Cognitive radios hold tremendous promise for increasing spectral efficiency in wireless
systems. This paper surveys the fundamental capacity limits and associated transmission …

Due to the under-utilization problem of the allocated radio spectrum, cognitive radio (CR)
communications have recently emerged as a reliable and effective solution. Among various …

For the fully connected K user wireless interference channel where the channel coefficients
are time-varying and are drawn from a continuous distribution, the sum capacity is …

In cognitive radio (CR) systems, the spectrum efficiency (SE) of the secondary users (SUs) is
always limited by the interference temperature constraint imposed on the primary users …

In cognitive radio (CR) networks, there are scenarios where the secondary (lower priority)
users intend to communicate with each other by opportunistically utilizing the transmit …

We provide achievability as well as converse results for the degrees of freedom region of a
multiple-input multiple-output (MIMO) X channel, ie, a system with two transmitters, two …

Cognitive Radio Communications and Networks gives comprehensive and balanced
coverage of the principles of cognitive radio communications, cognitive networks, and …

The concept of cognitive radio (or secondary spectrum access) is currently under
investigation as a promising paradigm to achieve efficient use of the frequency resource by …

Cognitive radio (CR) design aims to increase spectrum utilization by allowing the secondary
users (SUs) to coexist with the primary users (PUs), as long as the interference caused by …

Cognitive radios are promising solutions to the problem of overcrowded spectrum. In this
article we explore the throughput potential of cognitive communication. Different …