1)what is cdma technology?
2)how can cdma work?
3)history of cdma?
Answer Posted / sumit revdekar
Short for Code-Division Multiple Access, a digital
cellular technology that uses spread-spectrum techniques.
Unlike competing systems, such as GSM, that use TDMA, CDMA
does not assign a specific frequency to each user. Instead,
every channel uses the full available spectrum. Individual
conversations are encoded with a pseudo-random digital
sequence. CDMA consistently provides better capacity for
voice and data communications than other commercial mobile
technologies, allowing more subscribers to connect at any
given time, and it is the common platform on which 3G
technologies are built.CDMA is a military technology first
used during World War II by 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.
Because Qualcomm created communications chips for CDMA
technology, it was privy to the classified information. Once
the information became public, Qualcomm claimed patents on
the technology and became the first to commercialize it.
How CDMA works
The words "code" and "division" are important parts of how
CDMA works. CDMA uses codes to convert between analog voice
signals and digital signals. CDMA also uses codes to
separate (or divide) voice and control data into data
streams called "channels."
These digital data stream channels should not be confused
with frequency channels.
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