In this survey paper, we characterize the learning problem in cognitive radios (CRs) and
state the importance of artificial intelligence in achieving real cognitive communications …

Cognitive radio is widely expected to be the next Big Bang in wireless communications.
Spectrum sensing, that is, detecting the presence of the primary users in a licensed …

Cognitive radio allows for usage of licensed frequency bands by unlicensed users.
However, these unlicensed (cognitive) users need to monitor the spectrum continuously to …

In this paper, we consider the problem of detecting a primary user in a cognitive radio
network by employing multiple antennas at the cognitive receiver. In vehicular applications …

Spectrum sensing is a key component of the cognitive radio paradigm. Primary signals are
typically detected with uncalibrated receivers at signal-to-noise ratios (SNRs) well below …

Cognitive radio has attracted an increasing amount of interest over the past few years as an
effective method of alleviating the spectrum scarcity problem in wireless communications …

This paper studies the transmit strategy for a secondary link or the so-called cognitive radio
(CR) link under opportunistic spectrum sharing with an existing primary radio (PR) link. It is …

Polarization is an important property of electromagnetic waves. It has shown the great
application potential in optical fiber, radar, and satellite communications, where polarization …

Spectrum sharing has attracted a lot of attention in cognitive radio recently as an effective
method of alleviating the spectrum scarcity problem by allowing unlicensed users to coexist …

We consider the spectrum sensing problem in cognitive radio networks. We offer a
framework for optimal joint detection and parameter estimation when the secondary users …