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Dissertations / Theses on the topic 'Radio relay system'

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Published: 30 May 2022

Last updated: 31 July 2025

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1

Tidwell, Steve Chase 1957. "DESIGN OF A 5X AFOCAL RELAY LENS FOR A HETERODYNE SYSTEM (LASER)." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/291288.

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2

St, Germain Kenneth W. "Shipboard radio frequency and free space optics communications system using an airborne relay." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Sep%5FStGermain.pdf.

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3

Soelaiman, Adi Dharma, and Rina Pudjiastuti. "A Survays On Fading Channel Over West - Java Area for Flight Test Radio Telemetering Purposes." International Foundation for Telemetering, 1988. http://hdl.handle.net/10150/615047.

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International Telemetering Conference Proceedings / October 17-20, 1988 / Riviera Hotel, Las Vegas, Nevada<br>This paper discusses one approach to determine a characteristic of West - Java's air and ground segment as a block-box to accomodate radio waves propagation, especially in L-band ranges, by evaluating both the topographical data and radio reception pattern as measured from ground based telemetry receiving-end system. All the measured signals are random and assumed to be stationair and ergodic. In order to characterize the channel for polarization diversity reception, some statistical a

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4

Çelebi, Mehmet Bahadır. "On the Improvement of the Capacity of the Heterogeneous Networks with Link-Level and System-Level Approaches." Scholar Commons, 2014. https://scholarcommons.usf.edu/etd/5353.

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Evolution of wireless services enabled the development of the advanced applications and shifted the paradigms of research in this field from voice to data centric. Such services are spreading like wildfire between users and hence, increasing the demand for large bandwidth. However, the frequency spectrum that is suitable for wireless mobile communications is already assigned to particular services from 400 MHz to several GHz. Also, allocating a large chunk of band continuously from the same part of the spectrum may not be possible due to spectral crowd. Therefore, meeting the demand for high d

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5

Russell, Thomas A. "Predicting microwave diffraction in the shadows of buildings." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-10222009-125156/.

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6

Dai, Gao Yang. "A novel soft forwarding technique for cooperative communication /." View abstract or full-text, 2010. http://library.ust.hk/cgi/db/thesis.pl?ECED%202010%20DAI.

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7

Alotaibi, Faisal T. "Distributed space-time block coding in cooperative relay networks with application in cognitive radio." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/10965.

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Spatial diversity is an effective technique to combat the effects of severe fading in wireless environments. Recently, cooperative communications has emerged as an attractive communications paradigm that can introduce a new form of spatial diversity which is known as cooperative diversity, that can enhance system reliability without sacrificing the scarce bandwidth resource or consuming more transmit power. It enables single-antenna terminals in a wireless relay network to share their antennas to form a virtual antenna array on the basis of their distributed locations. As such, the same divers

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8

Advaita, Advaita, and Mani Meghala Gali. "Performance Analysis of a MIMO Cognitive Cooperative Radio Network with Multiple AF Relays." Thesis, Blekinge Tekniska Högskola, Institutionen för tillämpad signalbehandling, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-13643.

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With the rapid growth of wireless communications, the demand for the various multimedia services is increasing day by day leading to a deficit in the frequency spectrum resources. To overcome this problem, the concept of cognitive radio technology has been proposed which allows the unlicensed secondary user (SU) to access the licensed spectrum of the primary user (PU), thus improving the spectrum utilization. Cooperative communications is another emerging technology which is capable of overcoming many limitations in wireless systems by increasing reliability and coverage. The transmit and rece

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9

Chami, Marwa. "Optimization in cognitive radio systems with successive interference cancellation and relaying." Thesis, Paris, CNAM, 2016. http://www.theses.fr/2016CNAM1050.

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La Radio Cognitive (CR) est une technique prometteuse pour assurer une utilisation efficace du spectre. Elle permet à un utilisateur non licencié appelé utilisateur secondaire (SU) de coexister avec un utilisateur agréé appelé utilisateur primaire (PU) sans dégrader les performances du dernier. Dans un système de CR, le SU a la capacité de s'adapter à son environnement afin de détecter des trous de fréquences possibles dans le spectre et transmettre dans ces trous sous certaines contraintes de manière à augmenter le débit total. Par ailleurs, l'allocation des ressources dans les systèmes CR fo

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10

Chami, Marwa. "Optimization in cognitive radio systems with successive interference cancellation and relaying." Electronic Thesis or Diss., Paris, CNAM, 2016. http://www.theses.fr/2016CNAM1050.

