CDMA Mobiles

If this mobile phone is not using GSM, it should be using CDMA. Perhaps mobile phone users know that both are cellular phone systems that make use of digital technology to enhance connectivity. But what exactly is CDMA? Who uses it? How does CDMA differ from GSM?

What is CDMA?

CDMA stands for Code Division Multiple Access. It makes use of a unique code system and certain spread spectrum methods so that not just one but many mobile phone users can be compounded or be present in just one physical communication medium or channel. CDMA first began as a communication system devised by England to prevent their German foes from somewhat hacking and blocking their radio transmissions.

Who or What Functions Makes/Make Use Of CDMA?

CDMA has many uses, specifically in navigation and yes, in communication. Do you know about OmniTRACS? How about the Global Positioning System or GPS. These systems make use of CDMA technology.

How Was CDMA Brought To The Fore?

The code division multiple access system first saw the light of day way back the second World War. The communications company Qualcomm devised circuitry and chips for CDMA for use by the English troops against Germany. Before, since everything that came to and past the CDMA is classified military information, things here are kept secret. Right when the news about CDMA reached the masses, it was Qualcomm that claimed ownership over CDMA. Qualcomm also was the premier communications company that commercialised CDMA.

What Are The Differences Between GSM and CDMA?

GSM and CDMA have always been likened to each other, sometimes even linked to each other. But are there really any differences? Here are some of them:

  • CDMA does not make use of a SIM card. GSM does.
  • With GSM, it's easier to avail of roaming services. It's harder to do so with CDMA because you must get license from Qualcomm before you can avail of majority of its features.
  • CDMA can take in more mobile phone users for every bandwidth megahertz than GSM. GSM can only service areas of up to 35 kilometers from the cellular site.