Several measurement campaigns have shown that numerous spectrum bands are vacant
although licenses have been issued by the regulatory agencies. Dynamic spectrum access …

Dynamic spectrum access (DSA) has been proposed as a solution to the spectrum scarcity
problem. However, the models for spectrum use, that are commonly used in DSA research …

This paper describes the results from a series of long-term observations of spectrum
occupancy in the range 300 MHz-4.9 GHz made at a single location. Over 6 months of data …

Regulatory bodies have predicted an impending shortage in commercial radio frequency
spectrum in the near future. However, due to outdated regulatory practices, many of these …

In this paper we present a thorough study of spectrum sensing performance in cognitive
radio (CR) scenarios where the primary user (PU) transmission is not continuous. In …

Channel occupancy rate (COR) is the fraction of the time that a channel is occupied, ie,
contains signal (s) in addition to noise. Estimation of COR is important, eg, in cognitive radio …

This paper describes the current efforts underway to set up matched long-term continuously
running spectrum observatories in the US (in Chicago and Blacksburg) and in Turku …

Inefficient spectrum usage is a crucial issue in wireless communications and methods for
dynamic spectrum access are proposed based on spectrum sensing methodology of the …

Dynamic spectrum access networks are designed to allow today's bandwidth hungry"
secondary devices" to share spectrum allocated to legacy devices, or" primary users." The …

Se describen los elementos fundamentales que componen la radio cognitiva y se analiza la
asignación de bandas espectrales. Dentro de los principales problemas en la inserción de …