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La Radio Cognitive (CR) est une technique prometteuse pour assurer une utilisation efficace du spectre. Elle permet à un utilisateur non licencié appelé utilisateur secondaire (SU) de coexister avec un utilisateur agréé appelé utilisateur primaire (PU) sans dégrader les performances du dernier. Dans un système de CR, le SU a la capacité de s'adapter à son environnement afin de détecter des trous de fréquences possibles dans le spectre et transmettre dans ces trous sous certaines contraintes de manière à augmenter le débit total. Par ailleurs, l'allocation des ressources dans les systèmes CR fo

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11

Шестопал, Євген Олександрович, Евгений Александрович Шестопал та Yevgen Shestopal. "Методи покращення енергетичної ефективності та скритності цифрових радіорелейних систем передачі". Thesis, Національний авіаційний університет, 2021. https://er.nau.edu.ua/handle/NAU/52213.

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У дисертаційній роботі вирішена актуальна науково-технічна задача, яка полягає в новому комплексному підході до забезпечення мінімальної потужності передавача, достатньої для одержання заданої ймовірності помилки приймання сигналу, та покращеної скритності передачі інформації. Проведені дослідження впливу виду модуляції сигналу на потужність передавача радіорелейної станції. Показано, що найкращі результати досягаються при використанні 4-х позиційного фазоманіпульованого сигналу ФМ-4. При даній смузі пропускання радіоканалу пропонується використати амплітудно-маніпульований сигнал з під

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12

Azarian, Yazdi Kambiz. "Outage limited cooperative channels protocols and analysis /." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1154740723.

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13

Xing, Chengwen, and 邢成文. "Linear minimum mean-square-error transceiver design for amplify-and-forward multiple antenna relaying systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B44769738.

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14

Bouallegue, Seifeddine. "Mobility and Security Management in Femtocell Networks." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066084/document.

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Les réseaux de télécommunications sont soumis à des processus d'amélioration et d'optimisation continue. Chaque nouvelle itération apporte son lot de défis et limites. En effet, la croissance exponentielle des appareils de télécommunication, des stations de base aux équipements utilisateurs conduisent à de sérieux problèmes d'economie d'énergie. En plus des menaces à la vie privée, en particulier pour les réseaux sans fil car les canaux utilisés par les opérateurs peuvent également être utilisés par une oreille indiscrète quelconque. L'optimisation de l'utilisation du spectre est également un

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15

Bouallegue, Seifeddine. "Mobility and Security Management in Femtocell Networks." Electronic Thesis or Diss., Paris 6, 2016. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2016PA066084.pdf.

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Les réseaux de télécommunications sont soumis à des processus d'amélioration et d'optimisation continue. Chaque nouvelle itération apporte son lot de défis et limites. En effet, la croissance exponentielle des appareils de télécommunication, des stations de base aux équipements utilisateurs conduisent à de sérieux problèmes d'economie d'énergie. En plus des menaces à la vie privée, en particulier pour les réseaux sans fil car les canaux utilisés par les opérateurs peuvent également être utilisés par une oreille indiscrète quelconque. L'optimisation de l'utilisation du spectre est également un

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16

Alves, Hirley. "On the performance analysis of full-duplex networks." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1253.

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Nesta tese estudamos redes cooperativas em modo de operação Full-Duplex (FD). Para tanto, usamos conceitos de teoria da informação e da comunicação, além de estatística aplicada. Assim, fornecemos uma extensa análise de desempenho de sistemas cooperativos em modo FD. Além disso, demonstramos que a operação de relays em modo FD é possível, mesmo sofrendo intensos níveis de auto-interferência. Mostramos também sua aplicação em diversos cenários. Ademais, os resultados obtidos através deste trabalho servem como referência para o design e desenvolvimento de futuras tecnologias de comunicação sem-f

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17

Cardone, Martina. "Techniques de coopération appliquées aux futurs réseaux cellulaires." Electronic Thesis or Diss., Paris, ENST, 2015. http://www.theses.fr/2015ENST0020.

