Institute of Electrical & Electronic Engineers
In this paper, the authors propose a new technique to reduce the interference caused by high OFDM side-lobes to the primary users in MIMO-OFDM cognitive systems. The proposed technique does not affect the rate of the system and has very low complexity. They also analyze the performance of the technique for a class of flat fading channels and show that the analytical results agree with simulations. Furthermore, for frequency selective fading channels, numerical results show that the performance is almost the same as that obtained analytically for flat fading channels.