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Dissertations / Theses on the topic 'Modulation de phase spatiale'

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Published: 4 June 2021
Last updated: 13 February 2022

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1

LING, LAI-CHANG. "PHOTOEMITTER MEMBRANE SPATIAL LIGHT MODULATOR (SIGNAL PROCESSING, PHASE MODULATION)." Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/183921.

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Advantages of optics over electronics in signal processing derive from the fact that many operations, such as addition, multiplication, correlation, and filtering, can be performed in parallel on two-dimensional data samples. However, this advantage is attainable only if information can be input/output or processed at sufficient speed and space bandwidth. Although acousto-optic devices have been used to provide impressive throughput, they are inherently one-dimensional and do not possess any information-storage capability beyond the acoustic transit time (≤50 μs). Hence, a high-resolution high
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2

Uhl, Brecken. "Direct Spatial Antenna Modulation for Wideband Phase Control." International Foundation for Telemetering, 2010. http://hdl.handle.net/10150/604278.

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ITC/USA 2010 Conference Proceedings / The Forty-Sixth Annual International Telemetering Conference and Technical Exhibition / October 25-28, 2010 / Town and Country Resort & Convention Center, San Diego, California<br>Direct spatial antenna modulation (DSAM) is a new approach to phased array control that opens up new "smart antenna" architecture possibilities. The DSAM technique leverages the inherent spatial differences of excitation in an antenna in a novel way to achieve the equivalent of conventional modulation and beam control effects. Smart antenna techniques are of potentially increasin
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3

Abelard, Clément. "Micro modulateur spatial de lumière transmissif pour modulation de phase et d’amplitude." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT092/document.

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Le LETI possède un savoir-faire permettant de réaliser des micro modulateurs spatiaux de lumière (Spatial Light Modulators, SLMs) réalisés en technologie microélectronique sur silicium, ayant des très grandes résolutions et de très petits pas de pixels. Le LETI souhaite utiliser une technologie LCD particulière (la technologie IPS) dont d’une part les performances électro-optiques dans le domaine des micro-écrans ne sont pas connues mais d’autre part permet de garder des coûts réduits et de réduire le nombre d’étapes de fabrication. L’objectif de cette thèse est d’évaluer sur la base de simula
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4

Gardner, Mark Charles. "Phase object pattern recognition by optical correlation using a liquid crystal display for spatial phase modulation." Thesis, University College London (University of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409700.

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5

Kelly, Thu-Lan. "Liquid crystal spatial light modulators as computer controlled optical elements /." Title page, contents and abstract only, 1997. http://web4.library.adelaide.edu.au/theses/09PH/09phk298.pdf.

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6

Othman, Rami. "Study of reception techniques for aeronautical telemetry modulations." Thesis, CentraleSupélec, 2019. http://www.theses.fr/2019CSUP0012.

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La télémesure aéronautique est un système utilisé pendant la phase des essais en vol qui consiste à transmettre en temps-réel les données mesurées à bord de l'avion vers une station sol par le biais d'une liaison radiofréquence. Elle est une opération critique visant à surveiller le comportement de l’avion et à garantir la sécurité du pilote. La conception et les performances des émetteurs et des récepteurs ont été améliorées au fil des années mais tout en gardant la même famille de modulation utilisée pour transmettre les données. Ces données sont modulées par une modulation à phase continue
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7

Roth, Matthias, Jörg Heber, and Klaus Janschek. "System design of programmable 4f phase modulation techniques for rapid intensity shaping: A conceptual comparison." SPIE, 2016. https://tud.qucosa.de/id/qucosa%3A35096.

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The present study analyses three beam shaping approaches with respect to a light-efficient generation of i) patterns and ii) multiple spots by means of a generic optical 4f-setup. 4f approaches share the property that due to the one-to-one relationship between output intensity and input phase, the need for time-consuming, iterative calculation can be avoided. The resulting low computational complexity offers a particular advantage compared to the widely used holographic principles and makes them potential candidates for real-time applications. The increasing availability of high-speed phase mo
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Roth, Matthias, Jörg Heber, and Klaus Janschek. "Concept for the fast modulation of light in amplitude and phase using analog tilt-mirror arrays." SPIE, 2017. https://tud.qucosa.de/id/qucosa%3A35124.

