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Performance Evaluation of WiMAX/IEEE 802.16 OFDM Physical Layer - page 13 / 107





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it can be faster to deploy, easier to scale and more lexible, thereby giving it the potential to serve customers not served or not satisfied by their wired broadband alternatives.

IEEE 802.16 standard for BWA and its associated industry consortium, Worldwide Interoperability for Microwave Access (WiMAX) forum promise to offer high data rate over large areas to a large number of users where broadband is unavailable. This is the first industry­wide standard that can be used for fixed wireless access with substantially higher bandwidth than most cellular networks [2]. Wireless broadband systems have been in use for many years, but the development of this standard enables economy of scale that can bring down the cost of equipment, ensure interoperability, and reduce investment risk for operators.

The irst version of the IEEE 802.16 standard operates in the 10–66GHz frequency band and requires line­of­sight (LOS) towers. Later the standard extended its operation through different PHY speci ication to 2­11 GHz frequency band enabling non line of sight (NLOS) connections, which require techniques that efficiently mitigate the impairment of fading and multipath [4]. Taking the advantage of OFDM technique the PHY is able to provide robust broadband service in hostile wireless channel.

The OFDM­based physical layer of the IEEE 802.16 standard has been standardized in close cooperation with the European Telecommunications Standards Institute (ETSI) High PERformance Metropolitan Area Network (HiperMAN) [5]. Thus, the HiperMAN

standard and the OFDM­based physical layer of IEEE 802.16 are nearly identical.

OFDM­based physical layers shall comply should emerge [4]. The WiMAX forum both standards.

with certi

each other and a ied products for





Both system with the

1.2 Objective

The objective of this thesis is to implement and simulate the IEEE 802.16 OFDM physical layer using Matlab in order to have better understanding of the standard and the


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