CDMA Phones Employs Spread Spectrum Technology

CDMA stands for Code Division Multiple Access, a cellular technology that competes with GSM technology for dominance in the cellular world. Originally, it was developed by the Qualcomm and later on was enhanced by Ericsson. CDMA phones are characterised by high capacity small cell radius, employing spread-spectrum technology and a special coding scheme. In short, we can say that CDMA is a form of spread spectrum signaling.

For CDMA implementations there are many terms used. The original that was defined by the Qualcomm was known as IS-95. Later on, it was revised by the IS-2000 standard (CDMA 2000). All the major communication companies round the globe such as Nokia, Samsung, LG, Motorola Etc., utilize this cellular network of CDMA. The added advantage of CDMA phones is that it can be used as a USB Modem on Mac OS X.

Now a days there are different and exciting variations in CDMA phones. We now have cdma2000 and its variants like 1X EV, 1XEV-DO, and MC 3X. They refer to variants of usage of a 1.25 MHz channel. 3X uses a 5 MHz channel.

More and more added facilities and additions have been introduced such as:

Sprint has launched Mobile Movies on CDMA Phones

Live ABC TV News Programming over US Smart Phones

China Unicom has launched Dual Mode GSM CDMA Phones

Ericsson gets MTN South Africa 3G CDMA contract

QUALCOMM tests Assisted-GPS over CDMA

Lucent to support CDMA at 450 MHz

Nokia to Supply WCDMA 3G Network Expansion to MTC

CDMA 1xECDMA 1xEV-DO deployments grow

CDMA Phones include very accurate time signals (usually referenced to a GPS receiver in the cell base station), so cell phone CDMA-based clocks are an increasingly popular type of radio clock for use in computer networks. The main advantage of using CDMA cell phone signals for reference clock purposes is that they work better inside buildings, thus often eliminating the need to mount a GPS antenna outside a building.

CDMA Phones have the facility of international roaming globally. With this facility, you can expect your phones to work everywhere with all services. Regional, National or International roaming have several elements that are required in order for CDMA roaming to be facilitated, such as CDMA roaming business elements, technical elements, service features, roaming service providers, inter-carrier implementation and roaming carrier maintenance.