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

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CDMA

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Cdma

CDMA

  • Motohiro Ichinose


Cdma

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

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

CDMA(code division multiple access)


Advantage of using cdma

Advantage of using CDMA

  • Noise reduction

  • Secrecy


Spread singnal

Spread singnal


How to spread

How to spread


Transmit receive and noise reduction

Transmit, receive and noise reduction


Imt 2000 begins last year

IMT-2000 begins last year

  • Celluer phone 9.6kbps

  • Foma (w-cdma) 384kbps

  • 2Mbps


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