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The full complex, spatial modulation of light at high frame rates is essential for a variety of applications. In particular, emerging techniques applied to scattering media, such as Digital Optical Phase Conjugation and Wavefront Shaping, request challenging performance parameters. They refer to imaging tasks inside biological media, whose characteristics concerning the transmission and reflection of scattered light may change over time within milliseconds. Thus, these methods call for frame rates in the kilohertz range. Existing solutions typically offer frame rate capabilities below 100 Hz,
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9

Hällstig, Emil. "Nematic Liquid Crystal Spatial Light Modulators for Laser Beam Steering." Doctoral thesis, Uppsala University, Quantum Chemistry, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4693.

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<p>Laser beam control is important in many applications. Phase modulating spatial light modulators (SLMs) can be used to electronically alter the phase distribution of an optical wave-front and thus change the direction and shape of a laser beam. Physical constraints set limitations to the SLM and an ideal phase distribution can usually not be realised. In order to understand how such components can be used for non-mechanical beam control three nematic liquid crystal (NLC) SLMs have been thoroughly characterised and modelled.</p><p>The pixel structure and phase quantisation give a discrepancy
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10

Wattellier, Benoit. "Amelioration des performances des chaines lasers solides utilisant l'amplification a derive de frequence : nouveaux reseaux de diffraction a haute tenue au flux et mise en forme programmable de faisceaux lasers par modulation de la phase spatiale." Palaiseau, Ecole polytechnique, 2001. http://www.theses.fr/2001EPXX0027.

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Ce memoire de these porte sur l'amelioration des performances des lasers de puissance. Cette optimisation a d'abord porte sur l'amelioration du composant le plus sensible d'une installation laser utilisant l'amplification a derive de frequence (chaine 100tw au luli), a savoir le reseau du compresseur soumis a l'eclairement le plus eleve. Dans une seconde periode, des techniques de correction de front d'onde ont ete experimentee d'une part pour ameliorer la focalisation des faisceaux, d'autre part pour controler la repartition spatiale de l'energie dans le volume focal. Deux nouvelles technique
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11

Ranshaw, M. J. "Phase-modulating spatial light modulators." Thesis, University of Edinburgh, 1988. http://hdl.handle.net/1842/14252.

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12

Uhl, Brecken. "Direct Spatial Antenna Modulation for Phased-Array Applications." International Foundation for Telemetering, 2009. http://hdl.handle.net/10150/606129.

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ITC/USA 2009 Conference Proceedings / The Forty-Fifth Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2009 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>New technologies are sought to meet the requirements of evolving telemetry capabilities such as new operating bands, increased test article and ground segment collaboration, and on-the-fly quality of service (QOS) management. Smart antennas may contribute to this evolution by directing signal energy where and when it is needed. Direct spatial antenna modulation (DSAM) represents a new approach
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13

Zimnicki, James John. "Spatial Heterodyne Imaging Using a Broadband Source." University of Dayton / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1519143422981263.

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14

Allain, Guillaume. "Analyseur de front d'onde d'ordres inférieurs à modulation spatiale." Master's thesis, Université Laval, 2019. http://hdl.handle.net/20.500.11794/35027.

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L’imagerie directe pour la détection et l’identification d’exoplanètes apporte un lot de nouveaux défis en instrumentation astronomique. L’utilisation de coronographes à haut contraste nécessite que les aberrations du système optique ainsi que la turbulence atmosphérique soient très bien corrigées afin de supprimer la lumière de l’étoile de façon à pouvoir détecter clairement les objets moins brillants qui pourraient se trouver à proximité de celle-ci. Il devient donc nécessaire d’utiliser des analyseurs de front d’onde spécialisés dans la détection rapide des bas ordres (typiquement les fines
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15

Zhong, Jia. "Exploring the Three-Dimensional Regional Myocardial Function in Transgenic Mouse Models of Cardiac Diseases using Novel MR Tissue Tracking Techniques." Case Western Reserve University School of Graduate Studies / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1247260314.

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16

Sanner, Nicolas. "Mise en forme programmable de faisceau laser femtoseconde pour le micro-usinage et la photoinscription de guides d'ondes." Phd thesis, Université Jean Monnet - Saint-Etienne, 2005. http://tel.archives-ouvertes.fr/tel-00122731.

