The first generation mobile phone (1G) is the simulative cell phone, which is known as the Big Brother in the films and television programmes since fifties or sixties of last century. Of course, the Big Brother is already an anachronism today.
It was first invented by Dr. Cooper in MOTOROLA Inc. Limited by the battery capacity and simulative modulation technology, huge antenna and the development of integrated circuits, the Big Brother is squared and not very portable at the time. Therefore, many people call this kind of mobile phone as brick or Black Edition, etc.
This mobile phone has many systems, like NMT, AMPS, TACS. However, only frequency division multiplexing way is basically used. The disadvantages of Big Brother are the single voice communication, unstable reception effect, insufficient confidentiality and low utilization of wireless bandwidth. The mobile phone is similar to the simple duplex radio and is locked in a certain frequency.
The second generation mobile phone (2G) is the most common cell phone in the world. It usually adopts PHS, GSM or CDMA systems and standards with stable speech quality and extremely long waiting time. In order to meet the demand of data communication,
the second generation mobile phone gets some intermediate standards support, for example, multimedia messaging service (MMS), GPRS and WAP internet service as well as various Java programs.
3G is the abbreviation for 3rd Generation, which refers to the third generation mobile communication technology. Compare with simulative system of the first generation and GSM, CDMA digital mobile phone of the second generation, the third generation mobile phone, as a new generation mobile communication system, combines wireless communication with internet and multi-media communication.gucci wiki It can deal with images, music, video and offers various informative services of website browser, conference call, e-commerce, etc. In order to provide those services, the wireless network must support different transmission speed like 2 Mbps(megabit per second)indoor, 384 KBPS (bits per second)outdoor and 144 KBPS in the driving environment.
　　
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