Performance of Fading Channels on Asynchronous Ofdm Based Cognitive Radio Networks

This paper deals with the performance study of an asynchronous multicarrier based Cognitive Radio (CR) networks. We investigate the effect of asynchronism on the system's performance through a theoretical analysis and by using different types of fading channel in simulations. Since asynchronous interference could be very harmful on the system's QoS level, our work was principally to develop a new theoretical approach to model the asynchronous interference in CR networks. Furthermore, we are leading a comparison between different fading channel models which are suited to wireless CR networks. This performance evaluation was in term of BER using Matlab when different types of Rayleigh fading channels are used ( Pedestrian A, Vehicular A,....). Simulation results showed that the pedestrian and indoor Hiperlan/2 channel give the best performance for our asynchronous OFDM based CR network.