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诺基亚手机射频培训资料
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2009-05-06
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Mobile Generations
1st generation systems, analog
• NMT, AMPS, TACS
2nd generation systems, digital
• GSM, IS-136 TDMA, IS-95 CDMA, PDC
3rd 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)
1st generation systems, analog
• NMT, AMPS, TACS
2nd generation systems, digital
• GSM, IS-136 TDMA, IS-95 CDMA, PDC
3rd 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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dwenyuan
2011-04-13
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