ABSTRACT
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During recent years, wireless communication has emerged as the most widely used
technology in various application domains involving almost all spheres of our daily
activities. Most notable of these applications is, of course, the mobile telephone sys-
tem which has proved extremely useful and popular worldwide. Starting with about
200 million registered mobile users in 1997 [1], the number of users of the mobile
telephone system increased to more than five billion by early 2014.
