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

Cognitive radio technology, a revolutionary communication paradigm that can utilize the
existing wireless spectrum resources more efficiently, has been receiving a growing …

Today's wireless networks are characterized by a fixed spectrum assignment policy.
However, a large portion of the assigned spectrum is used sporadically and geographical …

Compounding the confusion is the use of the broad term cognitive radio as a synonym for
dynamic spectrum access. As an initial attempt at unifying the terminology, the taxonomy of …

Cognitive radio (CR) technology is envisaged to solve the problems in wireless networks
resulting from the limited available spectrum and the inefficiency in the spectrum usage by …

Driven by regulatory initiatives and radio technology advances, opportunistic spectrum
access has the potential to mitigate spectrum scarcity and meet the increasing demand for …

Capacity is often studied under constraints on the channel input signals. This paper
investigates the behavior of capacity when constraints are placed on the channel output …

It has been 20 years since the concept of cognitive radio (CR) was proposed, which is an
efficient approach to provide more access opportunities to connect massive wireless …

Cognitive radio (CR) capitalizes advances in signal processing and radio technology and is
capable of reconfiguring RF and switching to desired frequency bands. It is a frequency …

In this paper, we provide a survey of dynamic spectrum access techniques. Various
approaches envisioned for dynamic spectrum access are broadly categorized under three …