Modern Wireless
Communication Systems
At the initial phase, mobile communication was restricted to certain ocial users andthe cellular concept was never even dreamt of being made commercially available.
Moreover, even the growth in the cellular networks was very slow. However, with
the development of newer and better technologies starting from the 1970s and with
the mobile users now connected to the PSTN, there has been a remarkable growth
in the cellular radio. However, the spread of mobile communication was very fast
in the 1990s when the government throughout the world provided radio spectrum
licenses for Personal Communication Service (PCS) in 1.8 - 2 GHz frequency band.
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