Today’s cellular telecommunications markets require continuous monitoring and intervention by regulators in order to balance the interests of various stakeholders. In order to reduce the extent of regulatory involvements in the day-to-day business of cellular operators, the present paper proposes a “selfregulating” spectrum market regime named “society spectrum”. This regime provides a market-i...

Increasing data volumes delivered by a new generation of radio interferometers require computationally efficient and robust calibration algorithms. In this paper, we propose distributed calibration as a way of improving both computational cost as well as robustness in calibration. We exploit the data parallelism across frequency that is inherent in radio astronomical observations that are recor...

This paper outlines a new applicaton of the technique of drift scanning, for single-dish radio continuum measurements within a radome. A radome scatters varying amounts of ground radiation into the receiver feed for di erent antenna positions, causing di cult-to-cancel total power uctuations as astronomical sources are tracked. Parking the telescope and allowing a source to drift through the be...

Currently, spatial signal processing for adaptive source separation and interference cancellation are extensively discussed for application in future mobile radio systems. ESPRIT-type algorithms are especially concerned because of their low arithmetic complexity and their inherent ability for superresolution estimation of the direction of arrival (DoA) [1]. The latter is also true for mobile ra...

In this work, we provide the implementation and analysis of a cognitive transceiver for opportunistic networks. We focus on a previously introduced dynamic spectrum access (DSA) cognitive radio (CR) solution for primary-secondary coexistence in opportunistic orthogonal frequency division multiplexing (OFDM) networks, called cognitive interference alignment (CIA). The implementation is based on ...

The process of developing and enhancing a mobile radio system is a very ambitious task due to the inherent complexity and the manifold dynamics of such networks. Essentially, the problem leads to an analysis of the interferences between radio resources of limited number. Since the problem cannot be solved analytically, comprehensive simulation is a reasonable means to tackle it. Earlier, only s...

A software modem for Meteor Burst Communication (MBC) is presented. The software is running on a DSP board, connected to a PC for user interface. MBC is a unique type of radio communication, which is suitable for non-realtime remote data collection. Forward scattering of radio waves from ionized trails of meteors provides reliable communication channel for path lengths from 300 to 2000 km and i...

-The inherent broadcast capabilities of satellites make them an attractive solution for the delivery of multimedia services to mobile users in third generation (3G) networks. Reliable delivery of content over a hostile landmobile satellite channel is one of the key technical system requirements that can be addressed at different protocol layers. In this paper, we focus our attention on two of t...

Cognitive radio ad hoc networks (CRAHNs) are a class of cognitive radio networks. In recent years, they have gained popularity, and routing protocols have been proposed. Above all, the protocols based on on-demand routing are considered favorable in the literature. It is mainly because the accomplishments of ad hoc on-demand distance vector (AODV) routing and dynamic source routing (DSR) in mob...

A wireless sensor integrates a radio to facilitate the exchange of data by wireless communications. In recent years, wireless sensors have rapidly matured with current platforms offering performance levels on par with traditional tethered sensors. The elimination of extensive wiring typical of tethered monitoring systems keeps the cost of wireless monitoring systems low. In addition to the incl...