There have been increasing interests in integrating cooperative diversity into Cognitive
Radios (CRs). However, conventional cooperative diversity protocols require at least two …

Cognitive radio applications require reconfigurable RF air interfaces. We present here the
design of a reconfigurable decoupling and matching network (DMN) for a cognitive multi …

We propose a cooperative beamforming aided incremental relaying scheme to improve
spectrum efficiency of cognitive radio systems. In this scheme, the source and relays can …

Existing spectrum management policies have led to significant overallocation and
underutilization of the licensed spectrum. To address this issue, cognitive radio (CR) has …

Cognitive radio systems allow secondary users to operate on underutilized licensed
spectrum. When considering highly congested communication channels, however …

In cognitive relay systems, spectrum holes exist in 4 dimensions (4-D), namely, time,
frequency, location, and direction. How to efficiently utilize these different kinds of spectrum …

In this paper, we propose an opportunistic scheduling scheme to serve bursty traffics in
cognitive radios, where cooperative beamforming is exploited to access busy timeslots or …

We analyze the potential for using multiple transmission dimensions in a cognitive radio
network (CRN) in terms of the probability of successful communications. We consider a …

Cognitive radio (CR) nodes should be ultimately able to resolve all information-relevant
resources (frequency, space, polarization et cetera) available to unlicensed users for …

As an important multi-antenna technique, beamforming can be applied to enable concurrent
transmissions of Secondary Users (SUs) and Primary Users (PUs) in Cognitive Radio (CR) …