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Rozprawy doktorskie na temat „Ultra wide band optical systems”

Autor: Grafiati

Data publikacji: 5 października 2024

Data aktualizacji: 31 lipca 2025

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1

Escobar, landero Salma. "Ultra-wideband coherent optical transmission systems : from modeling and optimization to experimental demonstrations beyond 100 Tbit/s." Electronic Thesis or Diss., Institut polytechnique de Paris, 2024. http://www.theses.fr/2024IPPAS012.

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Les systèmes ultra-large bande(UWB) sont considérés comme une stratégie rentable pour augmenter le débit par fibre dans les communications optiques en repoussant les limites de la bande passante opérationnelle au-delà de la bande C. Des expériences récente sont présenté des résultats prometteurs avec des transmissions à haute capacité UWB fonctionnant à travers les bandes S+C+L, et même au-delà. Ces avancées soulèvent la question des avoir si cette technologie peut être efficacement mise à l'échelle pour répondre aux demandes croissantes de trafic de données. Cette thèse fournit une étude appr

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Guidi, Francesco. "Study of Ultra Wide Band Modulated Backscattering Based RFID Systems." Palaiseau, Ecole polytechnique, 2013. http://pastel.archives-ouvertes.fr/pastel-00848627.

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Depuis quelques années le nouveau paradigme d'internet des objets, qui se traduit par la connexion des objets de la vie quotidienne à internet grâce à des dispositifs électroniques intégrés, est devenu plus qu'un simple concept et a commencé à entrer dans la réalité. Il en est ainsi des systèmes d'identification par radiofréquence (RFID), qui font partie des technologies disponibles. Lorsque le coût et la taille des tags deviennent des exigences prépondérantes, l'adoption de tags (semi-)passifs fondés sur la modulation d'un signal rétrodiffusé représente une solution attractive. En outre, l'ut

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3

Berksoy, Burak. "ULTRA-WIDE BAND IN COMMUNICATIONS: PERFORMANCE ANALYSIS AND ENHANCEMENTS." Doctoral diss., Orlando, Fla. : University of Central Florida, 2008. http://purl.fcla.edu/fcla/etd/CFE0002106.

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Toycan, Mehmet. "Next generation optical access networks and wireless integration featuring ultra-wide-band technology." Thesis, University of Essex, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.510509.

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Jin, Ruofan. "Cognitive power allocation for multicarrier based ultra wide band (UWB) wireless systems." Thesis, University of York, 2012. http://etheses.whiterose.ac.uk/3306/.

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This thesis presents a study of Distributed Cognitive Power Allocation for multicarrier based Ultra Wide Band (UWB) wireless systems in a point to point configuration as a way of reducing the coexistence interference for low power emission wireless systems in close proximity, as well as combating the increased path loss and fading at longer range by means of a Distributed Cognitive Power Allocation (DCPA) scheme. The Multiband Orthogonal Frequency Division Multiplexing (MB-OFDM) standard for Ultra Wide Band (UWB) wireless data communication is used as the basis in this research. A novel gradie

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6

Fallah, Hamid Reza. "Aberration calculation and design methods for ultra wide-angle and panoramic optical systems." Thesis, Imperial College London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266272.

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Tauqeer, Tauseef. "Low Power, High Speed InP-Based Digital Intergrated Circuits for Ultra Wide Band Communicatiopn Systems." Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.508526.

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Javashvili, Otar. "UWB Antennas for Wall Penetrating Radar Systems." Thesis, University of Gävle, University of Gävle, University of Gävle, Center for RF Measurement Technologies, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-5509.

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<p>Basic properties and new design principles of ultra wideband Vivaldi antennas are presentedand discussed in this paper. The focus will be on the modeling of Vivaldi antenna design curves, by which it is constructed; its simulation results, realization and the measurements.</p><p>According to the aim of this research the discussion starts with the review of the previous researches done for Vivaldi antennas. Introductory part of the report also contains the problem description for the current project and the classification of the goals to be achieved. As a theoretical review, the discussion i

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Al-baidhani, Abbas. "Self-deployable positioning systems for emergency situations employing uwb radio technology." Doctoral thesis, Universitat Autònoma de Barcelona, 2019. http://hdl.handle.net/10803/667752.

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Indoor positioning systems have been widely studied in the last decade due to the need of humans for them especially in the large building such as malls, airports, hospitals...etc. Still, there is no suitable precise indoor positioning system which can be implemented for different indoor environments and situations. We should mention military urban and emergency situations. In military urban and emergency response operations, the time is a crucial issue, and a precise positioning system with a clear indoor covering is a highly prerequisite tool to enhance safety. It should be seamless, low, fr

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STOPPA, MATTEO, Candido PIRRI, DANILO DEMARCHI, and Andrew David Green. "Smart Devices and Systems for Wearable Applications." Doctoral thesis, Politecnico di Torino, 2016. http://hdl.handle.net/11583/2646656.

