The usage of Internet has been increasing day by day. Wi-Fi
provides wireless access to the internet but range is limited to
certain meters only. So concept of WiMAX is introduced to increase
the range. OFDM (Orthogonal Frequency Division Multiplexing) based
IEEE 802.16 WiMAX has been widely acknowledged as the next
generation wireless standard for providing wideband communications
in rural areas. There are two main types of WiMAX services: mobile
and fixed. Mobile WiMAX enables users access Internet while
traveling whereas fixed WiMAX stations provide wireless Internet
access to clients within a fixed radius. Moreover, WiMAX is capable
of delivering high speed wireless services up to a range of
approximately 50km which is far longer than that of DSL, cable
modem, etc. which has a span of approximately 5.5km. Multicarrier
systems such as WiMAX offer good functionality under heavy
interference. Short interfering signals are countered using long
symbol times, which are made possible by spreading data onto
several subcarriers.
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