СͨΪ֪һ
2003-06-24 12:58ͨŲҵ
[վСͨʵIJǼ⡣ڹź͵Ӫ̵ϵ˼ȵ˶Աֵеķ˵ǣеĶ龹ȫ˶Աʹ£˶ԱȻΪǵ˰˵ĵijЩԱʲôʱӪ̵ߵǰأ£̽֡СͨԹǺ塣]
ǡעӡСͨʱڽǶȵIJͬΪ˸ԵĻݽԵģϣPHSPASлͬһ𣿷չϣСͨп3GݽδϣСͨWLANںϿЩǶСͨжϡ
гʷƺһֱСͨչ似һֱҵΪɴˣȻ⣬СͨΪʲô͡Сͨôܱǰһ̬طһǰհƶϡڼϣҵʵһֱΧչۣСͨҲһ֮鶯߮
⡰СͨΪʲôͱĸϣģͻһֱڡPHSPASлΪСͨĴʣ֮ CDMA450 M SCDMA ġ֡ǼѿСͨʵĿ
ʵϣ PHS ( P ersonal Handyphone System ) ǡСͨõļʽйϢҵΪлΧˣUT˹˾ҹͨʵһ߽뼼лϵͳΪV5.2+AN2000+PHS нӿڣνPASϵͳUT˹Ϊ(P AS ) һƣСͨ
PHSԣʵһƶͨţڶͨżPHSGSMD-AMPSDECTͬһչȼAMPSTACSģ⼼Ƚ3GվPHSĿнӿڼһص㡣
֮ԳơСͨΪļΪPHSǰݽޣԹֻPHSлҲ˵ֻPHSվлϡһҪʵһеȳлߴе츲ǶҪһЩȻʹͬGCĹϵͳȡšͨͬij̶ֳؿҵӪΧϢҵҲһֱڹͬʱСͨڼϵġԽλݻΪͨΪѾ
ڴӼϽ CDMA450 M ӵиõĸЧڶ˹ԼǿʼãһЩطһȿʼӦøԴPHSʵϣ CDMA450 M ĹģѾڡлķ룬ԽؽɵͬʱƵηĿǣϢҵϵֹһСͨķչ
ȻΪлСͨȻֻӵԹ̶ûȺ䣬Щûһ㶼ƶԺҪߣɴ˵óʵ̶ͬͨȽϣСͨ൱Ƶġֻһķǡԡġ
ݽ
ԣڷСͨݽ(ܱ)ʱҲҪһǣչڵʵ(һPASϵͳ)PHSлǣӼۣPHSܵ
ʵϣĿǰҵһЩСͨ3GɵķǻڵڶǼСͨ(ձҹ̨ʡСͨӪһģʽ)ԵƼлĽ綨ΡһϵⶼԽСͨ(ָPASϵͳ)ɵ3Gġ
ʹڡл룬СͨڲݽġȣЩPHSվĽѾPHSרýһվֻͻ˹ʵƣ500 mw ϵĻվǣСͨͨźŸ˴ĸơ
ΣPHSѾͨʵ˿շֶַͬһƵϵһʱ϶(ŵ)Աͬռ䷽λϵûʹԴõãڲƵκ豸ǰ
⣬PHSͨŹܷҲһơСͨTDDͺʺҵTDDнϸߵƵЧʣṩǶԳҵ(вƽ⣬һصϴС)ĿǰһЩPHSȿṩ·ҵҲṩ齻ҵʴ32KһֱԴﵽ128KδݽУPHSṩ300kϵʡ
ɴ˿ɼӪСͨʱѾѧڡлķΧڣؽСΪûṩŵķҲСܹͨ׳ĸڡ
·
гľ˼ϵġԽλһЩطϢҵСͨĶ壬ǿ棬äĿؽСͨչɹƶͨ磬˵ġķʽ CDMA450 M ʽСͨϢҵѾȷֹݼ˽һЩطȻӹ涨ءЩΪСͨδչ˲ȷء
֮⣬ɴƵµı˾ SCDMA ҲʼСܾͨͦܣͬ TD - SCDMA ֮ͬļĿǰPHSҪźܶࡣͬ CDMA450 M һ SCDMA ʽСͨʵҲģֻõ1800 MHz 1805 MHz ƵߵרŻPHSʽռ3GƵʡ
SCDMA һ̶Ϲ߷գӪ̸һ3G֮ǰ3GңӪǰãпɵĽû3GġȻЩѾȫʵ3GĹãûΪʲôһҪ3GأһλרδκпǸʵһСΧġСͨ3G硱3GȴֻڵΣ SCDMA СͨTD- SCDMA ʵΣʱ˭˭IJأרЦʡɼȷлĸ3G֮ǰǿؽСͨеʮֱҪġ
ʵںʽ£һЩ취żͬΪûṩһѡֽγĺȵ Wi - Fi (W LAN ) ȻҵѾ GPRS / W LAN ˫ģ CDMA / W LAN ˫ģΪʲôͲоһPHS/W LAN ˫ģأңGPRSCDMAԣPHSͬWLANѪԵϵһЩͬ뼼ͬTDD(ʱ˫)ʽҶǶضûṩķǷΧ̶ɼСͨͬ WI - FI ֵǿͲһˡ