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Wearable technologies need a smooth and unobtrusive integration of electronics and smart materials into textiles. The integration of sensors, actuators and computing technologies able to sense, react and adapt to external stimuli, is the expression of a new generation of wearable devices. The vision of wearable computing describes a system made by embedded, low power and wireless electronics coupled with smart and reliable sensors - as an integrated part of textile structure or directly in contact with the human body. Therefore, such system must maintain its sensing capabilities under the d

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11

Manekiya, Mohammedhusen Hanifbhai. "Microwave and RF system for Industrial and Biomedical Applications." Doctoral thesis, Università degli studi di Trento, 2021. http://hdl.handle.net/11572/306624.

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Modern smartphone technology has created a myriad of opportunities in the field of RF and Microwave. Specifically, Chipless RFID sensor, compact microwave filter, antenna based on a microstrip structure, and many more. In this thesis, innovative ideas for the industrial and biomedical device has been explored. The work presents the reconfigurable filter design, Switch-beam antenna, Microwave interferometer, X-band Rotman Lens antenna, Ultra-wideband antenna based on SIW resonator, L-band Stepped Frequency Continuous Wave antenna, development of a wireless sensor system for environmental monito

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Manekiya, Mohammedhusen Hanifbhai. "Microwave and RF system for Industrial and Biomedical Applications." Doctoral thesis, Università degli studi di Trento, 2021. http://hdl.handle.net/11572/306624.

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Modern smartphone technology has created a myriad of opportunities in the field of RF and Microwave. Specifically, Chipless RFID sensor, compact microwave filter, antenna based on a microstrip structure, and many more. In this thesis, innovative ideas for the industrial and biomedical device has been explored. The work presents the reconfigurable filter design, Switch-beam antenna, Microwave interferometer, X-band Rotman Lens antenna, Ultra-wideband antenna based on SIW resonator, L-band Stepped Frequency Continuous Wave antenna, development of a wireless sensor system for environmental monito

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13

Silva, Bruna Alice Lima da. "Antenas monopolo planar com patch em anel circular para sistemas UWB." Universidade Federal do Rio Grande do Norte, 2010. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15320.

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Made available in DSpace on 2014-12-17T14:55:43Z (GMT). No. of bitstreams: 1 BrunaALS_DISSERT.pdf: 4847936 bytes, checksum: ecc365df0d6ba32afff7d15a2ae1d14a (MD5) Previous issue date: 2010-06-14<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>The microstrip antennas are largely used in wireless communication systems due to their low cost, weight, less complex construction and manufacturing, in addition to its versatility. UWB systems have emerged as an alternative to wireless communications over short distances because they offer of higher capacity and lower multipath disto

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14

Persson, Anders. "Platform development of body area network for gait symmetry analysis using IMU and UWB technology." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-39498.

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Having a device with the capability of measure motions from gait produced by a human being, could be of most importance in medicine and sports. Physicians or researchers could measure and analyse key features of a person's gait for the purpose of rehabilitation or science, regarding neurological disabilities. Also in sports, professionals and hobbyists could use such a device for improving their technique or prevent injuries when performing. In this master thesis, I present the research of what technology is capable of today, regarding gait analysis devices. The research that was done has then

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15

Gracia, Christopher Anthony. "Ultra wide band antenna optimization /." 2008. http://proquest.umi.com/pqdweb?did=1619620241&sid=7&Fmt=2&clientId=10361&RQT=309&VName=PQD.

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16

Maciel, Rodrigo Silva. "Optical transmitter for ultra-wide band signals." Master's thesis, 2012. https://repositorio-aberto.up.pt/handle/10216/65309.

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Maciel, Rodrigo Silva. "Optical transmitter for ultra-wide band signals." Dissertação, 2012. https://repositorio-aberto.up.pt/handle/10216/65309.

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18

Chou, Yi-fen, and 周怡芬. "Optical Ultra-Wide-Band Pulse generation by QuantumWell-Waveguide device." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/38445341624038719418.

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碩士<br>國立中山大學<br>光電工程研究所<br>96<br>Ultra Wide Band (UWB) is a short-pulse electrical signal, which is widely used for short distant wireless communication due to its low path loss, good immunity to multipath propagation, and high data rate. The main target transmission area of UWB is within 10 meters. Using optical fiber as carrier can bust up the communication capacitance in long distance range because of high capacitance, low loss propagation, and TDM and WDM compatible properties of fiber. Thereby, the technique of UWB on fiber has become more and more important. In this work, a novel method

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19

Tsao, Po-Yao, and 曹博堯. "Design of Cooperative Communication in Ultra Wide Band Systems." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/35852583364555355561.

