Performance Analysis of Wi-Max System Under AWGN Channel and Different Modulating Techniques

Abstract

Wireless communication systems have been in use for quite a long time. Many standards (to name 802.11, Bluetooth) are available based on which these devices communicate, but the present standards fail to provide sufficient data rate, when the user is moving at high speed. In view of this requirement for future mobile wireless communication systems, the present standard, 802.16e (Wi-MAX) has been proposed by Institute of Electrical and Electronic Engineers (IEEE). Wi-MAX provides specifications for both fixed Line of sight (LOS) communication in the range of 10-66GHz (802.16c), and fixed portable, Non-LOS communication in the range of 2-11GHz (802.16a, 802.16d). Also it defines wireless communication for mobiles, moving at speed of 125kmph, in the range of 2-6 GHz (802.16e). 802.16e is well implemented with OFDMA as its physical layer scheme. Fixed Broadband Wireless Access (BWA) is a promising technology which can offer high speed voice, video and data service up to the customer end. Due to the absence of any standard specification, earlier BWA systems were based on proprietary standard. IEEE 802.16 WirelessMAN standard specifies a Medium Access Control (MAC) layer and a set of PHY layers to provide fixed and mobile Broadband Wireless Access (BWA) in broad range of frequencies. The WiMAX forum has adopted IEEE 802.16 OFDM PHY layer for the equipment manufacturer due to its robust performance in multipath environment. The dissertation investigates the simulation performance of IEEE 802.16 OFDM PHY layer. The Stanford University Interim (SUI) channel models are selected for the wireless channel in the simulation. The evaluation was done in simulation developed in MATLAB. Perfect channel estimation is assumed.