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by QUALCOMM
Code Division Multiple Access (CDMA)
technology, pioneered by QUALCOMM, provides excellent voice capacity and
data capability for mobile and fixed wireless networks. Because of its
advantages, CDMA serves as the foundation for 3G services worldwide.
CDMA works by converting speech into digital information, which is then
transmitted as a radio signal over a wireless network. Using a unique code
to distinguish each different call, CDMA enables many more people to share
the airwaves at the same time — without static, cross-talk or
interference.
Commercially introduced in 1995, CDMA quickly became one of the world's
fastest-growing wireless technologies. In 1999, the International
Telecommunications Union selected CDMA as the basis for 3G wireless
systems. Many leading wireless operators have commercially launched or are
now upgrading to 3G CDMA networks in order to provide more capacity for
voice traffic, along with high-speed data capabilities.
Today, more than 180 million users worldwide rely on CDMA2000, WCDMA (UMTS)
and cdmaOne for clear, reliable voice communications and leading-edge data
services.
Key Attributes of CDMA:
- Direct sequence spread
spectrum
- Universal frequency reuse
- Seamless soft handoff
- Multipath propagation for
diversity
- Variable-rate transmission
- Unique forward and reverse
links
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