This chapter provides a brief introduction on the motivation of this thesis work and its objective as well. At last the structure of the document is provided.
Broadband Wireless Access (BWA) has emerged as a promising solution for last mile access technology to provide high speed internet access in the residential as well as small and medium sized enterprise sectors. At this moment, cable and digital subscriber line (DSL) technologies are providing broadband service in this sectors. But the practical dif iculties in deployment have prevented them from reaching many potential broadband internet customers. Many areas throughout the world currently are not under broadband access facilities. Even many urban and suburban locations may not be served by DSL connectivity as it can only reach about three miles from the central office switch . On the other side many older cable networks do not have return channel which will prevent to offer internet access and many commercial areas are o ten not covered by cable network. But with BWA this dif iculties can be overcome. Because of its wireless nature,