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诺基亚手机射频培训资料

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  • 标      签: 诺基亚手机

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Mobile GeneraTIons1st generaTIon systems, analog• NMT, AMPS, TACS2nd generaTIon systems, digital• GSM, IS-136 TDMA, IS-95 CDMA, PDC3rd generaTIon systems, digital wide band• WCDMA standards have been prepared by ETSI (Europe), ARIB (Japan), TIA (USA),...• 3GPP1 is a joint project that combines all proposals into one standard• Harmonized standard includes three modes• Direct sequence mode based on 3GPP (UTRA2/FDD)• Multi carrier mode based on CDMA2000 (USA proposal)• TDD mode based on 3GPP (UTRA/TDD)
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