Cognitive Radio (CR) is an important future wireless radio access technology having the potential to solve the spectrum scarcity and under-utilization problems. Using CR however, poses new challenges for network nodes and architectures due to the inherent complexity of cognitive radio technology. In this paper, we propose a unique database-driven “Channel Profiler Framework” for cognitive radio...

We report on radio observations of the M8.5 dwarf LSR J1835+3259 and the L3.5 dwarf 2MASS J00361617+1821104, which provide the strongest evidence to date that the electron cyclotron maser instability is the dominant mechanism producing radio emission in the magnetospheres of ultracool dwarfs. As has previously been reported for the M9 dwarf TVLM 513-46546, periodic pulses of 100% circularly pol...

Abstract: The dimensioning of hardware components takes place at the end of the UMTS radio network planning process when a suitable NodeB site configuration has been found. Each connection to a NodeB requires a service specific number of hardware components and an incoming connection is blocked if not enough components are available. The aim of hardware dimensioning is to find the cost-optimal ...

adiated emission from electronic equipment, co-located to a digital radio receiver, can affect receiving performance. It is therefore of great importance that this undesired emission be considered in the early design phase of a system containing radio equipment. For this purpose, methods to estimate the performance degradation on digital radio receivers in such environment must be available. Fr...

Cooperative wide-band spectrum sensing has been considered to enable cognitive radio operation of wireless regional area networks (WRAN) in the UHF and VHF TV broadcasting bands. In this paper, cooperative compressed spectrum sensing is considered to enable fast sensing of the wide-band spectrum. The speed and accuracy of spectrum sensing are improved by further optimization of the compressed s...

This paper explores the potential for statistical epoch of re-ionization (EOR) measurements using wide field LOFAR observations. New developments in low frequency radio instrumentation and wide field signal processing allow very sensitive EOR measurements, and the analysis techniques enabled by these advances offer natural ways of separating the EOR signal from the residual foreground emission....

Recently, technological advances have enabled the development of a range of widely and readily available location aware technologies (LAT) and geosensor systems. Trajectory data resulting from these technologies is however affected by at least two important sources of spatiotemporal uncertainty. First, trajectories are typically approximated as a sequence of spatiotemporal sample points that ar...

Recent theoretical developments for observing the epoch of reionization (EOR) have concentrated on the power spectrum signature of redshifted 21 cm emission. These studies have demonstrated the great potential of statistical EOR observations; however, the sensitivity calculations for proposed low-frequency radio arrays have been highly approximate. The formalism developed for interferometric me...