I. Introduction
WiMax is a wireless broadband technology based on IEEE 802.16 standard; This system is based on the Orthogonal Frequency Division Multiplexing (OFDM) and realized broadband data transmission by using a radio-frequency range of 2–11 GHz and 10–66 GHz. WiMax system is a telecommunications technology which enables wireless transmission of voice and data and provide wireless access[1].