A intro to wireless technologies.

1. GSM and CDMA
By Abhijeet Singh

2. GSM:Everyone’s hero

3. 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

4. Procedure
1. 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.

5. GSM Technology

6. The Other Part of the story:
CDMA

7. The experiment

8. 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

9. CDMA Technology

10. For you patience