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碩士<br>國立中央大學<br>電機工程研究所<br>99<br>Ultra-wide band (UWB) has huge amount of bandwidth and thus is highly potential in giga-bit data rate transmission. However, to avoid conflict with other existing standard in the same spectrum, UWB’ emit power is restricted under a very low level (almost noise level compare to 802.11n). So the noise problem would be the key point of UWB transceiver design and thus is the main issue of this thesis. To solve this problem, we apply cooperative communication into UWB to form a multi device communication system. The basic idea of cooperative communication is to shar

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20

Lin, Yu Yi, and 林祐逸. "Bidirectional Multi-carrier Ultra-Wide Band for Radio-over-Fiber Communication Systems." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/20955708546497926112.

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碩士<br>長庚大學<br>電機工程學研究所<br>97<br>The wireless high speed transmission won’t satisfy the customer due to the bottleneck of the high-frequency wireless technology. This study focuses on design of an optical ultra-wideband (UWB) pulse train with on-off keying (OOK) modulation scheme for bidirectional multi-carrier radio-over-fiber (ROF) communication systems. The mathematic modeling of multi-carrier UWB system is setup to evaluate the performance of Gaussian-like subcarriers. The generated optical Gaussian-like pulses can provide the several GHz bandwidths and improve the fiber dispersion and inte

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21

Ho, Min-Hui, and 賀敏慧. "Ultra-Wide Band Communication Systems for Indoor Environments by Applying Optimization Methods." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/17044758797628538170.

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博士<br>淡江大學<br>電機工程學系博士班<br>101<br>The genetic algorithm （GA）, particle swarm optimization （PSO）, asynchronous particle swarm optimization （APSO） and dynamic differential evolution （DDE） are used to optimizing the objective functions (criterion for measuring the effectiveness of the obtained optimized algorithm solution) and solved in indoor ultra-wide band （UWB） communication system. First, the optimal locations of the transmitter antenna for maximum received power in large area (>10m) UWB wireless communication systems with a mobile transmitter and uniformly distributed receivers are evaluate

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Chien, Hsin Hui, and 簡昕慧. "Orthogonal Multi-carrier Ultra-Wide Band for Radio-over-Fiber Communication Systems." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/34918783784871573129.

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碩士<br>長庚大學<br>電機工程研究所<br>95<br>This study focuses on wireless multi-band ultra-wideband (MB-UWB) with orthogonal frequency division multiplexing (OFDM) technology for radio-over-fiber communication systems. This system can provide a high -peed data rate under wireless transmission. In general UWB wireless systems generate output pulses with electronic structure. But the electronic structure is not easy to generate so narrow pulses. However, the optical signal can provide a greatly wide bandwidth, the UWB pulses are easier to generate by the optical devices than to generate by the electronic de

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23

Huang, Chun-Yuan, and 黃俊淵. "Circuit Design of Baseband Transceiver for Direct Sequence Ultra-Wide Band Systems." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/magjtc.

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碩士<br>國立中山大學<br>通訊工程研究所<br>97<br>A circuit design of baseband transceiver for direct sequence ultra-wide band system is presented in this thesis. A low complexity Viterbi decoder is also proposed. This Viterbi decoder circuit is based on compare-select-add unit and trace-forward architecture. The decision bit operator is reduced to one adder and this can lower down the hardware complexity. Further, two trace-forward operators are used in the survivor management unit. Only two single port SRAM’s with a length of T are applied for reducing the area of memory. The chip is implemented by TSMC

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Li, Heng Te, and 李恆德. "The Study of Multi-Band Orthogonal Frequency Division Multiplexing Ultra Wide Band-over-Fiber Communication Systems." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/56626667405455231140.

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碩士<br>長庚大學<br>電機工程學研究所<br>97<br>The requirement of transmission data rates is more increasing for wireless communication system in recent years. The Ultra-wideband (UWB) communication technique and system owned the large bandwidth can utilized, high transmission rates and low power consumption, it being the center of attraction for new age wireless communication technique. In this thesis, we utilize the MB-OFDM UWB modulation technique on fiber communication system. This system architecture composed of the MB-OFDM UWB signal modulation development module, distributed feedback (DFB) laser, elec

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Huang, Chu-chi, and 黃竹棋. "A Study on Timing Acquisition and Channel Estimation in Ultra-Wide Band Systems." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/m98y3h.

