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Spectrum may appear to be quite in abundance, in practical terms it is extremely limited because of availability of technologies,propagational and operational constraints and enormous requirements for variety of applications. Wireless is being used so predominantly,
now a days, that there is hardly any walk of life, which does not use radiocommunication in one form or the other. It includes maritime,aeronautical, broadcasting, transport, oil & electricity sectors,public utility services, health & environment, public telecommunication services, internet, e-commerce, and so on and so forth. To cater for the gigantic demand on the spectrum, the world-over, it is essential that the spectrum be used efficiently,economically, rationally and optimally.
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