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Dissertations / Theses on the topic 'Massive array'

Author: Grafiati

Published: 4 June 2025

Last updated: 15 July 2025

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1

Rozé, Antoine. "Massive MIMO, une approche angulaire pour les futurs systèmes multi-utilisateurs aux longueurs d’onde millimétriques." Thesis, Rennes, INSA, 2016. http://www.theses.fr/2016ISAR0014/document.

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La densification des réseaux allant de pair avec le déploiement de petites cellules, les systèmes Massive MIMO disposent de caractéristiques prometteuses pour accroître la capacité des réseaux au travers des techniques de formation de faisceau, appelées beamforming. Les transmissions aux longueurs d’onde millimétriques (mmWave) sont, quant à elle, très convoitées car, non seulement les bandes passantes exploitables sont extrêmement larges, mais le canal de propagation est principalement Line-of-Sight (LOS), ce qui correspond à la visibilité directe entre le terminal et la station de base. L’at

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2

Lotti, Marina, and Marina Lotti. "Experimental characterization of millimeter-wave radars for mapping and localization." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/19891/.

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L’attività di tesi è inquadrata nell’ambito del progetto europeo PRIMELOC (Personal Radars for Radio Imaging and Infrastructure-less Localization) il cui scopo è quello di validare il concetto di radar personale per fornire servizi automatici di localizzazione e di mappatura degli ambienti indoor, evitando l’introduzione di infrastrutture ad hoc. Per far ciò, si vogliono sfruttare i dispositivi di future generazioni wireless che usano onde millimetriche, per costruire mappe di luoghi indoor. Le mappe sono ottenute scannerizzando l’ambiente circostante attraverso l’uso di massive antenna arrays

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3

Wannas, Hussain. "Full Duplex Multiuser MIMO with Massive Arrays." Thesis, Linköpings universitet, Institutionen för systemteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-105268.

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Half-Duplex Multiuser Multiple-Input Multiple-Output (HD MU-MIMO) systemscurrently employed in communication systems are not experiencing the selfinterference(SI) problem but they are not optimal in terms of efficiency and interms of resources used (time and frequency resources). Ignoring the effect of largescalefading, we start by explaining the uplink (UL) and downlink (DL) parts ofthe MU-MIMO system and how the sum-rate is calculated. We also introduce thethree linear receivers/precoders, Maximum-Ratio Combining (MRC)/Maximum-Ratio Transmission (MRT), Zero-Forcing (ZF), and Minimum Mean-Squ

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4

Savaş, Süleyman. "Linear Algebra for Array Signal Processing on a Massively Parallel Dataflow Architecture." Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-4137.

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<p>This thesis provides the deliberations about the implementation of Gentleman-Kung systolic array for QR decomposition using Givens Rotations within the context of radar signal processing. The systolic array of Givens Rotations is implemented and analysed using a massively parallel processor array (MPPA), Ambric Am2045. The tools that are dedicated to the MPPA are tested in terms of engineering efficiency. aDesigner, which is built on eclipse environment, is used for programming, simulating and performance analysing. aDesigner has been produced for A

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Savaş, Süleyman. "Linear Algebra for Array Signal Processing on a Massively Parallel Dataflow Architecture." Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-2192.

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<p>This thesis provides the deliberations about the implementation of Gentleman-Kung systolic array for QR decomposition using Givens Rotations within the context of radar signal </p><p>processing. The systolic array of Givens Rotations is implemented and analysed using a massively parallel processor array (MPPA), Ambric Am2045. The tools that are dedicated to the MPPA are tested in terms of engineering efficiency. aDesigner, which is built on eclipse environment, is used for programming, simulating and performance analysing. aDesigner has been p

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6

Kunz, Eben A. "Low cost analog signal processing for massive radio telescope arrays." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/77079.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 38).<br>Measurement and analysis of redshifted 21cm hydrogen emissions is a developing technique for studying the early universe. The primary time of interest corresponds to a signal in the the 100-200MHz frequency band. The Omniscope is a new type of radio telescope array being developed at MIT which images the entire sky in this band at low resolution using spatial Fourier transforms. In order

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7

Khanfar, Husni. "Implementing CAL Actor Component on Massively Parallel Processor Array." Thesis, Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-14080.

