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Tesi sul tema "Cooperative diversity"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 25 luglio 2025

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1

Guerrero, Laura Yadira. "Cooperative diversity for distributed multicarrier relaying systems." Thesis, King's College London (University of London), 2017. https://kclpure.kcl.ac.uk/portal/en/theses/cooperative-diversity-for-distributed-multicarrier-relaying-systems(773aaeec-11e4-43b7-a1ff-cd3a86644a52).html.

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Abstract (sommario):
We introduce a Cooperative Distributed Multistage Spatial Diversity (CDMSD) scheme. By means of prior derived relaying topologies our algorithm relies on a robust and low complexity transceiver entity. CDMSD is implemented such as to improve throughput enhancement, coverage extension and spectral efficiency improvement. The benefits are provided by achieving full diversity and frequency selectivity. Simulation results are presented and compare to traditional non-distributed networks to support the analytical framework. Additionally fractional frame duration and transmitted power control are im
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2

Moço, Andreia Vieira. "Cooperative diversity schemes for wireless communication systems." Master's thesis, Universidade de Aveiro, 2008. http://hdl.handle.net/10773/2055.

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Abstract (sommario):
Mestrado em Engenharia Electrónica e Telecomunicações<br>A presente dissertação insere-se na área das comunicações sem fios, ou mais especificamente na temática da diversidade cooperativa. Neste trabalho é feito o estudo, implementação e avaliação do desempenho de esquemas de diversidade cooperativa de baixa complexidade para sistemas de comunicação móvel. Estes esquemas são mapeados em modelos de simulação baseados em OFDMA e são completamente simulados em CoCentric System Studio. Os resultados obtidos com os modelos desenvolvidos mostram que os esquemas de diversidade cooperativa atenuam
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3

Teodoro, Sara Helena Marques. "Distributed coding for systems with cooperative diversity." Doctoral thesis, Universidade de Aveiro, 2011. http://hdl.handle.net/10773/6045.

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Abstract (sommario):
Doutoramento em Engenharia Electrotécnica<br>O presente trabalho propõe-se a divulgar as mais significativas técnicas de esquemas cooperativos, de forma a ultrapassar alguns dos problemas dos sistemas móveis sem fios da próxima geração, estendendo a área de cobertura destes sistemas, assim como a sua capacidade e fiabilidade. O estudo de diversos esquemas cooperativos é efetuado em termos de capacidade e de taxa de erros, fazendo variar o número de relays e de antenas em cada elemento do sistema. Diversos algoritmos com aplicação em sistemas cooperativos são desenvolvidos e propostos ao longo
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4

Laneman, J. Nicholas. "Cooperative diversity in wireless networks : algorithms and architectures." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/29272.

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Abstract (sommario):
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.<br>Includes bibliographical references (p. 179-187).<br>To effectively combat multipath fading across multiple protocol layers in wireless networks, this dissertation develops energy-efficient algorithms that employ certain kinds of cooperation among terminals, and illustrates how one might incorporate these algorithms into various network architectures. In these techniques, sets of terminals relay signals for each other to create a virtual antenna array, trading off the costs-in
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5

Bletsas, Aggelos Anastasiou 1975. "Intelligent antenna sharing in cooperative diversity wireless networks." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33876.

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Abstract (sommario):
Thesis (Ph. D.)--Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2005.<br>Includes bibliographical references (p. 143-152).<br>Cooperative diversity has been recently proposed as a way to form virtual antenna arrays that provide dramatic gains in slow fading wireless environments. However, most of the proposed solutions require simultaneous relay transmissions at the same frequency bands, using distributed space-time coding algorithms. Careful design of distributed space-time coding for the relay channel is usually based on global
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6

Jardine, Allan. "Cooperative diversity in wireless networks : frameworks and analysis." Thesis, University of Edinburgh, 2007. http://hdl.handle.net/1842/12284.

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Abstract (sommario):
In spatial diversity, independently fading signals can be received by antenna elements separated by a small distance. Combining of the received signals can lead to an increase in the capacity and reliability of communications over the wireless channel. Spatial diversity can be achieved in a cellular network by sharing information between Mobile Terminals (MTs) where one MT acts as a relay supporting the data transmitted from the source in the first instance by forwarding information to the destination in the second instance. Due to the cooperation between MTs this is termed cooperative diversi
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7

Vien, Quoc-Tuan. "Cooperative diversity techniques for high-throughput wireless relay networks." Thesis, Glasgow Caledonian University, 2013. http://eprints.mdx.ac.uk/11685/.

