Generalized multi-carrier: An efficient platform for cognitive wireless applications

In this paper the Generalized Multicarrier (GMC) based transmission has been proposed as a candidate for wireless cognitive applications. It has been proved that by relaxing the constraints typical for OFDM transmission (such as fixed time and frequency distance between the transmit pulses) one can gain not only in terms of spectral efficiency but also in terms of lower out-of-band radiation. Moreover, it has been proposed to solve one of the main problems of the GMC signaling, that is the presence of the so-called residual self-interference by means of iterative interference cancellation (IIC) methods. The performance in terms of BER and averaged transmit power of the GMC system has been compared with OFDM one in the presence of the fading channel. In both cases, the pragmatic bit-and-power loading scheme based on the Campello algorithm have been considered and the IIC based receivers have been tested.