Evolution of mobile radio communication

The evolution of mobile radio communication throughout the world is beneficial. This is because it helps to understand the vast influence of cellular radio and personal communication services over the next future decades. It helps to understand the variation in the evolution of wireless systems, services and technologies due to government regulatory agencies and service competitors. The progressive involvement of technology leads to growth and penetration of mobile market due to high cost and drastic changes in the technology. Wireless communication systems have been accepted by the subscribers at the rates comparable to the television and video cassette recorders.
Developments in mobile communications have been carried out slowly and then technical enhancements have been done. The wireless communication features were facilitated to entire public after the introduction of cellular concept by Bell laboratories in 1960’s and 1970’s.The future growth of mobile communication system depends on the allocation of radio spectrum advancement in technologies and regular decisions.
In the year1934, Amplitude Modulation (AM) mobile communication systems were utilized by 194 municipal police radio systems and 58 state police stations. The purpose of AM systems is to provide security for public in US. In the middle of 1930’s nearly 5000 radios were installed in mobiles , the users of which suffered from vehicle ignition noise.
In the year 1935,FM was introduced by Edwin Armstrong in mobile communication system, which was then used as basic modulation technique in the world. Table below illustrates the growth and penetration of US mobile users.

Year	Growth in US mobile users
1940	Several thousand
1948	86,000
1958	6,95,000
1962	1.4 Million
1984	25,000
1990	12 Million
1991	25-40 Million
1993	25 Million
1995	100 Million
2001	630 Million
21 st century	1 Billion