Opportunistic access has been considered by regulators for a number of different spectrum
bands. In this paper, we discuss and qualitatively evaluate techniques used in the discovery …

There is a growing demand for spectrum to accommodate future wireless services and
applications. Given the rigidity of current allocations, several spectrum occupancy studies …

Cognitive radio networks have been recognized as a promising paradigm to address the
spectrum under-utilization problem. To improve spectrum efficiency, many operations such …

Device coordination in open spectrum systems is a challenging problem, particularly since
users experience varying spectrum availability over time and location. We propose a …

A number of algorithmic and protocol assumptions taken for granted in the design of existing
wireless communication technologies need to be revisited in extending their scope to the …

Traditionally, interference protection is guaranteed through a policy of spectrum licensing,
whereby wireless systems get exclusive access to spectrum. This is an effective way to …

The new paradigm of dynamic spectrum access (DSA) networks aims to provide
opportunistic access to large parts of the underutilized spectrum. The majority of research in …

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

In legacy wireless communication systems, spectrum allocation is static, resulting in
extremely low spectrum utilization. On the other hand, there is little spectrum left for …

The continually increasing number of wireless devices operating in the unlicensed
frequency bands makes the freely-available wireless spectrum a scarce commodity. Under …