CDMA is Code Division Multiple Access, a cellular technology that competes with GSM technology for dominance in the cellular world. It was originally developed by Qualcomm and was later extended by Ericsson. CDMA phones are characterized by high capacity small cell radius characterized employing spread spectrum technology and special coding. In short, we can say that CDMA is a form of spread spectrum signal.
For CDMA implementations Many terms are used. The original, which was defined by the Qualcomm was called IS-95. Later the standard was revised, IS-2000 (cdma2000). All major communications companies around the globe, such as Nokia, Samsung, LG, Motorola, etc., use the CDMA cellular network. The advantage of CDMA is that it can be used as a USB Modem on Mac OS X
Now a day there are different and exciting variations in CDMA phones. We have now CDMA2000 1X and its variants such as EV, 1xEV-DO and MC 3X. They refer to variants of the use of a channel of 1.25 MHz. 3X uses a 5 MHz channel.
More and more additional facilities and additions were introduced, such as:
Sprint Mobile Phones Movies started on CDMA
ABC News Live TV programming on U.S. Smart Phones
China Unicom has launched GSM CDMA Dual Mode Phones
Ericsson wins MTN South Africa 3G CDMA contract
QUALCOMM tests Assisted-GPS over CDMA
Lucent to support CDMA on 450 MHz
Nokia WCDMA 3G network expansion Supply MTC
CDMA 1xEV-DO deployments grow 1xECDMA
CDMA phones are very accurate time signals (usually referring to a GPS receiver in the cellular base station), the CDMA mobile phone watches are an increasingly popular way radio clock for use in computer networks. The main advantage of using CDMA cell phone signals for reference clock is that they work better in the buildings, that is often unnecessary, a GPS antenna outside on the mountain of a building.
CDMA phones have an opportunity for international roaming in the world. With this installation, you can expect your phone to work everywhere with all services. Regional, national and international roaming have several elements that are necessary to facilitate roaming for CDMA, such as CDMA Roaming Business Elements, technical elements, characteristics of services, service roaming between enterprise work setting and maintenance of the roaming carrier.
CDMA phones have some important features such as message signal narrow-band signal by broadband penetration, or pseudo-code and each user has his own multiplied or pseudo-code (PN) number.
