Bernhard Haindl

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One deployment option for the future broadband L-band digital aeronautical communications system (L-DACS) is operating as an inlay system between two adjacent channels of the distance measuring equipment (DME) system. Investigations for the broadband aeronautical multi-carrier communications (B-AMC) [1] system, one candidate for the broadband L-DACS, have(More)
In this paper, the European research project B-VHF is introduced which is funded by the European Commission and has started in January 2004. The main goal of the B-VHF project is to prove that it is feasible to establish a multi-carrier based overlay system for future air traffic control (ATC) communications in the very high frequency (VHF) band without(More)
L-DACS1 is the broadband candidate technology for the future L-band Digital Aeronautical Communications System (L-DACS). The flexible design of L-DACS1 allows the deployment as an inlay system in the spectral gaps between two adjacent channels used by the Distance Measuring Equipment (DME) as well as the non-inlay deployment in unused parts of the L-band.(More)
The B-VHF research project of the European Commission developed a concept for a multi-carrier aeronautical communications system intended to be preferably deployed within the aeronautical VHF COM band. Recently, some companies from the former B-VHF consortium were tasked by EUROCONTROL to investigate within the framework of the Future Communications Study(More)
In this paper, we introduce the B-VHF project which is funded by the European Commission and has started in January 2004. The prime goal of the B-VHF project is to verify the feasibility of broadband VHF aeronautical communications system based on multi-carrier technology and to demonstrate its benefits to the aeronautical community. The project deals with(More)
In this paper, the physical layer design of the B-VHF system is described and discussed. B-VHF is a broadband communications system for air-traffic control based on multi-carrier technology which is intended to be applied as an overlay system to the existing aeronautical communications systems in the VHF band. Special focus in this paper is put on the(More)
B-VHF is a proposal for a future aeronautical communication system in the VHF band based on an overlay concept, i.e. during the transition phase the B-VHF system shares the same frequency band with legacy VHF systems without interfering with them. In this paper, the overlay concept is evaluated by simulations of the physical and higher layers. Simulation(More)
For wafer sizes in state-of-the-art semiconductor manufacturing ranging up to 300 mm, the uniformity of processes across the wafer becomes a very important issue. We present a fully three-dimensional model for the feature scale simulation of continuum transport and reaction determined high-pressure chemical vapor deposition processes suitable for the(More)
The maximum principle is the most important property of solutions to diffusion equations. Violation of the maximum principle by the applied discretization scheme is the cause for severe numerical instabilities: the emergence of negative concentrations and, in the nonlinear case, the deterioration of the convergence of the Newton iteration. We compare finite(More)
Three simple mesh examples are presented to show that neither Delaunay nor strictly non-obtuse mesh elements are required for a finite element diffusion computation. Mesh requirements based on a recently found condition are investigated to guarantee certain properties of the resulting stiffness matrix. The experiments are conducted using the general purpose(More)