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8

Sewell, Carleton Paul. "Massively parallel circuit simulation on the distributed array processor." Thesis, Queen Mary, University of London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285163.

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9

Pasila, Felix <1974&gt. "Inverse Static Analysis of Massive Parallel Arrays of Three-State Actuators via Artificial Intelligence." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5907/1/Pasila_Felix_tesi.pdf.

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Massive parallel robots (MPRs) driven by discrete actuators are force regulated robots that undergo continuous motions despite being commanded through a finite number of states only. Designing a real-time control of such systems requires fast and efficient methods for solving their inverse static analysis (ISA), which is a challenging problem and the subject of this thesis. In particular, five Artificial intelligence methods are proposed to investigate the on-line computation and the generalization error of ISA problem of a class of MPRs featuring three-state force actuators and one degree of

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Pasila, Felix <1974&gt. "Inverse Static Analysis of Massive Parallel Arrays of Three-State Actuators via Artificial Intelligence." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5907/.

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Massive parallel robots (MPRs) driven by discrete actuators are force regulated robots that undergo continuous motions despite being commanded through a finite number of states only. Designing a real-time control of such systems requires fast and efficient methods for solving their inverse static analysis (ISA), which is a challenging problem and the subject of this thesis. In particular, five Artificial intelligence methods are proposed to investigate the on-line computation and the generalization error of ISA problem of a class of MPRs featuring three-state force actuators and one degree of

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11

Biswas, Sudip. "Future cellular systems : fundamentals and the role of large antenna arrays." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/23470.

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In this thesis, we analyze the performance of three promising technologies being considered for future fifth generation (5G) and beyond wireless communication systems, with primary goals to: i) render 10-100 times higher user data rate, ii) serve 10-100 times more users simultaneously, iii) 1000 times more data volume per unit area, iv) improve energy efficiency on the order of 100 times, and iv) provide higher bandwidths. Accordingly, we focus on massive multiple-input multiple-output (MIMO) systems and other future wireless technologies, namely millimeter wave (mmWave) and full-duplex (FD) s

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12

Dallmeyer, Matthew John. "Reducing Fir Filter Costs: A Review of Approaches as Applied to Massive Fir Filter Arrays." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1417544448.

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13

Walsh, Declan. "Design and implementation of massively parallel fine-grained processor arrays." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/design-and-implementation-of-massively-parallel-finegrained-processor-arrays(e0e03bd5-4feb-4d66-8d4b-0e057684e498).html.

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This thesis investigates the use of massively parallel fine-grained processor arrays to increase computational performance. As processors move towards multi-core processing, more energy-efficient processors can be designed by increasing the number of processor cores on a single chip rather than increasing the clock frequency of a single processor. This can be done by making processor cores less complex, but increasing the number of processor cores on a chip. Using this philosophy, a processor core can be reduced in complexity, area, and speed to form a very small processor which can still perf

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Savas, Suleyman. "Implementation and Evaluation of MPEG-4 Simple Profile Decoder on a Massively Parallel Processor Array." Thesis, Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-14549.

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The high demand of the video decoding has pushed the developers to implement the decoders on parallel architectures. This thesis provides the deliberations about the implementation of an MPEG-4 decoder on a massively parallel processor array (MPPA), Ambric 2045, by converting the CAL actor language implementation of the decoder. This decoder is the Xilinx model of the MPEG-4 Simple Profile decoder and consists of four main blocks; parser, acdc, idct2d and motion. The parser block is developed in another thesis work [20] and the rest of the decoder, which consists of the other three blocks, is

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15

Alagoda, Geoffrey N. "VLSI implementation of a massively parallel wavelet based zerotree coder for the intelligent pixel array." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2001. https://ro.ecu.edu.au/theses/1078.

