Searched for: subject:"beamforming"
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von den Hoff, Bieke (author)
Over the past years, noise nuisance around airports strongly increased resulting in the need for aircraft noise reduction. Therefore, the noise sources should be known. This thesis assesses a new acoustic imaging method to identify sources on aircraft fly-over measurements. The proposed Global Optimisation (GO) algorithm is based on the theory...
master thesis 2020
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Laguduvan Thyagarajan, Prithvi (author)
Stereo Thermo-Optically Enhanced Radar for Earth, Ocean, Ice, and land Dynamics (STEREOID) is one of the candidates of the ESA (European Space Agency) , Earth Explorer 10 missions. The novel constellation system will consist of the active Sentinel-1 satellites and two passive spacecrafts, which can provide flexible baseline configurations. The...
master thesis 2019
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Sparreboom, Jamey (author)
There has been a big increase in the use of social robots, such as Pepper, which use verbal communication as the main method of interacting with a human. Verbal communication with a robot is performed using Automatic Speech Recognition (ASR) to recognize words from an audio stream containing speech.<br/>These social robots are being more...
master thesis 2019
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Ahmed, Sheeraz (author)
Recent advancements in Multiple-Input Multiple-Output (MIMO) radar techniques has created a paradigm shift in the overall radar technology to increase degrees of freedom in multi-function radar capabilities. The underlying principle of MIMO transmissions is to transmit independent waveforms from each antenna-element which do not interfere with...
master thesis 2019
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Minonzio, Claudio (author)
Ultrasound is a fast, harmless, cheap and portable imaging modality. In transcranial sonography (TCS) the applications include diagnosis of brain related diseases or tracking of electrodes in deep brain stimulation (DBS) procedures. However, the skull has strong aberration effects on ultrasound and sets limits to the technology. The speed of...
master thesis 2019
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Brandetti, Livia (author)
The increase of energy consumption as well as the need to reduce green-house emissions trigger the shift from a fossil-fuel based society towards a sustainable society. With a constant increase in the installed power capacity, wind plays a key role in the global energy framework. The improvement of the technology opens up new targets for the...
master thesis 2018
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den Ouden, Olivier (author)
All over the world a so called oceanic 'hum' can be recorded, dominating the ambient noise field. The hum is generated by nonlinear interaction of ocean surface waves, radiating acoustic signals in the atmosphere and water (named microbaroms), and coupling to the solid earth as microseisms. The hum can be generated by local near-coastal sources...
master thesis 2018
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Kokke, Costas (author)
Spatial cues allow a listener to determine the direction sound is coming from. In addition, recognising spatially separated sound sources facilitate the listener to focus on specific sound sources. Because of this, preservation of spatial cues in multi-microphone hearing assistive devices is important to the listening experience and safety of...
master thesis 2018
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Salman, Salman (author)
Traditionally, antenna design involves optimizing the design parameters such as gain, minimum sidelobe level, scan range, half power beamwidth, for a particular application. Since 5G systems are pushing the boundaries for cellular communications by introducing unique challenges such as multiple beam antennas, beamforming etc. in the field of...
master thesis 2018
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Kotti, Sofia (author)
Clock synchronization among the nodes of a wireless acoustic sensor network (WASN) is a significant issue that affects the performance of multi-channel noise reduction schemes. Since independent sensors are utilized, each accompanied by its internal clock, clock offsets are inevitable, even if the mismatch in the sampling frequencies is...
master thesis 2018
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Hayat, Waqas (author)
Defence institutions and military aircraft manufacturers are increasingly exploring the ways to im- prove stealth in new aircraft designs. Design for low observability, more specifically for low Radar Cross-Section is the fundamental design aspect during design of a new military aerial vehicle. Acoustic stealth is also an important...
master thesis 2018
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Nijhof, Daniƫlle (author)
These are exciting times to work in the field of acoustics: researchers have a more granular understanding of sound than ever before due to the ability to acquire, store and analyze unprecedented amounts of acoustical data. The purpose of acoustic imaging is noise reduction. If noise can be measured, it can be reduced. Acoustic imaging is...
master thesis 2018
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Vlemmix, Christian (author)
Since both the aircraft and wind energy sectors are experiencing rapid growth, improvements must be made in terms of noise reduction as to enable growth whilst fulfilling the restrictions on noise pollution. An open-section vertical wind tunnel with an anechoic test chamber has recently been constructed at the Delft University of Technology, in...
master thesis 2017
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Anggrit Dewangkara Yudha Pinangkis, Anggrit (author)
Wireless data traffic is growing rapidly as the number of mobile devices increase and video contents become more popular. As 2.4\,GHz and 5\,GHz band communications only provide limited bandwidth, these frequency bands cannot support the demand of ultra-high data rate. Millimeter-wave (mmWave) communications promise massive available bandwidth...
master thesis 2017
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Heusinkveld, Vincent (author)
In medical ultrasound imaging phased array transducers are used for non-invasive imaging. For 3D intra-cardiac-echography technical borders are reached since blood vessel size limits the dimensions of the array. This dimensional limitation lowers lateral resolution. To solve part of the problem, non conventional ways of lateral resolution...
bachelor thesis 2017
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Fool, Fabian (author)
Currently a lot of effort is put into developing matrix arrays which allow for volumetric imaging and new applications. There are however multiple problems. Compared to arrays currently in use which have in the order of 128 elements, matrix arrays can easily contain 1000 to 10000 elements. If all elements would be connected independently, the...
master thesis 2017
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de Vreede, D.K. (author)
Bilateral cochlear implants (CIs) can restore hearing in deaf children, by electrically stimulating the auditory pathways. The effects of long-term deafness have been extensively studied and it is well known that deafness leads to cross-modal reorganization of the brain. However, the short term effects of CI use on the developing auditory...
master thesis 2016
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Vander Eyken, S. (author)
As the air travel industry steadily grows, so does the noise pollution that comes with it. This brings with it a myriad of socio-economic consequences, especially in the vicinity of airports. In order to combat this aircraft noise at its origin, it is important to know where it originates from and determine the prevalent sound sources on an...
master thesis 2016
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Nugroho, H. (author)
Optical beamforming networks (OBFNs), which consist of many small and flat antennas, called phased array antennas (PAAs), can be tuned such that the signal beam from the airplanes can be steered towards a satellite. This was proposed as a alternative to the mechanically steered antenna, which has many disadvantages. The problem of tuning a large...
master thesis 2015
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Shukla, S.Y. (author)
WLAN 802.11 (WiFi) and WPAN 802.15 (Bluetooth) operate in the same 2.4GHz ISM band. OFDM WLANs are designed to provide very high data rates, resilience to multipath and extended operating range. One of the main barriers to actually achieving the high data rates is the interference from the Bluetooth systems which is one of the main sources of...
master thesis 2015
Searched for: subject:"beamforming"
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