Correspondence: [email protected] 1 Institute for Theoretical Information Technology, RWTH Aachen University, Kopernikusstraße 16, 52074, Aachen, Germany Full list of author information is available at the end of the article Abstract Spectrum sensing is a crucial component of opportunistic spectrum access schemes, which aim at improving spectrum utilization by allowing for the reuse of i...

Cellular data traffic almost doubles every year, greatly straining network capacity. The main driver for this development is wireless video. Traditional methods for capacity increase (like using more spectrum and increasing base station density) are very costly, and do not exploit the unique features of video, in particular a high degree of asynchronous content reuse. In this paper we give an o...

This paper discusses sample allocation problem (SAP) in frequency-domain Compressive Sampling (CS) of timedomain signals. An analysis that is relied on two fundamental CS principles; the Uniform Random Sampling (URS) and the Uncertainty Principle (UP), is presented. We show that CS on a singleand multi-band signals performs better if the URS is done only within the band and suppress the out-ban...

Our research goal is to construct an environment that mechanically supports human intellectual activities through software development with reuse. We propose a model of software development with systematic reuse in which the existent program can be altered to meet the given speci cation change using the program deriving process from the speci cation. In this paper, we consider what kinds of kno...

WiMAX with femto-cells is a cost effective and spectrally efficient next generation broadband wireless communication systems. Femtocells are perceived as having a strong potential to provide high data-rate services with increased coverage at low cost. Femtocells will allow new services and business models to be offered to indoor users. Almost parallely, the WiMAX standard has emerged as a poten...

Metrics regarding Open Access (OA) availability for readers and the enablers of redistribution of content published in scholarly journals, i.e. content licenses, copyright ownership, and publisher-stipulated self-archiving permissions are still scarce. This study implements the four core variables (reader rights, reuse rights, copyrights, author posting rights) of the recently published Open Ac...

Our knowledge base regarding the presence and significance of chemicals foreign to the subsurface environment is large and growing—the papers in this volume serving as testament. However, complex questions with few answers surround the unknowns regarding the potential for environmental or human health effects from trace levels of xenobiotics in ground water, especially ground water augmented wi...

Ever increasing growth in cellular mobile user population, coupled with scare radio spectrum has put stringent demand on optimization of channel utilization methodology. An efficient channel reuse scheme will ensure maximum availability of idle channels for new and handoff calls. In this paper we study fixed and dynamic channel allocation schemes. An attempt has been made to propose and evaluat...

LTE networks’ main challenge is to efficiently use the available spectrum, and to provide satisfying quality of service for mobile users. However, using the same bandwidth among adjacent cells leads to occurrence of Inter-cell Interference (ICI) especially at the cell-edge. Basic interference mitigation approaches consider bandwidth partitioning techniques between adjacent cells, such as freque...

Using the enhanced data rates for GSM evolution (EDGE) system with cyclic frequency hopping as an example, we apply a Kalman-filter power control method based on interference tracking to packet voice service in wireless networks. Our results show that the power-control method significantly improves the spectral efficiency by enabling the 1/3 frequency reuse while maintaining a stringent require...