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Une qualité de service uniforme pour les utilisateurs mobiles et une utilisation distribuée du spectre représentent les ingrédients clés des réseaux cellulaires de prochaine génération. Dans ce but, la coopération au niveau de la couche physique entre les nœuds de l’infrastructure et les nœuds du réseau sans fil a émergé comme une technique à fort potentiel. La coopération s’appuie sur les propriétés de diffusion du canal sans fil, c’est-à-dire que la même transmission peut être entendue par plusieurs nœuds, ouvrant ainsi la possibilité pour les nœuds de s’aider à transmettre les messages à le

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18

Cardone, Martina. "Techniques de coopération appliquées aux futurs réseaux cellulaires." Thesis, Paris, ENST, 2015. http://www.theses.fr/2015ENST0020/document.

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Une qualité de service uniforme pour les utilisateurs mobiles et une utilisation distribuée du spectre représentent les ingrédients clés des réseaux cellulaires de prochaine génération. Dans ce but, la coopération au niveau de la couche physique entre les nœuds de l’infrastructure et les nœuds du réseau sans fil a émergé comme une technique à fort potentiel. La coopération s’appuie sur les propriétés de diffusion du canal sans fil, c’est-à-dire que la même transmission peut être entendue par plusieurs nœuds, ouvrant ainsi la possibilité pour les nœuds de s’aider à transmettre les messages à le

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19

Gerbracht, Sabrina, Eduard A. Jorswieck, Gan Zheng, and Björn Ottersten. "Non-regenerative Two-Hop Wiretap Channels using Interference Neutralization." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-113245.

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In this paper, we analyze the achievable secrecy rates in the two-hop wiretap channel with four nodes, where the transmitter and the receiver have multiple antennas while the relay and the eavesdropper have only a single antenna each. The relay is operating in amplify-and-forward mode and all the channels between the nodes are known perfectly by the transmitter. We discuss different transmission and protection schemes like artificial noise (AN). Furthermore, we introduce interference neutralization (IN) as a new protection scheme. We compare the different schemes regarding the high-SNR slope a

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20

Gerbracht, Sabrina, Eduard A. Jorswieck, Gan Zheng, and Björn Ottersten. "Non-regenerative Two-Hop Wiretap Channels using Interference Neutralization." Technische Universität Dresden, 2012. https://tud.qucosa.de/id/qucosa%3A26894.

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In this paper, we analyze the achievable secrecy rates in the two-hop wiretap channel with four nodes, where the transmitter and the receiver have multiple antennas while the relay and the eavesdropper have only a single antenna each. The relay is operating in amplify-and-forward mode and all the channels between the nodes are known perfectly by the transmitter. We discuss different transmission and protection schemes like artificial noise (AN). Furthermore, we introduce interference neutralization (IN) as a new protection scheme. We compare the different schemes regarding the high-SNR slope a

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21

朱家弘. "Radio Resource Management for Mobile Multihop Relay(MMR) in Mobile WiMAX System." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/96303384716464637895.

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碩士<br>國立交通大學<br>電機學院微電子奈米科技產業專班<br>97<br>The mobile WiMAX which provide high speed transmission over large area has been adopted as one of the candidates of next generation communication system. But, with higher demand of multi-media application, not only high date rate and high bandwidth is necessary for wireless transmission, but also to consider whole cell average throughput, and coverage extension. Consequently, the Mobile Multihop Relay (MMR) system will be the solutions of future wireless system. Base on those idea the Mobile Multihop Relay (MMR) system were establish in IEEE 802.16j. I

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22

Lai, Xi-Song, and 賴溪松. "Tandem and route diversity system design on 20GHz band radio relay links in Taiwan." Thesis, 1986. http://ndltd.ncl.edu.tw/handle/41316677086828795565.

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23

Sainath, B. "Optimal Amplify-And-Forward Relaying For Cooperative Communications And Underlay Cognitive Radio." Thesis, 2015. https://etd.iisc.ac.in/handle/2005/2650.

