Opportunistic Spectrum Access in Wide-band Cognitive Radios via Compressive Sensing

With the increasing emergence of new wireless systems and the explosive development of mobile internet applications, the demands on Radio Frequency spectrum have been constantly increasing, and therefore, the related demands for bandwidth, wireless communication technology is facing a potentially scarcity of radio spectrum resources. However, spectrum measurement campaigns have shown that the shortage of radio spectrum is due to inefficient usage and static spectrum allocation policies. Thus, to be able to meet the requirements of bandwidth and spectrum utilization, spectrum underlay access, one of the techniques in Cognitive Radio Networks, has been proposed as a frontier solution to deal with this problem. Nowadays, cognitive radio is one of the most promising paradigms in the arena of wireless radio communications, as it provides the proficient use of radio resources. In the Cognitive Radio networks, the Cognitive Radio (CR) can dynamically regulate its transmission parameters. Proper utilization of the radio spectrum can be performed by the scheme of dynamic spectrum accessing which is undoubtedly necessary. To regulate its Radio Frequency (RF) transmission properties, the CRs are required to sense the radio spectrum periodically for being aware of the licensed users. The enhancement of the spectrum efficiency can opportunistically be