Spectrum sensing is a key technology in the study of cognitive radios, but its attributes are easily influenced by the channel fading. Compared with singleuser spectrum sensing, multiple-user spectrum sensing can overcome the impacts caused by the fading environment of cognitive radio. Since diversity technology has been proved to provide the system high transmission rate and high link reliabil...

Cognitive radio (Mitola III, 2000) also known as opportunistic spectrum access (OSA) has emerged as a promising solution to increase the spectrum efficiency Haykin (2005). In OSA, the SU finds spectrum holes (white space) by sensing the radio frequency spectrum. The presence of spectrum holes in the PU channels are highlighted in Fig. 1. These spectrum holes are used by the SU for its transmiss...

Cognitive Radio (CR) is an intelligent wireless communication system to solve spectral clogging problem and increasing bandwidth utilization for next generation wireless communication applications. Computationally and energy efficient spectrum sensing for detecting spectrum holes in wideband radio spectrum still remains a challenge. The cognitive nodes which are far away from primary user (PU) ...

As wireless communications become more important to daily life, the wireless research community must create more efficient and useful radios to satisfy the rising needs for spectrum. The cognitive radio work covered in this paper addresses the spectrum and communications issues. Cognitive radios are aware, flexible, and intelligent, and they allow a radio to understand the wireless environment ...

Cognitive radio (CR) technology seems to be a promising candidate for solving the radio frequency (RF) spectrum occupancy problem. CRs strive to utilize the white holes in the RF spectrum in an opportunistic manner. Because interference is an inherent and a very critical design parameter for all sorts of wireless communication systems, many of the recently emerging wireless technologies prefer ...

In our paper published in [1], the delay performance of cognitive radio networks for point-to-point and point-to-multipoint communications have been studied. In this report, additional numerical results are provided to give more insights into the impact of system parameters on the delay performance of the considered cognitive radio network scenarios.

We propose the data mining-informed cognitive radio, which uses non-traditional data sources and data-mining techniques for decision making and improving the performance of a wireless network. To date, the application of information other than wireless channel data in cognitive radios has not been significantly studied. We use a novel dataset (Twitter traffic) as an indicator of network load in...

Cognitive Radio plays a major part in communication technology by resolving the shortage of the spectrum through usage of dynamic spectrum access and artificial intelligence characteristics. The element of spectrum sharing in cognitive radio is a fundamental approach in utilising free channels. Cooperatively communicating cognitive radio devices use the common control channel of the cognitive r...

In order to improve the spectrum utilization, cognitive networks have been proposed. A cognitive network can reuses the spectrum of licensed user in a way such that the services of the licensed users are not disrupted harmfully. This paper presents the optimization of interference generated by a secondary network to a primary network for a cognitive radio (CR) networks using genetic algorithm (...