trainingtrains Logo

91-9990449935

 0120-4256464

JavaTpoint

What is the full form of CDMA

CDMA: Code Division Multiple Access

Code Division Multiple Access is a channel access method used by several radio communication technologies. It is a digital cellular technology and an example of multiple access. It is generally used for mobile communication.

Multiple access means that several transmitters can send information simultaneously over a single communication channel.

CDMA allows several users to share a band of frequencies without undue interference between the users. It is used as a access method in many mobile phone standards.

CDMA full form

Usage

  • It is used in the Global Positioning System (GPS).
  • It is used by several mobile phone companies (e.g. Qualcomm standard IS-2000 also known as CDMA2000)
  • W-CDMA is used in UTMS 3G mobile phone standard.
  • CDMA has been used in OmniTRACS satellite system for transportation.

Categories of CDMA

  • Synchronous CDMA (orthogonal codes)
  • Asynchronous CDMA (pseudorandom codes)

Difference between CDMA and GSM

The major difference between CDMA and GSM are given below.

Criteria CDMA GSM
Technology CDMA is based on spread-spectrum technology which makes the optimum use of available bandwidth. GSM operates on the wedge spectrum. it uses both time division multiple access (TDMA) and frequency division multiple access (fdma). TDMA provide multi-user access by cutting up the channel into different time slice and fdma provides the multi-user access by separating the used frequency.
Security CDMA is more secure than GSM. GSM is less secure than CDMA.
Global reach CDMA is used in usa and some part of canada and japan. CDMA is used only by 24% of the users worldwide. GSM is used over 80% of the world network in over 210 countries.
GSM is used 76% of the users worldwide.
Data Transfer Rate CDMA has faster data transfer as compared to GSM. GSM has slower data transfer as compared to CDMA.
Radiation exposure CDMA phones emits less radiation than GSM phones. GSM phones emits continuous wave pulses and emits almost 28 times more radiation than CDMA phones.
Next TopicCEO Full Form