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Richtungsaufgelöste Kanalmodellierung und Systemstudien für Mehrantennensysteme in urbanen Gebieten

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Book Series: Karlsruher Forschungsberichte aus dem Institut für Hochfrequenztechnik und Elektronik ISSN: 18684696 ISBN: 9783866444201 Year: Volume: 56 Pages: XX, 291 p. DOI: 10.5445/KSP/1000012610 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:01:57
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Das vorliegende Buch bietet eine umfassende Analyse des urbanen Mehrnutzer-MIMO-Funkkanals und stellt ein neuartiges geometrisch-stochastisches Kanalmodell für diesen Kanal vor. Besonderes Augenmerk liegt dabei auf der realistischen Modellierung der Zeitvarianz, Frequenz- und Richtungsselektivität sowie der Nutz- und Interferenzsignale im Netz. Zur Parametrierung und Verifikation des Modells werden Ray Tracing Simulationen sowie beidseitig richtungsaufgelöste Funkkanalmessungen eingesetzt.

Analysis and design of multiple element antennas for urban communication

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Book Series: Karlsruher Forschungsberichte aus dem Institut für Hochfrequenztechnik und Elektronik ISSN: 18684696 ISBN: 9783866445130 Year: Volume: 59 Pages: XI, 140 p. DOI: 10.5445/KSP/1000017825 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:02:01
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This work focuses on the analysis and design of multiple element antennas (MEA) and their interaction with the propagation channel. In particular, attention is given to urban channels and how its information throughput, i.e. capacity, can be improved. With this in mind, this work extends an existing network model of the communication system in order to reduce computation time, investigates the communicational limits of MEA systems and proposes a synthesis method for capacity maximization.

Synthese kapazitätsoptimierter Antennensysteme mit messtechnischer Verifikation

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Book Series: Karlsruher Forschungsberichte aus dem Institut für Hochfrequenztechnik und Elektronik ISSN: 18684696 ISBN: 9783731507376 Year: Volume: 88 Pages: xviii, 183 p. DOI: 10.5445/KSP/1000076629 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-28 18:37:01
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This work describes an optimization concept for mobile antenna systems. The so-called antenna synthesis determines optimal fixed antenna radiation patterns with the help of simulated or measured transmission channels. These radiation patterns increase the spectral efficiency and the reliability of the antenna system compared to conventional antennas with omnidirectional radiation patterns. Therefor the antenna systems are matched as best as possible to the predominant directions of the channel.

Dreidimensional bildgebendes Radarsystem mit digitaler Strahlformung für industrielle Anwendungen

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Book Series: Karlsruher Forschungsberichte aus dem Institut für Hochfrequenztechnik und Elektronik ISSN: 18684696 ISBN: 9783731502494 Year: Volume: 75 Pages: XVI, 203 p. DOI: 10.5445/KSP/1000042368 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:01:59
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The contactless detection of the presence and position of objects is required in many areas of the industry. Therefore, a three-dimensional measuring radar sensor, including corresponding methods for signal processing, is designed and realized. By exemplary measurement scenarios, the capability of the radar system for positioning and imaging of the environment in three dimensions is successfully demonstrated, which opens up new areas of application.

Adaptive and Intelligent Temperature Control of Microwave Heating Systems with Multiple Sources

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Book Series: Karlsruher Forschungsberichte aus dem Institut für Hochleistungsimpuls- und Mikrowellentechnik ISSN: 21922764 ISBN: 9783731504672 Year: Volume: 8 Pages: XIII, 231 p. DOI: 10.5445/KSP/1000051503 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:02:02
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In this work, an innovative real-time microwave control approach is proposed, to improve the temperature homogeneity under microwave heating. Multiple adaptive or intelligent control structures have been developed, including the model predictive control, neural network control and reinforcement learning control methods. Experimental results prove that these advanced control methods can effectively reduce the final temperature derivations and improve the temperature homogeneity.

Novel Insights into Orbital Angular Momentum Beams: From Fundamentals, Devices to Applications

Authors: --- --- --- --- et al.
ISBN: 9783039212231 / 9783039212248 Year: Pages: 164 DOI: 10.3390/books978-3-03921-224-8 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Physics (General) --- Optics and Lights
Added to DOAB on : 2019-12-09 11:49:15
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It is well-known by now that the angular momentum carried by elementary particles can be categorized as spin angular momentum (SAM) and orbital angular momentum (OAM). In the early 1900s, Poynting recognized that a particle, such as a photon, can carry SAM, which has only two possible states, i.e., clockwise and anticlockwise circular polarization states. However, only fairly recently, in 1992, Allen et al. discovered that photons with helical phase fronts can carry OAM, which has infinite orthogonal states. In the past two decades, the OAM-carrying beam, due to its unique features, has gained increasing interest from many different research communities, including physics, chemistry, and engineering. Its twisted phase front and intensity distribution have enabled a variety of applications, such as micromanipulation, laser beam machining, nonlinear matter interactions, imaging, sensing, quantum cryptography and classical communications. This book aims to explore novel insights of OAM beams. It focuses on state-of-the-art advances in fundamental theories, devices and applications, as well as future perspectives of OAM beams.

Visible Light Communication and Positioning

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ISBN: 9783039214358 / 9783039214365 Year: Pages: 144 DOI: 10.3390/books978-3-03921-436-5 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Added to DOAB on : 2019-12-09 11:49:16
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In recent years, wireless communications have significantly evolved due to the advanced technology of smartphones;, portable devices; and the rapid growth of Internet of Things, e-Health, and intelligent transportation systems . Moreover, there is anare increasing need fors of emerging intelligent services like positioning and sensing in athe future intelligence society. Recent years have witnessed the growing research interests and activities in the communication and intelligencet services in the optical wireless spectrum, as a complementary technology to more

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