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Wireless communications networks to provide telephone service to mobile users have been rapidly developed in the past 15 years. Beginning with the first generation analog systems which provide voice service the authors are now on the verge of the standardization of 3rd generation systems which will have the capability to offer multimedia services. The most fundamental concept in the development of economically viable wireless telecommunication networks is the concept of frequency re-uses which allows the use of a relatively small amount of radio spectrum to serve a large population of mobile telephone users in some population area such as a city.
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