Searched for: subject%3A%22Wideband%22
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Bosma, Sjoerd (author)
DESHIMA is a superconducting on-chip spectrometer using MKIDs in the sub-mm wavelength regime (240-720 GHz, 1:3 bandwidth). This thesis presents (1) an analysis of the quasi-optical system used for DESHIMA on the ASTE telescope in Chile (2) design of the room-temperature optics of this design and (3) a preliminary investigation into an ultra...
master thesis 2017
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Cancrinus, Nick (author), Max, Gyula (author)
Nowadays, localization of cars is mostly done using GPS. Some major disadvantages of this method are that it is not very accurate and that it cannot be used indoors. These disadvantages do not form a major problem when an active human driver is controlling the car, but will become more critical when the autonomy of vehicles increases. The goal...
bachelor thesis 2017
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Šabanović, Armin (author), van Katwijk, Alexander (author), Verton, Pim (author)
In this report, an indoor target detection system is developed for detecting one or multiple targets in a cluttered area based on a network of distributed ultra-wideband radars. The system is capable of acquisition of data in the form of distances between radar and targets, which can be used to localise and track one or multiple targets in real...
bachelor thesis 2017
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Wieffering, Tristan (author), Arriëns, Roy (author)
A system has been developed that utilises the techniques of Ultra Wideband and Synthetic Aperture Radar to produce top view images of a scene using measurements from the side. The system consists of the PulsON P410 radar module, a set of antennas, a moving platform and an imaging algorithm. This thesis will cover all the aspects of the data...
bachelor thesis 2017
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Zhou, L. (author)
master thesis 2016
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Bruinsma, W.P. (author), Hes, R.P. (author), Kroep, H.J.C. (author), Leliveld, T.C. (author), Melching, W.M. (author), Aan de Wiel, T.A. (author)
This document describes the design process of a software toolkit to perform high-performance wideband spectrum sensing. A prominent application of this is Cognitive Radio, a technique that aims to make more efficient use of the available radio spectrum. An extensive theoretical analysis will be performed. Various non-uniform sampling techniques...
bachelor thesis 2015
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Wang, M. (author)
The focus of this thesis is to design a dielectric covered discone WLAN antenna working under the protocols of IEEE802.11 a/b/g/n. It has the wideband operation of discone antennas and the compact dimensions of dielectric resonator antennas which is compatible with the latest main protocol WLAN applications. This antenna has an ultra-wide...
master thesis 2015
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He, J. (author)
Currently the Doherty Power Amplifier (DPA) is replacing the traditional Class B amplifier in base-station and broadcast applications, as such becoming the preferred choice of industry due to its simplicity and high efficiency performance. In spite of its success, so far practical DPA implementations can provide only a very limited RF bandwidth,...
master thesis 2013
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Mehta, N. (author)
master thesis 2013
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Basavarajappa, V. (author)
The use of radars in detecting low flying, small targets is being explored for several decades now. However radar with counter-stealth abilities namely the passive, multistatic, low frequency radars are in the focus recently. Passive radar that uses Digital Video Broadcast Terrestrial (DVB-T) signals as illuminator of opportunity is a major...
master thesis 2012
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Li, J. (author)
This thesis aims for high power wideband amplifiers suitable for base station instrumentation purposes. A power combing topology is introduced, not only to achieve high power but also good input and output matching. Two kinds of broadband 3-dB quadrature couplers, which are important components in the power combing topology, are designed and...
master thesis 2011
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Motoroiu, S. (author)
In the last couple of years, mobile telephony has truly become global, with more than 4 billion users worldwide nowadays (compared to less than 1bn ten years ago). This has represented a boost not just for the mobile phones industry, but also for that of wireless infrastructure. Larger-scale production and increased competition have transformed...
master thesis 2011
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Mishra, G. (author)
The fast development of CMOS IC process technology and the opening up of high frequency bands by regulatory bodies has aided wireless communication industry with development and commercialization of long-medium and short range wireless communication applications, for example GSM, Wireless LAN, Bluetooth and UWB. Ultra Wideband (UWB) is a...
master thesis 2010
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Wang, Y. (author)
Vanwege vertrouwelijke informatie of andere redenen is slechts een deel van de publicatie opgenomen in de repository. Due to confidential information or other reasons only a part of the publication is presented in the repository. Wideband Class-B power amplifier is required in Modern communication systems. The bandwidth limitation of Class-B...
master thesis 2010
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Deng, X. (author)
Vanwege vertrouwelijke informatie of andere redenen is slechts een deel van de publicatie opgenomen in de repository. Due to confidential information or other reasons only a part of the publication is presented in the repository. Doherty Power Amplifier (DPA) is employed to improve the efficiency when operated with complex modulated signals. Due...
master thesis 2010
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Zhang, T. (author)
Conventional RF power amplifiers are normally designed for peak efficiency at maximum output power. However, for WCDMA application, the power amplifier often operates at 6-8 dB power back-off. Consequently, when the power is backed-off from its peak point, the efficiency of conventional power amplifier drops sharply. The envelope elimination and...
master thesis 2009
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Bokiye, A.M. (author)
The demand for high data rate is ever increasing. OFDM-based wideband systems such as LTE and WiMAX are being employed as they can provide such high data rates. The performances of these systems not only depend on SNR but also on wideband arameters such as delay spread and angular spread. Obstacles (buildings, trees, vehicles, lamp posts, etc.)...
master thesis 2009
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Alam, M. (author)
This thesis presents mainly the impact of the timing error on a synchronous and on an asynchronous multirate Direct-Sequence (DS) Code Division Multiple Access (CDMA) system based on variable spreading code technique using multistage parallel interference cancellation (PIC) detection. The performances of the multi-code (MC) access system with...
master thesis 1998
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Mank, A.R. (author)
For future mobile multimedia communication, a Mobile Broadband System is in development, which operates at a frequency of 60 GHz. In order to get a better understanding of 60 GHz propagation effects in different environments with different conditions, several measurements were performed, using a spectrum analyzer and synthesized signal generator...
master thesis 1998
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Maranatha, L.D. (author)
Wideband indoor propagation measurements at 2.4, 4.75 and 11.5 GHz which were collected at the FEL-TNO laboratory, are statistically evaluated. The correlation of power delay profiles received within a short distance is examined for line of sight and obstructed cases. The variation of the Rician factor K, rms delay spread, dominant power and the...
master thesis 1995
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