› › Millimeter Wave Radio Over Fiber Links Based On Mode Locked Laser Diodes

Millimeter-Wave Radio-over-Fiber Links based on Mode-Locked Laser Diodes

Author : Brendel, Friederike

Publisher : KIT Scientific Publishing

Page : 324 pages

File Size : 44,3 MB

Release : 2014-05-14

Category : Technology & Engineering

ISBN : 3866449860

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Book Description

Radio communications in the range of 60 GHz enable multi-Gigabit/s network access in indoor environments. Due to the propagation characteristics of such signals only very short range radio transmission is feasible. In order to distribute these signals across large distances, analog transmission over optical fiber is considered. In this work, mode-locked laser diodes serve as optoelectronic oscillators for the generation of such signals. Their system-relevant properties are studied in detail.



RF Probe-Induced On-Wafer Measurement Errors in the Millimeter-Wave Frequency Range

Author : Mueller, Daniel

Publisher : KIT Scientific Publishing

Page : 212 pages

File Size : 26,32 MB

Release : 2018-11-22

Category : Measurement

ISBN : 3731508222

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Book Description

Measurement at millimeter-wave frequencies are prone to parasitic effects which distort the overall results. Especially the use of RF probes introduces unknown distortions, even after the measurement setup is calibrated. This works investigates these distortions based on electromagnetic field simulations of integrated circuits in conjunction with models of the used RF probes. This allows to comprehend the observed distortions and successfully resolve the root of the distortions.



Distributed Transformers for Broadband Monolithic Millimeter-Wave Integrated Power Amplifiers

Author : Pahl, Kai-Philipp Walter

Publisher : KIT Scientific Publishing

Page : 254 pages

File Size : 26,40 MB

Release : 2015-09-18

Category : Broadband amplifiers

ISBN : 373150409X

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Book Description

This work presents methods and techniques to optimize and implement distributed magnetic transformers for their application in matching networks of Monolithic Millimeter-wave Integrated Circuits (MMICs). It describes strategies for the efficiency and bandwidth optimization of the transformers and demonstrates their potential based on an optimized transformer geometry as well as two MMIC power amplifiers.





Modeling Backscattering Behavior of Vulnerable Road Users Based on High-Resolution Radar Measurements

Author : Abadpour, Sevda

Publisher : KIT Scientific Publishing

Page : 194 pages

File Size : 44,63 MB

Release : 2023-11-20

Category :

ISBN : 3731513161

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Book Description

During the evolvement of autonomous driving technology, obtaining reliable 3-D environmental information is an indispensable task in approaching safe driving. The operational behavior of automotive radars can be precisely evaluated in a virtual test environment by modeling its surrounding, specifically vulnerable road users (VRUs). Such a realistic model can be generated based on the radar cross section (RCS) and Doppler signatures of a VRU. Therefore, this work proposes a high-resolution RCS measurement technique to determine the relevant scattering points of different VRUs.



Realization Limits of Impulse-Radio UWB Indoor Localization Systems

Author : Zwirello, Lukasz

Publisher : KIT Scientific Publishing

Page : 226 pages

File Size : 45,38 MB

Release : 2014-05-06

Category : Technology & Engineering

ISBN : 3731501147

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Book Description

In this work, the realization limits of an impulse-based Ultra-Wideband (UWB) localization system for indoor applications have been thoroughly investigated and verified by measurements. The analysis spans from the position calculation algorithms, through hardware realization and modeling, up to the localization experiments conducted in realistic scenarios. The main focus was put on identification and characterization of limiting factors as well as developing methods to overcome them.



Multi-User Gesture Recognition with Radar Technology

Author : Ninos, Alexandros

Publisher : KIT Scientific Publishing

Page : 164 pages

File Size : 21,21 MB

Release : 2022-10-27

Category : Technology & Engineering

ISBN : 3731512254

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Book Description

The aim of this work is the development of a Radar system for consumer applications. It is capable of tracking multiple people in a room and offers a touchless human-machine interface for purposes that range from entertainment to hygiene.





High-Precision Automotive Radar Target Simulation

Author : Diewald, Axel

Publisher : KIT Scientific Publishing

Page : 190 pages

File Size : 22,33 MB

Release : 2023-08-15

Category :

ISBN : 3731512963

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Book Description

Radar target simulators (RTSs) deceive a radar under test (RuT) by creating an artificial environment consisting of virtual radar targets. In this work, new techniques are presented that overcome the rasterization deficiency of current RTS systems and enable the generation of virtual targets at arbitrary high-precision positions. This allows for continuous movement of the targets and thus a more credible simulation environment.



Intelligent Reflecting Surfaces in Wireless Communication Systems

Author : Li, Yueheng

Publisher : KIT Scientific Publishing

Page : 246 pages

File Size : 48,98 MB

Release : 2024-02-23

Category :

ISBN : 373151334X

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Book Description

Accompanied with the development of the wireless communication technologies, the high data traffic is more necessary for civil and industrial applications than ever The concept of an intelligent reflective surface (IRS) has attracted considerable attention recently as a low-cost solution. As the main contribution, the dissertation creates new state-of-the-art and formulates a solid milestone for the IRS research field.