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Ce travail de thèse porte sur la mise en forme spatiale de faisceau laser à impulsions ultra-brèves pour l'optimisation des interactions laser-matière.<br />La première partie de ce mémoire expose la conception et la réalisation d'un système d'optique adaptative permettant la mise en forme spatiale de faisceau au point focal d'une lentille. Ce dispositif original est basé sur un modulateur de front d'onde à cristaux liquides, utilisé comme lame de phase programmable de haute résolution. Une correction fine des aberrations du faisceau est démontrée, de manière à obtenir une surface d'onde quasi
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17

Silvester, Anna-Marie. "Space-time continuous phase modulation." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/14721.

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The combination of Space-Time (ST) coding and Continuous-Phase Modulation (CPM) produces a low power, energy efficient communication scheme suitable for wireless transmission. Space-time coding increases the reliability of transmission, and continuous-phase modulation (CPM) has the potential to provide considerable energy savings. CPM is a modulation technique that involves the transmission of a signal with continuous-phase and a constant envelope, where the continuous-phase property produces a very bandwidth efficient signal, and the constant-envelope property enables non linear (and thus ene
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18

Thompson, Steve C. "Constant envelope OFDM phase modulation /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2005. http://wwwlib.umi.com/cr/ucsd/fullcit?p3208635.

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19

Harrold, William. "Detection of continuous phase modulation." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235856.

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The use of coded modulations such as continuous phase modulation (CPM) can improve the power and bandwidth efficiency of digital communication links. The price paid for these gains is in increased receiver complexity. The power efficiency attainable with the highly redundant signal sets employed by coded modulations becomes limited by the ability of the receiver to achieve accurate carrier phase synchronisation. Power efficiency is assessed in terms of the bit error rate performance in white Gaussian noise. A new CPM detector called the partially coherent Viterbi algorithm (PCVA) is introduced
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20

Pethe, Akshay. "SUPER RESOLUTION 3D SCANNING USING SPATIAL LIGHT MODULATOR AND BAND CORRECTION." UKnowledge, 2008. http://uknowledge.uky.edu/gradschool_theses/550.

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Multi Frequency Phase Measuring Profilometry is the most popular lateral contact 3-D Scanning technique. The Phase Measuring Profilometry is limited in resolution by the projector and cameras used. Conventional signal projectors have a maximum of 2000 to 4000 scan lines limiting the projector resolution. To obtain greater detail with higher resolution the PMP technique is applied to a Spatial Light Modulator (SLM) having 12000 lines, very large as compared to conventional projectors. This technology can achieve super resolution scans having varied applications. Scans achieved from PMP suffer f
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21

Sinclair, Gary F. "Cross-phase modulation in rubidium-87." Thesis, St Andrews, 2009. http://hdl.handle.net/10023/735.

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22

Kleyn, Werner Frederick. "Decoding algorithms for continuous phase modulation." Master's thesis, University of Cape Town, 2002. http://hdl.handle.net/11427/6984.

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Includes bibliographical references.<br>Continuous Phase Modulation (CPM) possesses characteristics that make it very attractive for many applications. Efficient non-linear power amplifiers can be used in the transmitters of constant envelope CPM schemes. CPM also allows for the use of simple limiters in the demodulator rather than linear receivers with gain control. These characteristics not only increases the life of the power source, but it improves circuit reliability since less heat is generated. In some applications, such as satellite transmitters, where power and circuit failure is very
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23

Davis, Kyle. "Radio frequency photonic in-phase and quadrature-phase vector modulation." Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50354.

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The focus of this thesis is to investigate the implementation of Radio Frequency (RF) In-Phase and Quadrature-Phase (I/Q) vector modulation through the use of modern photonic components and sub-systems which offer extremely wide RF intrinsic bandwidths. All-electronic vector modulators suffer from frequency coverage limitations and amplitude and phase instability due to components such as phase shifters and variable gain controllers operating at or near 100\% bandwidth. In stark contrast, once an RF signal has been modulated onto an optical carrier, the percent bandwidth of the RF to carrier
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24

Aboujaoude, Andrea E. "Nanopatterned Phase-Change Materials for High-Speed, Continuous Phase Modulation." University of Dayton / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1538243834791942.

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25

Karoubi, Bruno. "Etude de la phase spatiale en vue de l'analyse d'images." Lyon, INSA, 1999. http://www.theses.fr/1999ISAL0080.

