CDMA
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CDMA. Motohiro Ichinose. Code Division Multiple Access (CDMA)

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CDMA

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CDMA

  • Motohiro Ichinose


Code Division Multiple Access (CDMA)

A digital wireless technology that uses a "spread spectrum" technique to scatter a radio signal across a wide range of frequencies. CDMA provides greater total capacity than other technologies, along with outstanding voice quality and fewer dropped calls. CDMA is the technology of choice for new third-generation systems

CDMA


CDAM (history)

  • CDMA is a military technology first used during World War II by the English allies to foil German attempts at jamming transmissions. The allies decided to transmit over several frequencies, instead of one, making it difficult for the Germans to pick up the complete signal.


CDMA(code division multiple access)


Advantage of using CDMA

  • Noise reduction

  • Secrecy


Spread singnal


How to spread


Transmit, receive and noise reduction


IMT-2000 begins last year

  • Celluer phone 9.6kbps

  • Foma (w-cdma) 384kbps

  • 2Mbps


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