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Relay-assisted cooperative communication exploits spatial diversity to combat wireless fading, and is an appealing technology for next generation wireless systems. Several relay cooperation protocols have been proposed in the literature. In amplify-and-forward (AF)relaying, which is the focus of this thesis, the relay amplifies the signal it receives from the source and forwards it to the destination. AF has been extensively studied in the literature on account of its simplicity since the relay does not need to decode the received signal. We propose a novel optimal relaying policy for two-ho

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Sainath, B. "Optimal Amplify-And-Forward Relaying For Cooperative Communications And Underlay Cognitive Radio." Thesis, 2015. http://etd.iisc.ernet.in/handle/2005/2650.

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Relay-assisted cooperative communication exploits spatial diversity to combat wireless fading, and is an appealing technology for next generation wireless systems. Several relay cooperation protocols have been proposed in the literature. In amplify-and-forward (AF)relaying, which is the focus of this thesis, the relay amplifies the signal it receives from the source and forwards it to the destination. AF has been extensively studied in the literature on account of its simplicity since the relay does not need to decode the received signal. We propose a novel optimal relaying policy for two-hop

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25

Surobhi, Nusrat Ahmed. "Outage performance of cooperative cognitive relay networks." 2009. http://eprints.vu.edu.au/15509.

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26

Lo, Caleb K. 1981. "Relay-assisted communication : fundamental limits and selection strategies." 2008. http://hdl.handle.net/2152/18163.

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Wireless communication continues to make a profound impact upon our daily lives. The oft-touted benefits of high data rates and improved reliability via wireless communication are limited by its inherent drawbacks, including path loss, fading and interference. One promising strategy for overcoming these problems is to deploy nodes in the region between a transmitter and its intended receiver. These intermediate nodes can improve communication for this transmitter-receiver pair by receiving a transmitted message, processing it and relaying the processed output to the receiver. This transmission

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27

謝政霖. "Max-Min SINR Based Power Control in Cognitive Radio and Relay Systems." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/86258766780092676260.

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Surobhi, Nusrat Ahmed. "Outage performance of cooperative cognitive relay networks." Thesis, 2009. https://vuir.vu.edu.au/15509/.

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This thesis considers the incorporation of cooperative relays into a cognitive radio network. Cognitive radio is a potential solution to the growing scarcity of radio spectrum and the increased demand for wireless services. Cooperative relay networks can help cognitive radios to improve their utilisation by reducing their transmit power. This allows a reduction in their interference footprint and increases their probability of accessing licensed spectrum, improving throughput, and/or coverage. A cognitive relay network model has been analysed to derive the closed-form outage probability expr

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29

Luo, C., Geyong Min, F. R. Yu, M. Chen, L. T. Yang, and V. C. M. Leung. "Energy-Efficient Distributed Relay and Power Control in Cognitive Radio Cooperative Communications." Thesis, 2013. http://hdl.handle.net/10454/9684.

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no<br>In cognitive radio cooperative communication (CR-CC) systems, the achievable data rate can be improved by increasing the transmission power. However, the increase in power consumption may cause the interference with primary users and reduce the network lifetime. Most previous work on CR-CC did not take into account the tradeoff between the achievable data rate and network lifetime. To fill this gap, this paper proposes an energy-efficient joint relay selection and power allocation scheme in which the state of a relay is characterized by the channel condition of all related links and its

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30

Tang, Taiwen. "Multiple antenna downlink: feedback reduction, interference suppression and relay transmission." Thesis, 2006. http://hdl.handle.net/2152/2970.

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31

Whang, Roderick Jaehoon. "Efficient multiuser cooperative relay communications employing layered modulations." Thesis, 2011. http://hdl.handle.net/1957/23653.

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Relay-assisted cooperative communications are promising solutions for error-performance improvement and cell coverage extension. In this thesis, we propose several efficient cooperative relay communication schemes. First, an efficient space-time coded cooperative relay communications scheme that employs linear precoding and transmission-pattern selection is proposed. This is built upon an existing block linear precoding technique for conventional multiple-input multiple-output systems in order to improve the diversity performance of a multihop relay network. Second, we consider several multius

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32

"Signal detection and equalization in cooperative communication systems having multiple carrier frequency offsets." Thesis, 2009. http://library.cuhk.edu.hk/record=b6074753.