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In the span of a few years, mobile multimedia communication has rapidly become a significant area of research and development constantly challenging boundaries on a variety of technologic fronts. Mobile video communications in particular encompasses a number of technical hurdles that generally steer technological advancements towards devices that are low in complexity, low in power usage yet perform the given task efficiently. Devices of this nature have been made available through the use of massively parallel processing arrays such as the Intelligent Pixel Processing Array. The Intelligent P

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16

Negoi, Andy Catalin. "Composant virtuel et ses processeurs de simulation." Grenoble INPG, 1998. http://www.theses.fr/1998INPG0116.

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L'objectif de ce travail est d'elaborer un simulateur de composant microelectronique autonome a l'aide de circuits integres specialises. C'est toujours l'evolution technologique de ces dernieres annees en terme de densite des circuits integres numeriques qui a rendu possible une telle approche. Ce simulateur, que nous appellerions composant virtuel, peut avoir deux types d'utilisation possibles : soit faire des simulations physiques de composant grace a un concept permettant des vitesses de calcul tres elevees, soit comme outil pedagogique. La methode de simulation par la technique de monte-ca

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17

Kövamees, Johan. "Electrically Steerable Phased-Arrays for 5G Sub-6 GHzMassive MIMO Active Antenna Units : Re-configurable Feed Networks." Thesis, Uppsala universitet, Institutionen för elektroteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-420712.

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During this project we have designed a new type of antenna that uses an array of antenna elements in order to emit electromagnetic radiation as signals and to be able to control the beam. After an extended time the design yielded a simulation which had the correct characteristics. After printing and constructing a prototype of the antenna it was tested in an anechoic chamber at Uppsala University. The array was divided into two different sub-arrays: the upper and the lower sub-arrays. Each of these consisted in itself of two sides: the long and the short sides. Each side had seven radiating el

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18

Jouda, Mazin [Verfasser], and J. G. [Akademischer Betreuer] Korvink. "Innovative Concepts for the Electronic Interface of Massively Parallel MRI Phased Imaging Arrays / Mazin Jouda. Betreuer: J. G. Korvink." Karlsruhe : KIT-Bibliothek, 2016. http://d-nb.info/1108451543/34.

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Dimassi, Sarra. "Identification de gènes responsables d'épilepsies de l'enfant." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1114.

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L'épilepsie est une affection neurologique chronique qui se définit par la répétition de crises épileptiques, signe de l'hyperactivité paroxystique d'un groupe de neurones corticaux. Ces dernières années, plusieurs gènes responsables d'épilepsies monogéniques ont été mis en évidence. Notre travail avait pour objectif l'identification d'anomalies génétiques responsables ou favorisants certaines formes d'épilepsies de l'enfant. Ce travail est composé de quatre études complémentaires. La première était l'exploration pangénomique d'une cohorte de 47 patients porteurs d'épilepsie à paroxysme roland

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20

Sage, Eric. "Nouveau concept de spectrométre de masse à base de réseaux de nanostructures résonantes." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENY045/document.

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L'enjeu du travail est d'apporter une preuve de concept d'une architecture simplifiée de spectromètre en utilisant comme détecteur un réseau ultra-dense de NEMS associés à des éléments de circuit CMOS afin d'amplifier le signal in situ et de les adresser individuellement. Depuis plusieurs années, l'équipe du professeur Roukes à CALTECH a présenté une démonstration de spectrométrie de masse avec un NEMS. En parallèle, le CEA/LETI-MINATEC a développé une approche de fabrication dite VLSI de NEMS et de simulation électromécanique de ces éléments. Le premier but de la thèse est l'étude des phénomè

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Ståhl, Patrik L. "Methods for Analyzing Genomes." Doctoral thesis, KTH, Genteknologi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12407.

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The human genome reference sequence has given us a two‐dimensional blueprint of our inherited code of life, but we need to employ modern‐day technology to expand our knowledge into a third dimension. Inter‐individual and intra‐individual variation has been shown to be larger than anticipated, and the mode of genetic regulation more complex. Therefore, the methods that were once used to explain our fundamental constitution are now used to decipher our differences. Over the past four years, throughput from DNA‐sequencing platforms has increased a thousand‐fold, bearing evidence of a rapid develo

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Dovelos, Konstantinos. "Terahertz communications: Physical layer enablers and analysis." Doctoral thesis, Universitat Pompeu Fabra, 2021. http://hdl.handle.net/10803/673252.

