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