TD-SCDMACDMA2000WCDMA˭Ӣۣ
2001-04-08 23:23ͨš
߰:Ϣӿ3Gͨ˳ԽԽDzøɬͨߵ豸ˡѡİ˹ݡͼƵ˼룬ԼĽйͬµIJƸ˵2Mbit/sĴʸֻûΣϲ20005·ݣʵITUںնٿIMT-20002000Ĺƶţᣬ飬ȷߴ似Э顪TD-SCDMAWCDMACDMA2000ֱּ˭վȽŸڼҵ3GսгΪheroأ
3GҪ
ڡֳֻƶֻ£ֶֻ֧ýҵֹʴ2Mbitsʴ384Kbit/sƶʴ144Kbit/sʵָƵʡͳɱߴ似Լȫݵĺ硣ƵΪ1885-2025MHzƵΪ2110-2200MHz230MHzƵԴ
ܱȽ
TD-SCDMA(Time-Division Synchronous Code Division Multiple Access):TD-SCDMAҹϢҵſѧоԺ¹ӹ˾ϿҪص:ֶַͬTDD˫ģʽزΪ1.6MHzTDDһԽ˫ģʽΪڵƶͨУҪԼ400MHzƵԴ3GHzǺʵֵġTDDʹøƵԴҪɶԵƵʣܽʡδŵƵԴ豸ɱԱȽϵͣFDDϵͳ20%--50%رвԳƣͬʵҵ˵TDDʾԽԡҲҲܳΪֱ֮һҪԭ⣬TD-SCDMAصܴϵͳرCDMAϵͳ50ҽ˻վķ书ʣ˸šTD-SCDMAӲơԷdz㣬ͬϵͳļҲʵ֡ȻTD-SCDMAҲһЩȱݣڼijԷּҪǷȱһȡˣϢҵҲɺһڿ˥նûƶٶȷҲһȱݡ
WCDMA(Wideband Code Division Multiple Access ):WCDMAԴŷձּںϡWCDMAֱMCģʽزΪ5MHzݴͿɴﵽÿ2Mbitڣ384Kbpsƶռ䣩MC FDD˫ģʽGSMõļԺͻԡΪһ¼ڼԷ治CDMA2000GSMĹ㷺Ϊ㡣ˣʱҲ̵ܸWCDMAµ첽ģʽATMԪЭ飬ܹһ·ϴУڵ30ߵ300˿ܼĵ·
⣬WCDMAӦߺСϵͳ
CDMA2000(Code Division Multiple Access2000):CDMA2000ͨQualcomm˾öزDSʽزΪ1.25MHzCDMA2000Ϊ:һνṩÿ144Kbit/sݴʣٶȼӿ쵽ÿ2Mbit/sʱǵڶΡʱWCDMAһ֧ƶýCDMAչ3GĿꡣCDMA2000WCDMAԭûбʵ𣬶ԴCDMAIS-95ϵͳCDMA2000˶CDMAIS-95ϵͳȫݣΪԴԵĺô:ԺͿɿԱȽбϣͬʱҲʹCDMA2000ΪӵڶƶͨŹƽѡCDMA2000Ķش䷽ʽWCDMAֱģʽȣƵԴм˷ѣƵIMT-2000涨ƵҲìܡ
̶̬
TD-SCDMA:¹ӹ˾ſѧоԺCATTսˡҲӿйг98껹WCDMA֧ߣCATTһTD-SCDMAӱ֮˺Э飬ΪTD-SCDMAķչžĴٽáȻڵĴƵҲΪ֮˺ܴĹס815գƵšйƶйͨĦΪڱϷٿTD-SCDMA˴ᣬйƶͨҵܵ㷺롣TD-SCDMAIJϳƣĦȸ˾ҲʾԸ֧TD-SCDMA
WCDMA:WCDMA̵֧֣žеĻߡ⣬ŵǣձNECHITACHI£FUJISUҲͶƺͿ֮УŸʮҽϵͳձһƶӪNTT DOCOMOѳ2001꿪ʼWCDMAϵͳ뵼峧ADIֵƳ֧WCDMAоƬ
CDMA2000:CDMA2000֧ûWCDMAô࣬ͨ˾νһ档ȻбһЩ˾֧֣:NORTEL繫˾LUCENT˾⣬ҲϿCDMAӪSprintPCSҲԸ֮