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Le travail porte sur l'étude de l'intérêt de l'information de phase spatiale pour le traitement des images bidimensionnelles. Dans ce cadre, nous avons essayé d'unifier la notion de phase spatiale en nous appuyant sur le concept de transformation de Hilbert multidimensionnelle ainsi que sur celui d'image analytique. Une telle définition unifiée de l'image de phase spatiale permet, sur le plan théorique, de concevoir de nouvelles familles de techniques de phase spatiale liée à l'image réelle de départ. Elle offre, sur le plan pratique, la possibilité de choisir de manière optimale le type d'ima
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26

Zhao, Qing. "Advanced Synchronization Techniques for Continuous Phase Modulation." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10486.

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The objective of this research work is to develop reliable and power-efficient synchronization algorithms for continuous phase modulation (CPM). CPM is a bandwidth and power efficient signaling scheme suitable for wireless and mobile communications. Binary CPM schemes have been widely used in many commercial and military systems. CPM with multilevel symbol inputs, i.e., M-ary CPM, can achieve a higher data rate than binary CPM. However, the use of M-ary CPM has been limited due to receiver complexity and synchronization problems. In the last decade, serially concatenated CPM (SCCPM) has drawn
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27

Nazare, Julie-Anne. "Modulation de la phase postprandiale du glucose." Phd thesis, Université Claude Bernard - Lyon I, 2009. http://tel.archives-ouvertes.fr/tel-00878436.

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La réduction des excursions glycémiques postprandiales a été proposée comme un moyen pour limiter le risque de développement du diabète de type 2. L'intérêt s'est donc porté sur les outils nutritionnels susceptibles de moduler la biodisponibilité des glucides et ainsi leur impact sur la glycémie postprandiale. Les travaux réalisés au cours de cette thèse avaient pour but d'étudier les effets de différents ingrédients modifiant la biodisponibilité du glucose, non seulement sur la glycémie postprandiale à court terme (2 heures) mais aussi sur les cinétiques du débit d'apparition et de disparitio
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28

Jia, Zhihong. "Structural modulation and phase transitions in melilites." [S.l.] : [s.n.], 2005. http://archiv.ub.uni-marburg.de/diss/z2005/0066/.

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29

Gao, Jason. "Equalisation for carrierless amplitude and phase modulation." Curtin University of Technology, Western Australian Telecommunications Research Institute (WATRI), 2002. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=14683.

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Carrierless amplitude and phase (CAP) modulation is generally regarded as a bandwidth efficient two-dimensional (2-D) passband line code. It is closely related to the pulse amplitude modulation (PAM) and quadrature amplitude modulation (QAM) schemes. CAP has been proposed for various digital subscriber loop (DSL) systems over unshielded twisted pairs of copper wires. In this thesis, our main focus is on the minimum mean-square error (MMSE) performance of the ideal (i.e., infinite length) linear and non-linear (decision feedback) CAP receivers/equalisers in the presence of additive, coloured Ga
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30

Szeto, Victor F. "Iterative decoding of coded continuous phase modulation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0003/MQ40953.pdf.

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31

Saleem, Sajid. "Frequency-domain equalization for continuous phase modulation." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50391.

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Continuous phase modulation~(CPM) is a non-linear, constant-envelope modulation scheme with memory, known for its bandwidth and power efficiency. Multi-h CPM uses multiple modulation indices in successive symbol intervals to improve the error performance as compared to single-h CPM~(basic CPM that utilizes only a single modulation index). One of the major applications of multi-h CPM is in aeronautical telemetry systems. Modern aeronautical devices host an increasing number of sensors, which can transmit flight testing data to the ground station. However, this excess data transfer increases the
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32

Long, Geraldine Margaret. "Phase modulation polarisation dependence in liquid crystals." Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620056.

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33

Harrison, James Ashley. "All-optical processing using cross-phase modulation." Thesis, Aston University, 2005. http://publications.aston.ac.uk/8020/.

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The following thesis presents results obtained from both numerical simulation and laboratory experimentation (both of which were carried out by the author). When data is propagated along an optical transmission line some timing irregularities can occur such as timing jitter and phase wander. Traditionally these timing problems would have been corrected by converting the optical signal into the electrical domain and then compensating for the timing irregularity before converting the signal back into the optical domain. However, this thesis posses a potential solution to the problem by remaining
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34

Li, Wensheng. "Study of hybrid permutation frequency phase modulation." Thesis, University of Ottawa (Canada), 1996. http://hdl.handle.net/10393/9723.