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Abstract (sommario):
Relay communications has attracted a growing interest in wireless communications with application to various enhanced technologies. This thesis considers a number of issues related to data throughput in various wireless relay network models. Particularly, new implementations of network coding (NC) and space-time coding (STC) techniques are investigated to offer various means of achieving high-throughput relay communications. Firstly, this thesis investigates different practical automatic repeat request (ARQ) retransmission protocols based on NC for two-way wireless relay networks to improve th
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8

Neves, Darlene Maciel. "Channel estimation and parameters acquisition systems employing cooperative diversity." Doctoral thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/11963.

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Abstract (sommario):
Doutoramento em Engenharia Eletrotécnica e Telecomunicações<br>This work investigates new channel estimation schemes for the forthcoming and future generation of cellular systems for which cooperative techniques are regarded. The studied cooperative systems are designed to re-transmit the received information to the user terminal via the relay nodes, in order to make use of benefits such as high throughput, fairness in access and extra coverage. The cooperative scenarios rely on OFDM-based systems employing classical and pilot-based channel estimators, which were originally designed to point
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9

Perera, Ovitigalage Prasad Nalaka. "Cooperative diversity for performance enhancement of vehicular ad hoc networks." Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/87980/1/Ovitigalage%20Prasad%20Nalaka_Perera_Thesis.pdf.

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This project was a step forward in introducing suitable cooperative diversity transmission techniques for vehicle to vehicle communications. The contributions are intended to aid in the successful implementation of future vehicular safety and autonomous controlling systems. Several protocols were introduced for vehicles to communicate effectively without losing connectivity. This study investigated novel protocols in terms of diversity-multiplexing trade-off and outage for a range of potential vehicular safety and infotainment applications.
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10

Ni, Min. "Cooperative Distributed Transmission and Reception." Digital WPI, 2013. https://digitalcommons.wpi.edu/etd-dissertations/325.

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Abstract (sommario):
" In telecommunications, a cooperative scheme refers to a method where two or more users share or combine their information in order to increase diversity gain or power gain. In contrast to conventional point-to-point communications, cooperative communications allow different users in a wireless network to share resources so that instead of maximizing the performance of its own link, each user collaborates with its neighbours to achieve an overall improvement in performance. In this dissertation, we consider different models for transmission and reception and explore cooperative techniques tha
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11

Chen, J., and K. Djouani. "A multi-user cooperative diversity for wireless local area networks." Scientific Research Publishing, 2008. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000783.

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Abstract (sommario):
In this paper, an idea of using space-time block coding (STBC) in multi-user cooperative diversity has been exploited to improve the performance of the transmission in wireless local area networks. The theoretical and simulation results show that, using STBC approaches can always achieve the better performance than existing techniques without introducing the space-time coding. By analyzing the throughput and frame error ratio (FER) of the two different STBC cooperative schemes, we find the trade-off between throughput and reliability. The location of the relay is crucial to the performance, wh
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12

Fang, Wei. "Cooperative diversity aided direct-sequence code-division multiple-access systems." Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/64701/.

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Abstract (sommario):
In relay-assisted direct-sequence code-division multiple-access (DS-CDMA) systems, the distance between the relay and the destination receiver may be significantly shorter than that between the source transmitter and the destination receiver. Therefore, the transmission power of the relay may be significantly reduced in comparison to that of the source transmitter. In this thesis, we investigate the dependence of the achievable bit error ratio (BER) performance of DS-CDMA systems on the specific locations of the relays as well as on the power-sharing among the source transmitters and relays, w
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13

Ning, Haishi. "Cooperative strategies design based on the diversity and multiplexing tradeoff." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/9497.

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Abstract (sommario):
This thesis focuses on designing wireless cooperative communication strategies that are either optimal or near-optimal in terms of the tradeoff between diversity and multiplexing gains. Starting from classical cooperative broadcast, multiple-access and relay channels with unit degree of freedom, to more general cooperative interference channels with higher degrees of freedom, properties of different network topologies are studied and their unique characteristics together with several advanced interference management techniques are exploited to design cooperative transmission strategies in orde
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14

Tope, Michael A. "Performance evaluation of a cooperative diversity enhanced ad hoc network." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Dec%5FTope.pdf.

