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Spectrum efficiency, high speed data transmission and security are the major requirements for new generation wireless communications. By integrating OFDM into physical layer of cognitive radio, we can achieve high speed data transmission with high spectrum utilization. In this article, we investigate the impediments for use of OFDM with cognitive radios. We discuss some of the solutions to overcome these problems and identify the need for further exploration taking into account the practicaldoi:10.12785/ijcds/040406 fatcat:qkoln6vp2nhthahgi6jlqitvee