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

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 maltiple accsess)

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

2003-11-15T09:22:16