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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, December 2002.<br>Thesis advisor(s): John C. McEachen, R. Clark Robertson, Daniel M. Rosser. Includes bibliographical references (p. 73-75). Also available online.
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15

Pang, Kun. "Collaborative HARQ Schemes for Cooperative Diversity Communications in Wireless Networks." Thesis, The University of Sydney, 2008. http://hdl.handle.net/2123/2559.

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Abstract (sommario):
Wireless technology is experiencing spectacular developments, due to the emergence of interactive and digital multimedia applications as well as rapid advances in the highly integrated systems. For the next-generation mobile communication systems, one can expect wireless connectivity between any devices at any time and anywhere with a range of multimedia contents. A key requirement in such systems is the availability of high-speed and robust communication links. Unfortunately, communications over wireless channels inherently suffer from a number of fundamental physical limitations, such as mu
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16

Pang, Kun. "Collaborative HARQ Schemes for Cooperative Diversity Communications in Wireless Networks." School of Electrical & Information Engineering, The University of Sydney, 2008. http://hdl.handle.net/2123/2559.

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Master of Philosophy<br>Wireless technology is experiencing spectacular developments, due to the emergence of interactive and digital multimedia applications as well as rapid advances in the highly integrated systems. For the next-generation mobile communication systems, one can expect wireless connectivity between any devices at any time and anywhere with a range of multimedia contents. A key requirement in such systems is the availability of high-speed and robust communication links. Unfortunately, communications over wireless channels inherently suffer from a number of fundamental physical
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17

Alnawayseh, Saif Enad Ahmad. "Coded cooperative diversity with low complexity encoding and decoding algorithms." Thesis, Swansea University, 2011. https://cronfa.swan.ac.uk/Record/cronfa42648.

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Abstract (sommario):
One of the main concerns in designing the wireless communication systems is to provide sufficiently large data rates while considering the different aspects of the implementation complexity that is often constrained by limited battery power and signal processing capability of the devices. Thus, in this thesis, a low complexity encoding and decoding algorithms are investigated for systems with the transmission diversity, particularly the receiver diversity and the cooperative diversity. Design guidelines for such systems are provided to provide a good trade-off between the implementation comple
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18

Alabed, Samer. "Computationally Efficient Spatial and Cooperative Diversity Techniques for Wireless Communication Networks." Phd thesis, TU Darmstadt, 2012. https://tuprints.ulb.tu-darmstadt.de/2984/1/Samer_Alabed_Computationally_Efficient_Spatial_and_Cooperative_Diversity_Techniques_for_Wireless_Communication_Networks.pdf.

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Abstract (sommario):
Several techniques are recently proposed to improve the robustness of wireless communication systems, increase the throughput, and overcome channel impairments such as multi-user interference and multi-path fading. Among them, using multiple-antennas is one of the most remarkable techniques as it allows to improve the error performance and the data rate without an increase in the frequency bandwidth or transmitted power. However, multiple-antenna techniques are not applicable in all ad-hoc networks due to hardware constraints. As an alternative, cooperative diversity techniques have been propo
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19

Seddik, Karim G. "Diversity in cooperative networks how to achieve and where to exploit /." College Park, Md.: University of Maryland, 2008. http://hdl.handle.net/1903/8177.

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Abstract (sommario):
Thesis (Ph. D.) -- University of Maryland, College Park, 2008.<br>Thesis research directed by: Dept. of Electrical and Computer Engineering . Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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20

Poulimeneas, Dimitrios. "Back-pressure-like mechanisms on relay selection policies for cooperative diversity systems." Thesis, KTH, Reglerteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-167794.

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Abstract (sommario):
The topic of the current thesis is the reduction of the average packet delay in two-hop wireless cooperative networks with buffer-aided relays. This type of networks is of particular interest since it constitutes the building block for extended networks with multiple hops and numerous relays. Back-pressure-like algorithms are developed for the HRS and max − link relay selection schemes. First, an algorithm is developed and applied for both the HRS and the max − link protocols. It reduces the average delay considerably, but, in the case of the max − link the diversity of the system is reduced r
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21

Sohaib, Sarmad. "Energy efficient cooperative wireless communications." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/energy-efficient-cooperative-wireless-communications(a852e1e2-04ad-4311-8004-53babe529e1b).html.

