The Cognitive Radio and the Cognitive Radio Networks have recently become one of the
most intensively studied paradigms in wireless communications. The main distinctive …

Conventional energy detection (ED) spectrum sensing method requires the knowledge of
noise power and consequently suffers from noise uncertainty. In this letter we propose a …

Most previous spectrum sensing techniques use omni-directional antennas. Unlike omni-
directional antennas, the use of directional antennas for spectrum sensing is a promising …

We consider an opportunistic cognitive radio (CR) system in which secondary transmitter
(SU tx) is equipped with a reconfigurable antenna (RA). Utilizing the beam steering …

We consider an opportunistic cognitive radio (CR) system consisting of a primary user (PU),
secondary transmitter (SUtx), and secondary receiver (SUrx), where SUtx is equipped with …

The adaptive beamforming algorithm-minimum variance distortionless response (MVDR)
has been studied based on the electronically steerable parasitic array radiator (ESPAR) …

In this paper, we consider a cognitive radio (CR) system consisting of a primary user (PU)
and a pair of secondary user transmitter (SUtx) and secondary user receiver (SUrx). The …

Spectrum sensing (SS) is one of the principal challenges on which the mobile
communication is based on. Identifying the available frequency bands, also called white …

The spatial spectrum indicates the energy distribution in all directions. If we can get the
spatial spectrum, then the spectrum holes in space are known. In spatial spectrum sensing …

The radio spectrum is a scarce and extremely valuable resource that demands careful real-
time monitoring and dynamic resource allocation. Dynamic spectrum access (DSA) is a new …