Raptor Codes Performance Analysis on WI MAX Technology with high speed FFT/IFFT

There are currently a large variety of wireless accessnetworks, including the emerging vehicular ad hocnetworks (VANETs). A large variety of applicationsutilizing these networks will demand features such as realtime,high-availability, and even instantaneous highbandwidthin some cases. Therefore, it is imperative fornetwork service providers to make the best possible use ofthe combined resources of available heterogeneousnetworks (wireless area networks (WLANs), UniversalMobile Telecommunications Systems, VANETs,Worldwide Interoperability for Microwave Access (WIMAX),etc.) for connection support. When connectionsneed to migrate between heterogeneous networks forperformance and high-availability reasons, seamlessvertical handoff (VHO) is a necessary first step. In the nearfuture, vehicular and other mobile applications will beexpected to have seamless VHO between heterogeneousaccess networks. Time-hopping ultra wideband (TH-UWB)and direct-sequence ultra wideband (DS-UWB) systems areamong the standards proposed for UWB communicationsscenarios. A general unified mathematical approach hasbeen proposed for calculating the bit error rate (BER) forboth TH-UWB and DS-UWB systems in the presence ofmultiple-user interference and strong narrow-bandinterference in a multi-path scenario. Unlike many othermathematical models that provide upper or lower boundsfor BER, this model calculates the exact values for BER ingiven scenarios. A partial rake receiver has been chosen asthe receiving terminal. The modified Salem-Valenzuelachannel model has been used in this analysis. The modelcan assess the effect of any given narrow-band interferingsystems.