Mobile phone

Code Division Multiple Access (CDMA) is a digital air interface standard, titling eight to fifteen times the capacity of traditional analog cellular systems.
It engages a commercial adaptation of a military spread-spectrum technology.

Based along spread spectrum theory, it passes on basically the like services and qualities as wireline service.
The elemental difference is that access to local exchange carrier (LEC) is brought home bacon via a wireless phone.

Though CDMA’s application in cellular telephony is comparatively new, it is non a raw technology.
CDMA sustains been exploited in many military applications, so much as: Anti-jamming (because of the spread signal, it is hard to pack or interpose with a signal).

Ranging (measuring the distance of the transmission to lie with when it will be received).
Assure communications (the spread spectrum signal is identical heavy to detect).

CDMA is a spread spectrum technology, which means that it spreads the information contained in a particular signal of interest all over a often greater bandwidth than the original signal.
With CDMA, singular digital codes, sooner than split RF frequencies or channels, are secondhand to distinguish subscribers.

The codes are divided past both wandering station (cellular phone) and base station, and are called pseudo-random code sequences.
Since each user is separated aside a unparalleled code, all users can share the equal frequency band (range of radio spectrum).

This applies many alone advantages to the CDMA technique all over other RF techniques in cellular communication.
CDMA is a digital multiple access technique and this cellular aspect of the protocol is specified aside the Telecommunications Industry Association (TIA) as IS-95.

In CDMA, the BSSAP is shared into the DTAP and BSMAP (which checks to BSSMAP GSM).