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Undoubtedly, spectrum scarcity constitutes the main bottleneck of current wireless networks. It is therefore imperative to move beyond the sub-6 GHz band in order to overcome this limitation. Toward this direction, terahertz (THz) communication is deemed a promising solution for future wireless systems owing to the abundant spectrum resources at these frequencies. Despite the prospect of terabit- per-second wireless links, THz signals suffer from severe propagation losses, which can undermine the communication range and performance of THz systems. In this dissertation, we tackle this chal

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Nguyen, Van-Nghi. "Principes alternatifs pour la détection de masse ultime via la dynamique non linéaire de capteurs résonants M/NEMS." Thesis, Lyon, INSA, 2013. http://www.theses.fr/2013ISAL0160/document.

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Les capteurs résonants de type M/NEMS sont largement utilisés dans l’environnement biologique pour la mesure de masse de biomolécules en raison de leur grande précision combinée à une taille réduite. Classiquement, la détection et la quantification se basent sur le décalage fréquentiel induit par la masse ajoutée. Toutefois, ce décalage devient très faible et difficile à distinguer du bruit de mesure lorsque les masses considérées sont très petites. Il est théoriquement possible de gagner encore un ou plusieurs ordres de grandeur en résolution avec ces méthodes fréquentielles en diminuant enco

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Larabi, Islam Amine. "Nouveaux produits de synthèse : analyse, consommation et métabolisme ; Applications cliniques et médicolégales Rapid and simultaneous screening of new psychoactive substances and conventional drugs of abuse. A comparative study of Biochip Array Technology versus LC-MS/MS in whole blood and urine Development of a sensitive untargeted liquid chromatography– high resolution mass spectrometry screening devoted to hair analysis through a shared MS2 spectra database: A step toward early detection of new psychoactive substances Validation of an UPLC-MS/MS method for the determination of sixteen synthetic cannabinoids in human hair. Application to document chronic use of JWH-122 following a non-fatal overdose Development and validation of liquid chromatography-tandem mass spectrometry targeted screening of 16 fentanyl analogs and U-47700 in hair: Application to 137 authentic samples Prevalence and Surveillance of Synthetic Cathinones Use by Hair Analysis: An Update Review Prevalence of New Psychoactive Substances(NPS) and conventional drugs of abuse (DOA) in high risk populations from Paris(France) and its suburbs A cross sectional study by hair testing(2012–2017) Evaluation of drug abuse by hair analysis and self-reported use among MSM under PrEP: Results from a sub-study of the ANRS-IPERGAY trial. Hair testing for 3‑fluorofentanyl, furanylfentanyl, methoxyacetylfentanyl, carfentanil, acetylfentanyl and fentanyl by LC–MS/MS after unintentional overdose Drug‐facilitated sexual assault (DFSA) involving 4‐methylethcathinone (4‐MEC),3,4‐Methylenedioxypyrovalerone (MDPV), and doxylamine highlighted by hair analysis Metabolic Profiling of Deschloro-N-ethyl-ketamine (O-PCE) and identification of new target metabolites in urine and hair using human liver microsomes and high-resolution accurate mass spectrometry." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASL029.

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L’objectif de ce travail a été de développer deux approches analytiques dédiées à l’analyse toxicologique des nouveaux produits de synthèse (NPS) dans différentes matrices biologiques (sang, urine et cheveux). La première est basée sur le criblage non ciblé par chimiluminescence sur biopuces et chromatographie liquide couplée à la spectrométrie de masse haute résolution (LC-HRMS) et la deuxième correspond à un criblage ciblé par spectrométrie de masse en tandem (LC-MS/MS). Ces deux approches ont ensuite été appliquées dans des études observationnelles pour évaluer la consommation de NPS dans d

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25

Broecker, Sebastian. "Aufbau und Anwendung einer Methode zur Identifizierung und Quantifizierung von Giften und deren Metaboliten in Blut und Haaren in der Systematischen Toxikologischen Analyse mittels Flüssigchromatographie-Quadrupol-Flugzeitmassenspektrometrie-Kopplung (LC-QTOF-MS)." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2012. http://dx.doi.org/10.18452/16461.