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Abstract (sommario):
Cooperative diversity exploits the broadcast nature of wireless channels and uses relays to improve link reliability. Most cooperative communication protocols are assumed to be synchronous in nature, which is not always possible in wireless communication. Also the relay nodes are assumed to be half duplex which in turn reduces the spectral efficiency. In this thesis, we first present a novel asynchronous cooperative communication protocol exploiting polarization diversity, which does not require synchronization at the relay node. Dual polarized antennas are employed at the relay node to achiev
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22

Chembil, Palat Ramesh. "Performance analysis of cooperative communication for wireless networks." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/30080.

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Abstract (sommario):
The demand for access to information when and where you need has motivated the transition of wireless communications from a fixed infrastructure based cellular communications technology to a more pervasive adhoc wireless networking technology. Challenges still remain in wireless adhoc networks in terms of meeting higher capacity demands, improved reliability and longer connectivity before it becomes a viable widespread commercial technology. Present day wireless mesh networking uses node-to-node serial multi-hop communication to convey information from source to destination in the network. The
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23

Deng, Qingxiong. "Exploiting Diversity in Broadband Wireless Relay Networks." Digital WPI, 2012. https://digitalcommons.wpi.edu/etd-dissertations/360.

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Abstract (sommario):
"Fading is one of the most fundamental impairments to wireless communications. The standard approach to combating fading is by adding redundancy - or diversity - to help increase coverage and transmission speed. Motivated by the results in multiple-input multiple-output technologies, which are usually used at base stations or access points, cooperation commutation has been proposed to improve the performance of wireless networks which consist of low-cost single antenna devices. While the majority of the research in cooperative communication focuses on flat fading for its simplicity and easy an
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24

Alexopoulos, Konstantinos. "Performance analysis of decode-and-forward with cooperative diversity and Alamouti cooperative space-time coding in clustered multihop wireless networks." Thesis, Monterey, Calif. : Naval Postgraduate School, 2008. http://edocs.nps.edu/npspubs/scholarly/theses/2008/Sept/08Sep%5FAlexopoulos.pdf.

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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, September 2008.<br>Thesis Advisor(s): Tummala, Murali ; McEachen, John C. "September 2008." Description based on title screen as viewed on October 31, 2008. Includes bibliographical references (p. 95-98). Also available in print.
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25

Khan, Rana Azeem M. [Verfasser]. "MAC protocols for cooperative diversity in wireless sensor networks / Rana Azeem Muhammad Khan." Paderborn : Universitätsbibliothek, 2014. http://d-nb.info/1061069044/34.

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26

Avudainayagam, Arun. "Collaborative decoding achieving cooperative diversity in wireless networks using soft-input soft-output decoders /." [Gainesville, Fla.] : University of Florida, 2006. http://purl.fcla.edu/fcla/etd/UFE0013830.

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27

Butt, M. Majid. "On the Near-Far Gain in Opportunistic and Cooperative Multiuser Communications." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12009.

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Abstract (sommario):
In this dissertation, we explore the issues related to opportunistic and cooperative communications in a multiuser environment. In the first part of the dissertation, we consider opportunistic scheduling for delay limited systems. Multiuser communication over fading channels is a challenging problem due to fast varying channel conditions. On the other hand, it provides opportunities to exploit the varying nature of the channel and maximize the throughput by scheduling the user (or users) with good channel. This gain is termed as multiuser diversity. The larger the number of users, the greater
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28

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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29

Annavajjala, Ramesh. "Cross-layer design of wideband CDMA systems and cooperative diversity for wireless ad hoc networks /." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2006. http://wwwlib.umi.com/cr/ucsd/fullcit?p3222054.

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Abstract (sommario):
Thesis (Ph. D.)--University of California, San Diego, 2006.<br>Title from first page of PDF file (viewed September 20, 2006). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 139-145).
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30

Choi, Gi Wan. "Low-complexity and power-efficient wireless cooperative relay networks with enhanced reliability." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47721.