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碩士<br>國立中山大學<br>通訊工程研究所<br>96<br>The direct sequence ultra-wideband (DS-UWB) system has the characteristics of low transmission power constraints and wide transmitted bandwidth. The wide bandwidth will introduce fine timing resolution and severe inter-symbol interference (ISI), which will is cause larger delay spread. Therefore, the traditional acquisition methods are no longer suitable here. A modified acquisition method and a coarse channel estimation algorithm are proposed in this thesis. Three different strategies with composition of acquisition and channel estimation are compared. Based o

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Li, Yanyan. "Stochastic Modeling and Estimation of Wireless Channels with Application to Ultra Wide Band Systems." 2008. http://trace.tennessee.edu/utk_graddiss/567.

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This thesis is concerned with modeling of both space and time variations of Ultra Wide Band (UWB) indoor channels. The most common empirically determined amplitude distribution in many UWB environments is Nakagami distribution. The latter is generalized to stochastic diffusion processes which capture the dynamics of UWB channels. In contrast with the traditional models, the statistics of the proposed models are shown to be time varying, but converge in steady state to their static counterparts. System identification algorithms are used to extract various channel parameters using received signa

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Liu, Chun-Liang, and 劉俊良. "A Study of Channel Capacity of Multiple-Input Multiple-Output Ultra-Wide Band Systems." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/23373020900274313937.

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博士<br>淡江大學<br>電機工程學系博士班<br>97<br>This dissertation focuses on the research of channel capacity of multiple-input multiple-output ultra-wide band (UWB) systems. On the one hand UWB systems possess a nature of high channel capacity, and on the other hand multiple-input multiple-out (MIMO) approach can be used to enhance channel capacity effectively. Thus, it is expectable that UWB systems can be combined with multiple-input multiple-output approach to fulfill the necessity of high transmission rate in the future. It is well-known that UWB systems combining multiple-input multiple-out approach ca

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Chang, Wei-Chieh, and 張瑋婕. "Design of the CMOS Voltage-Controlled Ring Oscillator with Third Harmonic Cancellation for Low-Band Ultra-Wide Band Systems." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/95131603825576053650.

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碩士<br>中原大學<br>電子工程研究所<br>95<br>This thesis presents a Voltage-Controlled Ring Oscillator (VCO) with third-order harmonic cancellation technique for low-band Ultra-Wideband (UWB) system. The VCO consists of three-stage delay cells and an adder load. Use the adder to add the two output signals that have phase delay 60 degrees from ring-oscillator. Then that can effective to make oscillator output signal third harmonic suppress ratio lower than -40dBc. In order to produce the more pure output signal and make it while inputting to Polyphase Filter it is phase error exported can drop by a wide mar

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Prasad, Yogeshwar. "Studies of "clean" and "disordered" Bilayer Optical Lattice Systems Circumventing the 'fermionic Cooling-problem'." Thesis, 2018. http://etd.iisc.ac.in/handle/2005/4030.

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The advancement in the eld of cold-atoms has generated a lot of interest in the condensed matter community. Cold-atom experiments can simulate clean, disor-der/impurity free systems very easily. In these systems, we have a control over various parameters like tuning the interaction between particles by the Feshbach resonance, tuning the hopping between lattice sites by laser intensity and so on. As a result, these systems can be used to mimic various theoretical models, which was hindered because of various experimental limitations. Thus, we have an ex-perimental tool in which we can start wit

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Prasad, Yogeshwar. "Studies of "clean" and "disordered" Bilayer Optical Lattice Systems Circumventing the 'fermionic Cooling-problem'." Thesis, 2018. http://etd.iisc.ernet.in/2005/4003.

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The advancement in the eld of cold-atoms has generated a lot of interest in the condensed matter community. Cold-atom experiments can simulate clean, disor-der/impurity free systems very easily. In these systems, we have a control over various parameters like tuning the interaction between particles by the Feshbach resonance, tuning the hopping between lattice sites by laser intensity and so on. As a result, these systems can be used to mimic various theoretical models, which was hindered because of various experimental limitations. Thus, we have an ex-perimental tool in which we can start wit

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31

Robin, Ivan-Christophe. "Solid State Material Systems for Light Emission and Light Detection." Habilitation à diriger des recherches, 2011. http://tel.archives-ouvertes.fr/tel-00607740.

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A large variety of material systems for light emission and detection were studied: from very small band gap semiconductors for infra-red (IR) detectors to wide band gap semiconductors for ultra violet (UV) emission as well as CdSe/ZnSe QDs for single photon emitters and rare earth doped oxides for laser fabrication. The growth and characterization aspects were tackled. This work will focus on the relations between the growth procedures and the optical properties. The information that can be gained from optical studies as well as the limitations of those ones will be explained in each case. Fol

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