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In future communication applications, it is desirable to provide good system performance and more services to a number of users using the minimum resources. These expectations pose challenges in the design of modulation and coding. This thesis presents and studies the hybrid permutation frequency phase modulation (HPM) communication systems. By combining FSK and PSK, the signal energy per symbol is increased. Applying this type of signals to permutation modulation, the concept of HPM is presented and its signal properties have been mathematically analyzed. The expression for bandwidth efficien
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35

Damodaran, Kanagaraj. "Turbo Product Code with Continuous Phase Modulation." International Foundation for Telemetering, 2008. http://hdl.handle.net/10150/606222.

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ITC/USA 2008 Conference Proceedings / The Forty-Fourth Annual International Telemetering Conference and Technical Exhibition / October 27-30, 2008 / Town and Country Resort & Convention Center, San Diego, California<br>A basic problem statement in aeronautical telemetry has been to develop communication systems with good detection efficiency coupled with good spectral efficiency. Shaped-offset quadrature phase shift keying (SOQPSK) is a spectrally more efficient form of continuous phase modulation (CPM) as opposed to pulse code modulation/frequency modulation (PCM/FM). With these modulation te
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36

Renouf, Benjamin. "Matériaux et procédés pour la modulation spatiale de l’émissivité électronique d’une cathode thermoïonique." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1224.

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L’objectif de cette thèse est l’étude et la démonstration de la faisabilité d’un procédé de fabrication fiable et reproductible permettant la création d’un dispositif de modulation spatiale de l’émissivité électronique à la surface d’une cathode thermoïonique. Ce procédé doit permettre le maintien de la géométrie de la carte d’émissivité tout au long de la durée de vie opérationnelle de la cathode. Le premier sujet d’étude a donc été de mettre au point un procédé de dépôt localisé de deux types de couches minces : un matériau à faible travail de sortie pour les zones émissives et un matériau à
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Buistard, Philip J. "Phase-stable amplification of coherent molecular rotational dynamics for molecular phase modulation." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540131.

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38

Takashima, Yuzuru, Guanghao Chen, and Bo E. Miller. "Eigenmode multiplexing with SLM for volume holographic data storage." SPIE-INT SOC OPTICAL ENGINEERING, 2017. http://hdl.handle.net/10150/626290.

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The cavity supports the orthogonal reference beam families as its eigenmodes while enhancing the reference beam power. Such orthogonal eigenmodes are used as additional degree of freedom to multiplex data pages, consequently increase storage densities for volume Holographic Data Storage Systems (HDSS) when the maximum number of multiplexed data page is limited by geometrical factor. Image bearing holograms are multiplexed by orthogonal phase code multiplexing via Hermite- Gaussian eigenmodes in a Fe: LiNbO3 medium with a 532 nm laser at multiple Bragg angles by using Liquid Crystal on Silicon
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39

Perrins, Erik Samuel. "Reduced Complexity Detection Methods for Continuous Phase Modulation." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd969.pdf.

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40

Maw, Rachel Leigh. "Space-time Coded Systems with Continuous Phase Modulation." Thesis, University of Canterbury. Electrical and Computer Engineering, 2007. http://hdl.handle.net/10092/1185.

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Space-time coded systems developed in the last ten years have been designed primarily using linear modulation. Non-linear continuous phase modulation has desirable constant envelope properties and considerable potential in space-time coded systems. The work in this thesis is focussed on developing and analysing an integrated space-time coded continuous phase modulated (STC-CPM) system. The coding of the space-time encoder and the modulation is incorporated into a single trellis encoder. This allows state combining, which leads to complexity reduction due to the reduced number of states
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Ismail, K. S. "Speed-changing of induction motors by phase modulation." Thesis, University of Bristol, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.232792.

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42

Chapelle, Gregory P. "Continuous phase modulation for the indoor wireless channel /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1998. http://wwwlib.umi.com/cr/ucsd/fullcit?p9824644.

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43

Nosheen, Shabeena. "Flexo electro-optic liquid crystals for phase modulation." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/289439.

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Soft matter, self-assembled 3D photonic structures such as blue phase liquid crystals have of great interest to the displays industry and are highly desirable as spatial light modulators because of their polarisation independence and fast switching. However, these types of devices suffer from multistep fabrication conditions and require high threshold voltages. To overcome these limitations, two key points were considered: High flexoelectric liquid crystals are capable of uniform 3D self-assembly, with a wide temperature range but have high threshold voltages, whereas, other classes of high di
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Wright, Laura Jayne. "Quantum pulse shaping by direct temporal phase modulation." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:1ea55458-62be-461d-a92e-1aa360995129.

