About the 3G/4G Devices Market Advanced mobile phone system (AMPS) network technology was used in 1G. AMPS was a voice-only network, operating on the 800 MHz band that was permanently switched off in 1999. AMPS was an old radio technology and its operation was similar to a regular radio transmission such as ultra-high-frequency (UHF) radio, where the 800 MHz band was split into many channels using frequency division multiple access (FDMA). Each channel was 30KHz wide and hence, supported only 395 mobile phone users per cell tower. The tower estimated the signal strength of each user and...more >>
from Infiniti Research Limited Market Research Reports http://ift.tt/1Zr5dy6
