The earliest mobile phone communication system
Mobile communication system is a technical system used to complete information transmission. It is mainly divided into cellular system, trunking system, ad hoc network system, satellite communication system, rope telephone system and so on. In 1864, Maxwell proved the existence of electromagnetic wave, which opened the prelude of using electromagnetic wave to transmit information. In 1978, scientists successfully developed the world's first cellular mobile phone service communication system in the Bell laboratory in Chicago, USA, which pushed the era of human communication into a new field.
Cellular mobile phone communication system is a kind of communication system that divides the coverage area into small areas similar to cellular, and transmits data and information through fixed base stations set in each cell, so as to realize large capacity and large coverage area information exchange. It uses frequency multiplexing technology, which can ensure that the whole service coverage area of mobile terminal can automatically access to the public telephone network. In 1983, this advanced mobile phone communication system was put into commercial production.
The world's first mobile phone Motorola dynatac800x mobile phone, the earliest public phone booth, the earliest radio communication machine