ĵַ:http://www.cnonline.org/2003/article/3265.html
ǡעӡСͨʱڽǶȵIJͬΪ˸ԵĻݽԵģϣPHSPASлͬһ𣿷չϣСͨп3GݽδϣСͨWLANںϿЩǶСͨжϡ
гʷƺһֱСͨչ似һֱҵΪɴˣȻ⣬СͨΪʲô͡Сͨôܱǰһ̬طһǰհƶϡڼϣҵʵһֱΧչۣСͨҲһ֮鶯߮
⡰СͨΪʲôͱĸϣģͻһֱڡPHSPASлΪСͨĴʣ֮ CDMA450 M SCDMA ġ֡ǼѿСͨʵĿ
ʵϣ PHS ( P ersonal Handyphone System ) ǡСͨõļʽйϢҵΪлΧˣUT˹˾ҹͨʵһ߽뼼лϵͳΪV5.2+AN2000+PHS нӿڣνPASϵͳUT˹Ϊ(P AS ) һƣСͨ
PHSԣʵһƶͨţڶͨżPHSGSMD-AMPSDECTͬһչȼAMPSTACSģ⼼Ƚ3GվPHSĿнӿڼһص㡣
֮ԳơСͨΪļΪPHSǰݽޣԹֻPHSлҲ˵ֻPHSվлϡһҪʵһеȳлߴе츲ǶҪһЩȻʹͬGCĹϵͳȡšͨͬij̶ֳؿҵӪΧϢҵҲһֱڹͬʱСͨڼϵġԽλݻΪͨΪѾ
ڴӼϽ CDMA450 M ӵиõĸЧڶ˹ԼǿʼãһЩطһȿʼӦøԴPHSʵϣ CDMA450 M ĹģѾڡлķ룬ԽؽɵͬʱƵηĿǣϢҵϵֹһСͨķչ
ȻΪлСͨȻֻӵԹ̶ûȺ䣬Щûһ㶼ƶԺҪߣɴ˵óʵ̶ͬͨȽϣСͨ൱Ƶġֻһķǡԡġ
ݽ
ԣڷСͨݽ(ܱ)ʱҲҪһǣչڵʵ(һPASϵͳ)PHSлǣӼۣPHSܵ
ʵϣĿǰҵһЩСͨ3GɵķǻڵڶǼСͨ(ձҹ̨ʡСͨӪһģʽ)ԵƼлĽ綨ΡһϵⶼԽСͨ(ָPASϵͳ)ɵ3Gġ
ʹڡл룬СͨڲݽġȣЩPHSվĽѾPHSרýһվֻͻ˹ʵƣ500 mw ϵĻվǣСͨͨźŸ˴ĸơ
ΣPHSѾͨʵ˿շֶַͬһƵϵһʱ϶(ŵ)Աͬռ䷽λϵûʹԴõãڲƵκ豸ǰ
⣬PHSͨŹܷҲһơСͨTDDͺʺҵTDDнϸߵƵЧʣṩǶԳҵ(вƽ⣬һصϴС)ĿǰһЩPHSȿṩ·ҵҲṩ齻ҵʴ32KһֱԴﵽ128KδݽУPHSṩ300kϵʡ
ɴ˿ɼӪСͨʱѾѧڡлķΧڣؽСΪûṩŵķҲСܹͨ׳ĸڡ
·
гľ˼ϵġԽλһЩطϢҵСͨĶ壬ǿ棬äĿؽСͨչɹƶͨ磬˵ġķʽ CDMA450 M ʽСͨϢҵѾȷֹݼ˽һЩطȻӹ涨ءЩΪСͨδչ˲ȷء
֮⣬ɴƵµı˾ SCDMA ҲʼСܾͨͦܣͬ TD - SCDMA ֮ͬļĿǰPHSҪźܶࡣͬ CDMA450 M һ SCDMA ʽСͨʵҲģֻõ1800 MHz 1805 MHz ƵߵרŻPHSʽռ3GƵʡ
SCDMA һ̶Ϲ߷գӪ̸һ3G֮ǰ3GңӪǰãпɵĽû3GġȻЩѾȫʵ3GĹãûΪʲôһҪ3GأһλרδκпǸʵһСΧġСͨ3G硱3GȴֻڵΣ SCDMA СͨTD- SCDMA ʵΣʱ˭˭IJأרЦʡɼȷлĸ3G֮ǰǿؽСͨеʮֱҪġ
ʵںʽ£һЩ취żͬΪûṩһѡֽγĺȵ Wi - Fi (W LAN ) ȻҵѾ GPRS / W LAN ˫ģ CDMA / W LAN ˫ģΪʲôͲоһPHS/W LAN ˫ģأңGPRSCDMAԣPHSͬWLANѪԵϵһЩͬ뼼ͬTDD(ʱ˫)ʽҶǶضûṩķǷΧ̶ɼСͨͬ WI - FI ֵǿͲһˡ
ĵַ:http://www.cnonline.org/2003/article/3265.html