Polarization Spectrum Sensing Scheme for Cognitive Radios

Cognitive radios are proposed for secondary users (SU) recovering spectrum holes unused by primary users (PU) in time and space domain. However, the polarization domain of spectrum, allowing simultaneous frequency usage at overlapped areas, is unexploited adequately. In this paper, a novel polarization spectrum holes sensing scheme is proposed for cognitive radios, which exploits transmit and receive polarizations taking into account the interference constraint of PU and the signal to interference noise ratio (SINR) demands of SU. The scheme enables novel spectral sharing opportunities between PU and SU, thereby improving the spectrum utilization efficiency of the wireless communication networks. The scheme is evaluated based on the principle of virtual polarization adaptation, and it has been concluded that the scheme is feasible.