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Abstract (sommario):
In recent years, global mobile data traffic has been increasing exponentially as mobile devices pervade our daily lives. To cope with the ever growing demands for higher data rates and seamless connectivity, one solution is to drastically increase the number of macro base stations in the conventional cellular architecture. However, this results in high deployment costs. Deploying low-power nodes such as relays that do not require a wired backhaul connection within a macrocell is one of cost-effective ways to extend high data rate coverage range. Relays are typically deployed to increase signal
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31

Hussain, Nasir. "Cooperative communication in relay assisted wireless access networks." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/103528/1/Nasir_Hussain_Thesis.pdf.

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This research investigates the benefits of user cooperation in wireless communications systems. The dynamics of wireless cooperative communication systems are studied by a comprehensive study of two essential characteristics of cooperation, optimal relay selection criteria and practical channel estimation. A novel relay selection model based on realistic channel estimation is proposed and analysed. Furthermore, the gains are experimentally evaluated using a wireless communication testbed. The outcomes of this research reveal that incorporating cooperative techniques with an adaptive relay sele
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32

Ahmed, Sabbir. "Performance of Multi-Channel Medium Access Control Protocol incorporating Opportunistic Cooperative Diversity over Rayleigh Fading Channel." Thesis, Blekinge Tekniska Högskola, Avdelningen för signalbehandling, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-6171.

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This thesis paper proposes a Medium Access Control (MAC) protocol for wireless networks, termed as CD-MMAC that utilizes multiple channels and incorporates opportunistic cooperative diversity dynamically to improve its performance. The IEEE 802.11b standard protocol allows the use of multiple channels available at the physical layer but its MAC protocol is designed only for a single channel. The proposed protocol utilizes multiple channels by using single interface and incorporates opportunistic cooperative diversity by using cross-layer MAC. The new protocol leverages the multi-rate capabilit
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33

Gaspar, Karina da Silveira. "Lideranças femininas em uma instituição financeira de natureza cooperativa: análise das condições que viabilizam as mulheres chegarem a cargos de liderança executiva." Universidade do Vale do Rio dos Sinos, 2016. http://www.repositorio.jesuita.org.br/handle/UNISINOS/5453.

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Submitted by Silvana Teresinha Dornelles Studzinski (sstudzinski) on 2016-07-15T17:00:51Z No. of bitstreams: 1 Karina da Silveira Gaspar_.pdf: 1397809 bytes, checksum: e951133892fb230dbb6fb83f83f03c2d (MD5)<br>Made available in DSpace on 2016-07-15T17:00:51Z (GMT). No. of bitstreams: 1 Karina da Silveira Gaspar_.pdf: 1397809 bytes, checksum: e951133892fb230dbb6fb83f83f03c2d (MD5) Previous issue date: 2016-03-31<br>Nenhuma<br>Este trabalho tem como principal objetivo analisar as condições que viabilizam às mulheres, que compõem a instituição financeira estudada, ocuparem cargos de alta li
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34

UL, HAQ ANWAAR, and HAROON MALIK. "Cooperative Diversity and Power Consumption in Multi-hop WSN : Effects of node energy on Single Frequency Networks." Thesis, Mittuniversitetet, Avdelningen för informations- och kommunikationssystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-21564.

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At the present time, wireless sensor networks are becoming more and more  common and energy consumption is a key factor in the deployment and  maintenance of these networks. This thesis compares non-SFN multi-hop and  a single frequency network (SFN) or cooperative diversity algorithms with  respect to the energy consumed by the nodes. Since the nodes have limited  power capacity it is extremely important to have an efficient algorithm. In  addition, the behaviour of the network when SFN is employed must be  studied and advice offered with regards to improvements in order to achieve  preferent
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35

Chin, Yiyong. "Slotted cooperative communication in half duplex relay networks." Thesis, Queensland University of Technology, 2013. https://eprints.qut.edu.au/60551/1/Yiyong_Chin_Thesis.pdf.

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In cooperative communication systems, several wireless communication terminals collaborate to form a virtual-multiple antenna array system and exploit the spatial diversity to achieve a better performance. This thesis proposes a practical slotted protocol for cooperative communication systems with half-duplex single antennas. The performance of the proposed slotted cooperative communication protocol is evaluated in terms of the pairwise error probability and the bit error rate. The proposed protocol achieves the multiple-input single-output performance bound with a novel relay ordering and sch
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36

Hatefi, Atoosa. "Distributed Coding for Wireless Cooperative Networks." Thesis, Supélec, 2012. http://www.theses.fr/2012SUPL0015/document.

