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Q.

Can you please tell me the difference between GSM and CDMA services more clearly ?

Tags: cdma, gsm
Asked by rajesh bode, 24 Jul '13 05:02 pm
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Answers (2)

1.

GSM (Global System for Mobile communication) GSM is a digital mobile telephone system that is widely used around the world (especially in Europe). GSM uses a variation of TDMA and is the most widely used of all three digital wireless telephone technologies. GSM digitizes and compresses data, then sends it down a channel with two other streams of user data, each in its own time slot ---- CDMA (Code Division Multiple Access) CDMA, unlike TDMA and GSM, after digitizing data, spreads it out over the entire bandwidth available to it (unlike GSM and TDMA which place the calls side by side in three streams). Multiple calls are then overlapped on top of each other, and each is assigned a unique sequencing code to "unlock" the information only when and where it should be unlocked.
Answered by anil garg, 02 Aug '13 05:22 pm

 
  
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2.

GSM (Global System for Mobile Communications).............. GSM is the branded term referring to a particular use of TDMA (Time-Division Multiple Access) technology. GSM is the dominant technology used around the globe and is available in more than 100 countries. It is the standard for communication for most of Asia and Europe. GSM operates on four separate frequencies: Youll find the 900MHz and 1,800MHz bands in Europe and Asia and the 850MHz and 1,900MHz (sometimes referred to as 1.9GHz) bands in North America and Latin America. GSM allows for eight simultaneous calls on the same radio frequency and uses narrowband TDMA, the technology that enables digital transmissions between a mobile phone and a base station. With TDMA the frequency band is divided into multiple channels which are then stacked together into a single stream, hence the term narrowband. This technology allows several callers to share the same channel at the same time.

2. CDMA (Code Division Multiple Access)....... ...more
Answered by Ataur Rahman, 24 Jul '13 05:03 pm

 
  
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