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Creating and controlling well-defined single-photon states is important for many quantum enhanced technologies. Information can be encoded in any degree of freedom associated with a single-photon field excitation, for example in the polarization or transverse spatial mode structure. The ability to encode multiple qubits in these states is desirable for high data transmission rates and increased information processing capacity. The spectral-temporal domain offers a large Hilbert space for encoding information, well suited to integrated optical architectures owing to the low cross-talk between c
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45

Schoonees, Johann August. "A likelihood ratio analysis of digital phase modulation." Doctoral thesis, University of Cape Town, 1998. http://hdl.handle.net/11427/19508.

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Bibliography: p. 180-188.<br>Although the likelihood ratio forms the theoretical basis for maximum likelihood (ML) detection in coherent digital communication systems, it has not been applied directly to the problem of designing good trellis-coded modulation (TOM) schemes. The remarkably simple optimal receiver of minimum shift keying (MSK) has been shown to result from the mathematical simplification of its likelihood ratio into a single term. The log-likelihood ratio then becomes a linear sum of metrics which can be implemented as a so-called simplified receiver, comprising only a few adders
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Ghareeb, Ibrahim. "Hybrid frequency-phase modulation: Performance analysis and applications." Thesis, University of Ottawa (Canada), 1995. http://hdl.handle.net/10393/10290.

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This thesis studies the performance of joint frequency-phase modulation (JFPM) communication systems, it considers its spread spectrum as well as narrow band applications. JFPM signal has been mathematically modeled. Its power spectral density and bandwidth efficiency have been analyzed. A bit error rate performance of JFPM signals in AWGN as well as in Rayleigh fading channels is obtained. Assuming statistical independence of the diversity channels, we have analyzed the diversity combining reception of JFPM over Rayleigh fading channels. These analytical results show that, JFPM signals are ch
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Mengoni, Michele <1981&gt. "Modulation Techniques for Multi-Phase Converters and Control Strategies for Multi-Phase Electric Drives." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2309/.

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The ever-increasing spread of automation in industry puts the electrical engineer in a central role as a promoter of technological development in a sector such as the use of electricity, which is the basis of all the machinery and productive processes. Moreover the spread of drives for motor control and static converters with structures ever more complex, places the electrical engineer to face new challenges whose solution has as critical elements in the implementation of digital control techniques with the requirements of inexpensiveness and efficiency of the final product. The successfully
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48

Detwiler, Thomas Frederick. "Continuous phase modulation for high speed fiber-optic links." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42867.

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Fiber-optic networks are continually evolving to accommodate the ever increasing data rates demanded by modern applications and devices. The current state-of-the art systems are being deployed with 100 Gb/s rates per wavelength while maintaining the 50 GHz channel spacing established for 10 Gb/s dense wavelength division multiplexed (DWDM) systems. Phase modulation formats (in particular quadrature phase shift keying - QPSK) are necessary to meet the spectral efficiency (SE) requirements of the application. The main challenge for phase modulated optical systems is fiber nonlinearities, where c
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49

Ramaswamy, Prasanna. "Simulation of Traveling Wave Electroabsorption Modulators for Phase Modulation." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-101211.

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Electro-Absorption Modulators (EAMs) have been instrumental in achieving ultrafast modulation speeds of over 100 Gb/s, and in particular, segmented Travelling-Wave (TWEAMs) designs offer excellent compatibility with standardmicrowave technology due to their characteristic impedance being closer to 50. The TWEAM device fabricated as part of the European Project HECTO, has been succesful is field trials at 112 Gb/s using On-Off Keying (OOK). Achieving phase modulation using a TWEAM offers not only significant improvements over OOK in terms of higher bit rate, but also a great advantage against o
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50

Xu, Xian. "Enabling technologies for direct detection optical phase modulation formats." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=86993.

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Phase modulation formats are believed to be one of the key enabling techniques for next generation high speed long haul fiber-optic communication systems due to the following main advantages: (1) with a balanced detection, a better receiver sensitivity over conventional intensity modulation formats, e.g., a ~3 dB sensitivity improvement using differential phase shift keying (DPSK) and a ~1.3 dB sensitivity improvement using differential quadrature phase shift keying (DQPSK); (2) excellent robustness against fiber nonlinearities; (3) high spectrum efficiency when using multilevel phase modulati
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