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1)what is cdma technology?
2)how can cdma work?
3)history of cdma?

Answer Posted / k.muthuvairavan

1) 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.
2)it works on the basis of spread spectrum technology.
3)The second technology standard to consider is CDMA, which
stands for Code Division Multiplex Access. When the world's
first cellular networks were introduced using analog radio
transmission technologies such as Advanced Mobile Phone
System (AMPS) in the early eighties, it became clear that a
higher level of network capacity required accommodating
more user traffic within a tighter radio spectrum.

To accomplish that, the industry developed a new set of
digital wireless technologies-Time Division Multiple Access
(TDMA) and Global System for Mobile-that used a time-
sharing protocol. In essence, these technologies allocated
milliseconds of time to all users accessing the wireless
network. The move to digital network access, though, made
segmenting network usage by code rather than time feasible.
Under CDMA, all mobile network users received a unique code
that allowed them to access the network continuously rather
than intermittent, timed access.

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