲôҪSAûʵ룿ԸĻشǣĿǰӦõSAǶߵijڼδõĽǹܸǿĶǾвΡʱոãMIMOշֶַȹܵĶߵ⣬˴ĺĿǰʹõSA߱ನΣշֶַʱոùܡǸöƷҵһ˵ӦSAĻܣͲܳΪSA߱ιܣʹôࡰSATDϵͳĪ˺
˱ԸôʵԺеΪȣ˱λͬĶǵĻش뱾˵ͬ룬ǡż߷е⣬Ҳµ硰żʿǵĴDZȷģáˣΪSAιܵĶҲʹƶ߹̴ְˡܸSAȸ¼ƭTDΡDZ߶SAҪĴδҵͬеĹעоȣҵؼԱԴشľʺͼʧкգеԭӦ֪ġʷ⣬ԲôDZTDڼִķչ·ܻɸľʧǴдĵҪԭTDSAȷʵؼĻǹϢij裬DzܱԶڸǵģһɹ⼼רָĻΪڼı
5TDĸ﷽
йϢҵšԭŲſѧоԺŵǺLGȨιɵTDоƬͷҵϢƼɷ˾Ȼ[13]ù˾TDоƬһֱһߣҵڶһ20074»ΪΨһTD-HSDPAμӪ֯IJԣȥ10£HSDPAãTDնӭӰսĿǰҵΨһṩ˫HSDPAоƬijҡ
ݡITʱܿ2008428յıTDȱڴ˴βԺб¶šıܶ࣬DzδἰTDпܴڴʹSAĺ⣬ӦǵTDϵͳʴμ۰ĹؼأTDϵͳڼٵɡ
ҲTDһĽһĸ﷽[14,15]ܲвԸTDĴʱDzЩĸ﷽ƶҲоΪҪҪԼSA
6
ǰѾ˵TDܴڵش⣬Ӧܲŵ㹻ӣܹäĿ֧TDߺͿڸǼߵһ֮ʣҪעЩֲͬ۵㡢ʵоΪTDĸﹱߵǵоṩҪʽʵ黷֧֣ʹ֪ʶȨTDܹչ
Դĵ봨ѵͬǣ𣬵DZ뻯ʹΪ˼룬ƶѧչŰʱҲα¼Ϊ˻УŬʵ֡˰ܰԴЧõΪᷢչȥ
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[1].ƶиְ߲ನδ .һƾձ200859 0806.
[2]ϢҵƼ˾2004.12.30մ籨֪ͨϾʵѧԺ3Gоֻ
[3] .TD֮ףTD.˿Ƽ2008.4.21 1153
[4].TD.ITʱܿ2008.4.28 1115
[5] С.TD֮ףҴû˵TDᰲ.Ϸб2008.4.29 734
[6]л.TD-SCDMAƶͨϵͳʵ[M].ӹҵ磬2004.6
[7].TD-SCDMAƶͨϵͳ[M].ʵ磬2003
[8]H Y Fu, M Feng, Q Zhang. Research on the Unusability of the Smart Antenna in the TD-SCDMA Standard. THE IET INTERNATIONAL COMMUNICATION CONFERENCE ON WIRELESS MOBILE & SENSOR NETWORKS PROCEEDINGS. 2007.12.14
[9]. TD-SCDMAӦߵ[J]. ſ챨2007.8P36
[10]. TD-SCDMAߵIJо[J]. ϾʵѧѧVol.27 No.42007.8, P4553
[11].The IET Communication Conference on Wireless, Mobile and Sensor Networks 2007(CCWMSN07) Shanghai, China .http://conferences.theiet.org/ccwmsn07
[12]ż.ᶨƵطչTD-SCDMA.ͨ2008.3.24
[13].TDоƬֹ̿Ӫ ǷԱнˮ.һƾձ2008.4.24
[14].TD-SCDMAĸĽ̽[J].ſ챨2006.8P37
[15].TD-SCDMACDMA/TDMAĸ﷽.ſ챨2007.10P37
߽ܣ
1951У㽭ˡϾʵѧͨϢѧԺڡʿʦΪҹɷѧ߳ꡣ1992Ժ䷢ġоΪƶƶͨȡ
ĵַ:http://www.cnonline.org/2008/article/10831.html