Gunar Schorcht

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System-level design presents special simulation modeling challenges. System-level models address the architectural and functional performance of complex systems. Systems are decomposed into a series of interacting subsystems. Architectures define subsystems, the interconnections between subsystems and contention for shared resources. Functions define the(More)
Networked systems in automobiles and aircraft are designed by groups of people, departments and/or companies of different expertise. Commonly used design methodologies in complex system design partition the work at high level of uncertainty into teams of specialists. These teams have to make assumptions and design decisions without being able to evaluate(More)
In this paper, we present a novel algorithm for improving localization results of unknown wireless nodes (a.k.a. unknowns or mobile nodes). Our proposed solution, Groupwise Universal Improvement Scheme (G-UnIS), is based on additional information about the a priori known distances between mobile nodes. We show with the simulation results that our method can(More)
In this paper, we present the combination of two concepts addressing important aspects for smart home services: a new quality of service concept and a new integrated concept for a smart home security system. We assume that every flat in a house has its own smart device to perform local services and act as an interface for the different sensors and actors(More)
During the next years a number of mobile satellite systems (MSS) for low earth orbits (LEO) and for medium earth orbits (MEO) will be available for global personal communications. The most important currently projected systems are Iridium, Globalstar, Odyssey, ICO (formerly Inmarsat-P), and Teledesic. These systems will provide mobile communication from any(More)
In the next few years, a new generation of mobile satellite systems (MSS) will be available. These systems will use satellites on low earth orbits (LEO) and on medium earth orbits (MEO) in order to provide personal communication from (almost) every point on the earth. A problem of LEO and MEO systems is the time-variant position of the satellites which(More)
In this paper we present a method to realize geographic network traac simulation models. Our approach is based on a hierarchy of traac producing objects. It uses the polymor-phic concept of the object-oriented programming paradigm to realize a traac simulation model for traac sink, and sources with arbitrary properties. We used the method to develop a(More)
—In this paper, several novel algorithms for improving the localization results of unknown wireless nodes are presented. All introduced algorithms extend the concept of Universal Improvement Scheme (UnIS) presented in our previous publications [1], [2]. We describe the algorithms using mathematical models and show with simulation results the effectiveness(More)
There is an increasing demand for interconnecting LAN's at high data rates, e.g. remote X-Applications. Due to the lack of B-ISDN before the second decade of the next century, satellite systems are the only alternative. We compare the End-to-End cell delay of a geostationary satellite system with a low earth orbit satellite system by means of simulation.(More)