by Qualcomm
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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