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W-CDMA

 

     

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PHS

MAT

CDMA

GSM

 

     

CDMA System
(Wideband-Code Division Multiple Access)

  • ???? CDMA ???????
    ???? CDMA ????? ????????? Multiple-access ???????????????????????????????? (spread spectrum)  ????????????????????????????? CDMA ????????????????????????????????????????????????????????????? Cellular Mobile Phone ????????????????? narrowband CDMA ???????????????? Wideband CDMA ????????????????????????????????????? 3 (Third Generation),  ???? CDMA ?????????????????????? ???????????????????????????????????????????????????????????????????????????????? ?????????????????
???????????????????????????????? Modulated ????????????( spread over a wide frequency band )??????? MHz ??????????????????????? ???? CDMA ???????????????? ????????????????   ??????????????????????????????? cell ??????????????????????????????????????????????????????????? ( high-quality communications)   ???????????????? switching ??????????????????????????????????????? cell ????????? cell ????
  • ???? W-CDMA ???????????????????
    NTT DoCoMo ???????????????? ???????????????????? W-CDMA ??????? ?????????????????? CDMA ???????????????????????????????????????????????????????????????????? Generation ??? 3 ?????????????????????????????????????? Mobile Multimedia
  • ???? W-CDMA ???????????????????????????????
    1. ?????????????????????????????? ISDN ????????? ?????????????????? RAKE ??? TCP
    2. ????????????? High-speed data ???????????????????? bandwidth
    3. ?????????????? Mobile Multimedia ?????????? High resolution video ??? Internet connection ??? voice/fax ??? data up to 2Mbps ??????????????????????????????? multi-rate ???????????????????????????????????????????????
    4. capacity ???????????????????????? ???????????????????????????? frequency spectrum ??????????
    5. ??? Power ???

 

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