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Different from multiple-input multiple-output (MIMO) systems, a major challenge for cooperative communications is the problem of synchronization because multiple transmissions undertaken by cooperative systems may not be synchronized in time and/or frequency. With synchronization errors, conventional space-time (ST) codes may not be directly applicable any longer. To tackle the problem of timing synchronization, space-frequency (SF) coded orthogonal frequency division multiplexing (OFDM) cooperative systems have recently been proposed to achieve asynchronous diversity due to their insensitivit

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33

Khan, Fahd Ahmed. "Analytical Frameworks of Cooperative and Cognitive Radio Systems with Practical Considerations." Diss., 2013. http://hdl.handle.net/10754/301464.

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Cooperative and cognitive radio systems have been proposed as a solution to improve the quality-of-service (QoS) and spectrum efficiency of existing communication systems. The objective of this dissertation is to propose and analyze schemes for cooperative and cognitive radio systems considering real world scenarios and to make these technologies implementable. In most of the research on cooperative relaying, it has been assumed that the communicating nodes have perfect channel state information (CSI). However, in reality, this is not the case and the nodes may only have an estimate of the CS

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34

Lo, Shih-An, and 羅仕安. "Design and Implementation of Full-Duplex Decode-and-Forward Relay Systems Utilizing Software-Defined Radio." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/aemw52.

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碩士<br>國立中央大學<br>通訊工程學系<br>107<br>Due to the capability of transmitting and receiving signals at the same time on the same frequency band, full-duplex communication systems can theoretically double the spectral efficiency, as compared with the conventional half-duplex systems. However, the performance of a full-duplex transceiver is limited by the inherent self-interference. Thus, how to overcome the self-interference problem becomes a challenging issue in successfully realizing the full-duplex communication systems. In this thesis, we first present the mathematical system models for full-duple

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Chen, Su-Hua, and 陳思樺. "Multiuser MIMO Precoding Technology Design with Interference Cancellation and Enhanced Diversity Gain for Cognitive Radio Relay Systems." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/73700563748752004768.

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碩士<br>元智大學<br>通訊工程學系<br>104<br>The thesis studies the benefit of relay station. Multiuser MIMO Cognitive Radio (CR) system is the popular research topic. Moreover, in the overlay system with the unlicensed CR users (CU) and the licensed primary users (PU), PU performance will be degraded by interferences. Similarly, CU transmission efficiency will be reduced by PU interferences. For the traditional multiuser MIMO system, the precoding schemes are utilized to limit the CU transmission power, which can reach the no interference to PU. However, the PU signal will induce the interference to CU. In

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Benkhelifa, Fatma. "Towards Perpetual Energy Operation in Wireless Communication Systems." Diss., 2017. http://hdl.handle.net/10754/626219.

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Wireless is everywhere. Smartphones, tablets, laptops, implantable medical devices, and many other wireless devices are massively taking part of our everyday activities. On average, an actively digital consumer has three devices. However, most of these wireless devices are small equipped with batteries that are often limited and need to be replaced or recharged. This fact limits the operating lifetime of wireless devices and presents a major challenge in wireless communication. To improve the perpetual energy operation of wireless communication systems, energy harvesting (EH) from the radio fr

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Ansari, Imran Shafique. "On the Performance of Free-Space Optical Systems over Generalized Atmospheric Turbulence Channels with Pointing Errors." Diss., 2015. http://hdl.handle.net/10754/346311.

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Generalized fading has been an imminent part and parcel of wireless communications. It not only characterizes the wireless channel appropriately but also allows its utilization for further performance analysis of various types of wireless communication systems. Under the umbrella of generalized fading channels, a unified performance analysis of a free-space optical (FSO) link over the Malaga (M) atmospheric turbulence channel that accounts for pointing errors and both types of detection techniques (i.e. indirect modulation/direct detection (IM/DD) as well as heterodyne detection) is presented.

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38

Zaid, Adem Mabruk. "Enhancing macrocell downlink performance through femtocell user cooperation." Thesis, 2011. http://hdl.handle.net/1957/25930.

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This thesis studies cooperative techniques that rely on femtocell user diversity to improve the downlink communication quality of macrocell users. We analytically analyze and evaluate the achievable performance of these techniques in the downlink of Rayleigh fading channels. We provide an approximation of both the bit-error rate (BER) and the data throughput that macrocell users receive with femtocell user cooperation. Using simulations, we show that under reasonable SNR values, cooperative schemes enhance the performances of macrocells by improving the BER, outage probability, and data throug

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