Cognitive radio (CR) technology has been proposed to solve the inefficient spectrum
utilization resulted from the traditional fixed spectrum allocation strategy used in wireless …

In this study, a secondary network is underlaid in a conventional downlink orthogonal
frequency division multiple access (OFDMA) system to formulate a new implementation of …

This paper investigates the performance of an orthogonal frequency-division multiplexing
(OFDM)-based cognitive radio (CR) spectrum sharing communication system that assumes …

In the existing scenario, the radio spectrum is allocated and divided between unlicensed
and licensed frequencies. Due to this policy, some portions of the spectrum remain unused …

The swift expansion in the wireless technology has shaped the spectrum bandwidth scarce.
This lack of spectra has pushed the spectrum management authorities to devise new ways …

In cognitive radio (CR) systems, one of the main implementation issues is spectrum sensing
because of the uncertainties in propagation channel, hidden primary user (PU) problem …

Cognitive radio (CR) capitalizes advances in signal processing and radio technology and is
capable of reconfiguring RF and switching to desired frequency bands. It is a frequency …

We envision a scenario for opportunistic spectrum access among multiple point-to-point
links when the available spectrum is not contiguous due to the presence of external …

Over the past few decades, the world has witnessed a rapid growth in mobile and wireless
networks (MWNs) which significantly change human life. However, proliferating mobile …

Nowadays, efficient spectrum usage is one of the most important design principles to take
into account in wireless communications due to the exponential growth of mobile devices. In …