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Die Systematische Toxikologische Analyse (STA) stellt auf Grund der großen Vielfalt und der ständigen Zunahme an toxikologisch relevanten Substanzen eine der größten Herausforderungen in der chemischen Analyse dar. In der vorliegenden Arbeit wurde daher die Eignung der Flüssigchromatographie in Kombination mit der Hybrid-Quadrupol-Flugzeitmassenspektrometrie (LC-QTOF-MS) für diesen Zweck untersucht. Dazu wurden eine Datenbank mit über 7360 und eine CID-Spektrenbibliothek mit mehr als 2720 toxikologisch relevanten Substanzen erstellt und geeignete Probenvorbereitungsmethoden entwickelt. Die Erp

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KUO, YUNG-JUI, and 郭永睿. "RF and Baseband Integrated Design of Massive Multibeam Phased-Array Transmitter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/w8skn3.

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碩士<br>國立中正大學<br>電機工程研究所<br>105<br>A 64-element active antenna transmitter array system is presented in this thesis, which is aimed for the fifth-generation mobile communication. There are 16 RF Transmitting chain, which chain is composed of RF circuits including power amplifier, variable attenuator, quadrature modulator, reflection-type phase shifter, and injection-lock oscillator, and microcontroller for monitoring circuit health states and beamforming controlled codes. The measurement results show the distinct angle and multiple beam generation in a 120° sector. For the simple beam case, the

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Andrade, Rooderson Martines de. "Optimization of Spectrum Management in Massive Array Antenna Systems with MIMO." Master's thesis, 2018. http://hdl.handle.net/10400.6/9726.

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Fifth generation (5G), is being considered as a revolutionary technology in the telecommunication domain whose the challenges are mainly to achieve signal quality and great ability to work with free spectrum in the millimetre waves. Besides, other important innovations are the introduction of a more current architecture and the use of multiple antennas in transmission and reception. Digital communication using multiple input and multiple output (MIMO) wireless links has recently emerged as one of the most significant technical advances in modern communications. MIMO technology is able to offer

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HSIEH, CHENG-YU, and 謝承育. "A Research on Codebooks Design and Channel Estimation for Massive Antenna Array." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/86132364495029504691.

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碩士<br>國立中正大學<br>通訊工程研究所<br>104<br>Millimeter-wave (mmWave) wireless communication systems can enable high data rates due to the high bandwidth available at the mmWave bands. To alleviate the severe attenuation in the mmWave channels, one possible solutios is to deploy large antenna arrays at both transmitter and receiver. Channel estimation and and accurate beamforming techniques therefore arise as two important research topics in this system. In the first part of this thesis, we study the channel estimation problem using hierarchical beambook. Some modification of the existing channel estimat

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Nadeem, Qurrat-Ul-Ain. "Full-Dimension Massive MIMO Technology for Fifth Generation Cellular Networks." Diss., 2018. http://hdl.handle.net/10754/629869.

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Full dimension (FD) multiple-input multiple-output (MIMO) technology has recently attracted substantial research attention in the 3rd Generation Partnership Project (3GPP) as a promising technique for the next-generation of wireless communication networks. FD-MIMO scenarios utilize a planar two-dimensional (2D) active antenna system (AAS) that not only allows a large number of antenna elements to be placed within feasible base station (BS) form factors, but also provides the ability of elevation beamforming. This dissertation presents the elevation beamforming analysis for cellular networks ut

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WANG, YING-CHIEH, and 王英傑. "RF and Baseband Integrated Design of Massive Phased-Array Transceiver and Implementation of Multibeam Pattern Measurement System." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/qmgpur.

