gsm & cdma
TRANSCRIPT
GSM and CDMABy Abhijeet Singh
GSM:Everyone’s hero
What is GSM?● Global Service for Mobile Communications● European Telecommunications Standards Institute
(ETSI) in 1991● For 2G cellular networks● Over 90% market share, operating in over 219
countries and territories
● GSM carrier frequencies
○ 900 MHz or 1800 MHz bands○ 850 MHz and 1900 MHz bands
Procedure1. Your phone connects to your
network.
2. The Networking and switching system.
3. The receiver is also connected to the network in the same way.
GSM Technology
The Other Part of the story:CDMA
The experiment
What is CDMA?● Code Division Multiple Access● Developed by Soviet Union in 1935● Numerous signals use a single
transmission channel● Optimizes usage of bandwidth
● Uses compulsory encryption
● For military usage
● Used in satellite communication
CDMA Technology
For you patience