What is CDMA?

What is CDMA2000?

- CDMA2000 is a Multi-carrier code-division multiple access version of IMT-2000 standard
- CDMA2000 is a 3G wireless technology.
- World’s first 3G commercial system was launched by SK Telecom of South Korea using CDMA2000 1X
- CDMA 2000 supports mobile data communications at speeds from 144KBPS to 3MBPS
- The versions of CDMA2000 have been developed by Qualcomm and Ericsson
- There were 250,300,000 subscribes world for CDMA by March 2006.

What is CDMA? Explain the technology.

- CDMA stands for Code Division Multiple Access
- CDMA is a wireless technology used in transmission of signal from places with high Security and noise reduction.
- The principle of Spread Spectrum is used to work with CDMA.
- Spread signal is below the noise level noise and has no effect on the signal.
- CDMA does not frequency specific to each user. Instead, every channel uses the full available spectrum.
- Individual conversations are encoded with a pseudo-random digital sequence.
- CDMA always provides better capacity for voice and data communications
- CDMA is a common platform for 3G technologies
- Analog radio transmission technologies like Advanced Mobile Phone System were used in CDMA at the time of its inception
- A unique code is received by all mobile network users and is allowed continuous network access instead of intermittent and timed access.

Explain a.) CDMA One b.) CDMA2000

CDMA One

- CDMA one refers original ITU IS-95 CDMA wireless interface protocol. It is considered as a 2G mobile wireless technology
- The version IS-95A protocol employs a 1.25 Mhz carrier and data speeds up to 14.4 Kbps
- The version IS-95B support data speeds up to 115 kbps by employing 800 MHz / 1.9 GHz.

CDMA2000

- Also known as IMT Multi-Carrier, a family of 3G mobile technology standards.
- Used for sending voice, data and signaling between cell sites and mobile pones
- The standards such as CDMA2000 1X, CDMA2000 EV-DO Rev. 0, are approved radio interfaces for ITU IMT-2000
- CDMA 2000 is backward compatible with its previous 2G iteration IS-95