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碩士<br>國立中正大學<br>電機工程研究所<br>104<br>This thesis focuses on two research items, which are the RF-basedband transceiver co-design and the multi-beam pattern measurement platform for 5G massive array. First, on the RF-basedband transceiver co-design, a microwave network model was developed, where ADC converter, analog baseband circuit blocks, RF circuit blocks, and antenna array are characterized by the measured or simulated scattering parameter matrices. Therefore, the impedance mismatch of antenna, RF and basedband circuits, ADC quantization error, process variation error, and mutual coupling amo

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Loukil, Mohamed Habib. "Index Modulation Schemes for Terahertz Communications." Thesis, 2021. http://hdl.handle.net/10754/669001.

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Terahertz (THz)-band communication is envisioned as a critical technology that could satisfy the need for much higher data rates in sixth generation wireless communi- cation (6G) systems and beyond. Although THz signal propagation suffers from huge spreading and molecular absorption losses that limit the achievable commu- nication ranges, ultra-massive multiple-input multiple-output (UM-MIMO) antenna arrays can introduce the required beamforming gains to compensate for these losses. The reconfigurable UM-MIMO systems of small footprints motivate the use of spatial modulation techniques. Furthe

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Teixeira, José Nuno Azeredo Gomes. "Massively parallel transmit arrays at 7T: innovative array elements and geometries." Master's thesis, 2016. http://hdl.handle.net/10451/25707.

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Tese de mestrado integrado em Engenharia Biomédica e Biofísica, apresentada à Universidade de Lisboa, através da Faculdade de Ciências, 2016<br>O trabalho desenvolvido com ressonância magnética de campo ultra elevado, nomeadamente campos magnéticos de 7 Tesla e superiores, tem demonstrado melhorias no desempenho de imagem quando comparado com intensidades de campo menores (1.5/3 Tesla) devido ao incremento intrínseco da razão sinal-ruído (SNR). Embora seja esta a tendência geral, este aumento no desempenho não é linearmente aplicável a todas as estruturas do corpo humano, tanto que, não tinha

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Bouça, Patrícia Alexandra Pereira. "Antenna arrays for massive MIMO 5G and satellite systems." Master's thesis, 2018. http://hdl.handle.net/10773/25601.

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Wireless telecommunications systems are growing and improving at a breakneck pace, and its demands must be ful lled with hardware modi cations. The fth-generation will demand a revolution since antennas are going to be designed for high frequency, millimeter wave bands, where there is a lot of unexploited spectrum worldwide. However, these frequencies get absorbed quite easily, for example, they su er high attenuation due to rain. This implies a decrease of radiated power. To solve some of the issues, antenna arrays have been studied due to their high versatility. This dissertation h

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HUANG, FANG-YING, and 黃芳瑩. "Efficient Direction-of-Arrival Estimation for Massive Uniform Rectangular Arrays." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/e695xw.

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碩士<br>嶺東科技大學<br>資訊科技系碩士班<br>107<br>Massive multiple input multiple output (MIMO) system has become a crucial technology meeting the ever-increasing data consumption demand, for it has more channel capacity, higher frequency spectrum efficiency, and reliability. The problem of direction of arrival (DOA) estimation has a marked impact on massive MIMO system capacity and frequency spectrum efficiency. This thesis deals with two-dimensional (2D) DOA estimation with low computational load for MIMO systems. It is well known that the 2D multiple signal classification (MUSIC) method can be used for DO

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Figueiredo, Ricardo José Coelho de. "Nonlinear characterization of antenna arrays for 5G applications." Master's thesis, 2018. http://hdl.handle.net/10773/28517.

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The present mobile scenario demands are stretching the existing telecom infrastructure to the limit. New technologies centred around antenna arrays and spatial multiplexing have been proposed to overcome the challenges imposed by these demands. This work overviews the mobile scenario, scrutinizing demands, presented solutions, challenges and the industry’s perspective of the Fifth Generation of mobile communications. From a careful analysis, the 5G’s most critical radio frequency hardware issues are detailed, and a long-term approach to address them is presented. On the short-term the work foc

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