Separate Frequencies ( 1G , 2G & 3G ) | Frequencies distribution of ( 1G , 2G & 3G ) | Frequency Chart ( 1G , 2G & 3G )

Frequency of  1G - 3G
1G wireless network uses almost for voice communication such as for the telecommunication sector specially telephone conversation.This communication system transmitted data through analog technology such as (FDMA)- Frequency Division Multiple Access. In FDMA system each user use a distinct separate communication channel.The first generation (1G) analog system for mobile communications saw two key improvements during the 1970s

Separate Frequencies- 1G   FDMA — Frequency Division Multiple Access : 20  KHz

Second Generation(2G)- The Second Generation(2G) wireless communication standard predominately use digital technology and provided different services like text messaging,send streaming audio etc.2G network communication system transmitting data using technology (TDMA)-Time Division Multiple Access. The Second generation (2G) digital cellular systems were first developed at the end of the 1980s
Separate Frequencies- 2G  TDMA —  Time Division Multiple Access : 200 KHz

Third generation (3G) systems promise faster communications services, including voice, fax and Internet, anytime and anywhere with seamless global roaming.At first! The 3G network was deployed in Japan in 2001. 2.5G networks, such as GPRS (Global Packet Radio Service) are already available in some parts of Europe. 3G available maximum countries in the world.
Separate Frequencies- 3G  CDMA —  Code Division Multiple Access : 200 KHz

Spread spectrum modulation
Originally developed for the military
Resists jamming and many kinds of interference
All users share same (large) block
Coded modulation hidden from those w/o the code spectrum
Soft handoffs possible
One for one frequency reuse
Almost all accepted 3G radio standards are CDMA2000, W-CDMA and TD-SCDMA based on CDMA


Multi-Access Radio Techniques