Cognitive Radio (CR) Mitola (2000) is a promising technology to improve spectrum utilization of wireless communication systems. Current investigations in CR have been focused on the physical layer functionality. The cognitive radio, built on a software-defined radio, assumes that there is an underlying system hardware and software infrastructure that is capable of supporting the flexibility nee...

1.1 Introduction Under utilization of radio spectrum in traditional wireless communications systems [30], along with the increasing spectrum demand from emerging wireless applications, is driving the development of new spectrum allocation policies for wireless communications. These new spectrum allocation policies, which will allow unlicensed users (i.e., secondary users) to access the radio sp...

Dynamic spectrum access is a must-have ingredient for future sensors that are ideally cognitive. The goal of this paper is a tutorial treatment of wideband cognitive radio and radar-a convergence of (1) algorithms survey, (2) hardware platforms survey, (3) challenges for multi-function (radar/communications) multi-GHz front end, (4) compressed sensing for multi-GHz waveforms-revolutionary A/D, ...

Cognitive radio technology, a revolutionary communication paradigm that can utilize the existing wireless spectrum resources more efficiently, has been receiving a growing attention in recent years. As network users need to adapt their operating parameters to the dynamic environment, who may pursue different goals, traditional spectrum sharing approaches based on a fully cooperative, static, an...

The talk features the R&D work being conducted in the two European Union funded projects C2POWER and EUWB. The former project deals with the development of multi-radio devices with cognitive functionalities for saving power by means of short range cooperative techniques. The second project looks at cognitive radio based techniques for the coexistence of UWB frequency band wireless technologies....

Cognitive Radio (CR) is a comparatively new technology in which problems like underutilization of spectrum and spectrum scarcity is solved based on the revolutionary ideas. Cognitive Radio allows group of users to identify and access to available spectrum resources for their optimum use. Recent studies show that most of the assigned spectrum is underutilized. On the other hand, the increasing n...

Cognitive radio networks hold the key to achieving better radio bandwidth utilization and improving the quality of wireless applications. In this paper we design a scenario for cognitive routing to improve wireless ad hoc network performance in terms of power consumption in transmit, receive and ideal modes, as well as reducing the collision of relaying on the network, without declining end-to-...

Cognitive radio reduces the spectral inefficiency by sensing the under and over utilized parts of the spectrum and then redistributing the transmission to ensure that the spectrum is used efficiently. The awareness about spectrum usage is obtained by spectrum sensing. Cyclostationary feature detections one of the spectrum sensing techniques for cognitive radio. In this paper, we detect the pres...

Widely regarded as one of the most promising emerging technologies for driving the future development of wireless communications, cognitive radio has the potential to mitigate the problem of increasing radio spectrum scarcity through dynamic spectrum allocation. Drawing on fundamental elements of information theory, network theory, propagation, optimization, and signal processing, a team of lea...