:3GԽԽԣгľҲԽԽ̡Ϥ:йšйƶйͨҹ˾ڶ3G磬й罫йƵTD-SCDMAͬʱڵѶ豸ҲлȡõѶ豸ʸڴڲԶĽһܿѧǴȤɡ
ĵַ:http://www.cnonline.org/2001/article/143.html
3GҪ
ڡֳֻƶֻ£ֶֻ֧ýҵֹʴ2Mbitsʴ384Kbit/sƶʴ144Kbit/sʵָƵʡͳɱߴ似Լȫݵĺ硣ƵΪ1885-2025MHzƵΪ2110-2200MHz230MHzƵԴ
ܱȽ
TD-SCDMA(Time-Division Synchronous Code Division Multiple Access):TD-SCDMAҹϢҵſѧоԺ¹ӹ˾ϿҪص:ֶַͬTDD˫ģʽزΪ1.6MHzTDDһԽ˫ģʽΪڵƶͨУҪԼ400MHzƵԴ3GHzǺʵֵġTDDʹøƵԴҪɶԵƵʣܽʡδŵƵԴ豸ɱԱȽϵͣFDDϵͳ20%--50%رвԳƣͬʵҵ˵TDDʾԽԡҲҲܳΪֱ֮һҪԭ⣬TD-SCDMAصܴϵͳرCDMAϵͳ50ҽ˻վķ书ʣ˸šTD-SCDMAӲơԷdz㣬ͬϵͳļҲʵ֡ȻTD-SCDMAҲһЩȱݣڼijԷּҪǷȱһȡˣϢҵҲɺһڿ˥նûƶٶȷҲһȱݡ
WCDMA(Wideband Code Division Multiple Access ):WCDMAԴŷձּںϡWCDMAֱMCģʽزΪ5MHzݴͿɴﵽÿ2Mbitڣ384Kbpsƶռ䣩MC FDD˫ģʽGSMõļԺͻԡΪһ¼ڼԷ治CDMA2000GSMĹ㷺Ϊ㡣ˣʱҲ̵ܸWCDMAµ첽ģʽATMԪЭ飬ܹһ·ϴУڵ30ߵ300˿ܼĵ·
⣬WCDMAӦߺСϵͳ
CDMA2000(Code Division Multiple Access2000):CDMA2000ͨQualcomm˾öزDSʽزΪ1.25MHzCDMA2000Ϊ:һνṩÿ144Kbit/sݴʣٶȼӿ쵽ÿ2Mbit/sʱǵڶΡʱWCDMAһ֧ƶýCDMAչ3GĿꡣCDMA2000WCDMAԭûбʵ𣬶ԴCDMAIS-95ϵͳCDMA2000˶CDMAIS-95ϵͳȫݣΪԴԵĺô:ԺͿɿԱȽбϣͬʱҲʹCDMA2000ΪӵڶƶͨŹƽѡCDMA2000Ķش䷽ʽWCDMAֱģʽȣƵԴм˷ѣƵIMT-2000涨ƵҲìܡ
̶̬
TD-SCDMA:¹ӹ˾ſѧоԺCATTսˡҲӿйг98껹WCDMA֧ߣCATTһTD-SCDMAӱ֮˺Э飬ΪTD-SCDMAķչžĴٽáȻڵĴƵҲΪ֮˺ܴĹס815գƵšйƶйͨĦΪڱϷٿTD-SCDMA˴ᣬйƶͨҵܵ㷺롣TD-SCDMAIJϳƣĦȸ˾ҲʾԸ֧TD-SCDMA
WCDMA:WCDMA̵֧֣žеĻߡ⣬ŵǣձNECHITACHI£FUJISUҲͶƺͿ֮УŸʮҽϵͳձһƶӪNTT DOCOMOѳ2001꿪ʼWCDMAϵͳ뵼峧ADIֵƳ֧WCDMAоƬ
CDMA2000:CDMA2000֧ûWCDMAô࣬ͨ˾νһ档ȻбһЩ˾֧֣:NORTEL繫˾LUCENT˾⣬ҲϿCDMAӪSprintPCSҲԸ֮
:3GԽԽԣгľҲԽԽ̡Ϥ:йšйƶйͨҹ˾ڶ3G磬й罫йƵTD-SCDMAͬʱڵѶ豸ҲлȡõѶ豸ʸڴڲԶĽһܿѧǴȤɡ
ĵַ:http://www.cnonline.org/2001/article/143.html