International Journal Of Engineering And Computer Science
Cellular generations differ, in general, in four main aspects: radio access, data rates, bandwidth and switching schemes. The 1G (First Generation) cellular systems, mainly analogue system had a bandwidth ranging from 10 to 30 KHz depending on system type and service. Offered data rates were around 10Kbps after analogue to digital conversion. Radio access scheme was FDMA and switching was all circuit. Suitable for voice-services. The first phase of 2G (Second Generation) GSM systems offered a data rate up to 9.6Kbps and increased in the second phase to reach a peak rate of more than 300Kbps with bandwidth of 200KHz.