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Abstract (sommario):
Cette thèse est consacrée à l'étude théorique et à la conception pratique de schémas de codage conjoint réseau/canal adaptés à différents scénarii de communications dans les réseaux sans fil. Contrairement aux hypothèses conventionnelles retenues dans la littérature (accès multiple orthogonal, absence d'erreurs sur certains liens), les caractéristiques de diffusion et de superposition des signaux propres au canal radio et la présence d'évanouissements lents et de bruit sur tous les liens sont prises en compte dans la formulation du problème et exploitées. Différentes stratégies de coopération
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Alabed, Samer [Verfasser], Marius [Akademischer Betreuer] Pesavento, and Babak [Akademischer Betreuer] Khalaj. "Computationally Efficient Spatial and Cooperative Diversity Techniques for Wireless Communication Networks / Samer Alabed. Betreuer: Marius Pesavento ; Babak Khalaj." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2012. http://d-nb.info/1106115503/34.

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38

King, Thelma C. "Post-secondary students' and work-site supervisors' perceptions of diversity experiences and needs of students in a school-to-work transition program." Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-06062008-162247/.

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39

Yu, Hyungseok. "Performance of cooperative relaying systems with co-channel interference." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45744.

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Abstract (sommario):
The cooperative relaying scheme is a promising technique for increasing the capacity and reliability of wireless communication. Even though extensive research has performed in information theoretical aspect, there are still many unresolved practical problems of cooperative relaying system. This dissertation analyzes the performance of cooperative decode-and-forward (DF) relaying systems in the presence of multiple interferers and improve network throughput for these systems. We propose and summarize various systems in the view of network topology, transmission structure, and slot allocation. W
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40

Liu, Qijia. "Power efficiency and diversity issues for peak power constrained wireless communications." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34829.

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Along with the rapidly increasing demand for high data rate communications, orthogonal frequency division multiplexing (OFDM) has become a popular modulation in current and future communication standards. By distributing a high-speed data stream to many parallel low-rate data streams, OFDM is able to mitigate the detrimental effects of multipath fading using simple one-tap equalizers and achieve high spectral efficiency. However, the OFDM signal waveform suffers from large envelop variations, which are usually measured by the peak-to-average power ratio (PAR). In wireless transmitters, many RF
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Crow, Jacob, and Kim Jaeglin. "Cross cultural group projects in higher education and its effects on business school students : A mixed method study of students and young professionals in the business field." Thesis, Linköpings universitet, Företagsekonomi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-166753.

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The purpose of this research is to improve the understanding of challenges encountered by students when conducting groupwork and more specifically cross-cultural groupwork; which in turn helps with identifying structural flaws in the way cooperative learning is organized in student groups. More specifically, this study aims at identifying the challenges and opportunities inherent to student group work in order to develop a framework allowing schools and universities to improve the way their structure this exercise. The objective is to find a way for students to experience group work almost as
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Baleshan, Tharunie. "Analysis of distributed beamforming in cooperative communications network with phase shifter based smart antenna nodes." Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/84539/1/Tharunie_Baleshan_Thesis.pdf.

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This research study investigates the application of phase shifter-based smart antenna system in distributed beamforming. It examines the way to optimise the transmit power by jointly maximising the directivity of the array antennas and the weight vector for distributed beamforming. This research study concludes that maximising directivity can lead to better transmit power minimisation compared to maximising field intensity. This study also concludes that signal to noise power ratio maximisation subject to a power constraint and power minimisation subject to a signal to noise power ratio constr
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Melo, Marco Antonio Beserra de. "Diversidade multiusuÃrio em sistemas cooperativos com mÃltiplos relays: um esquema de seleÃÃo eficiente e de baixa complexidade." Universidade Federal do CearÃ, 2012. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=9400.

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FundaÃÃo Cearense de Apoio ao Desenvolvimento Cientifico e TecnolÃgico<br>Nesse trabalho, propÃe-se um esquema de seleÃÃo eficiente e de baixa complexidade para redes cooperativas multiusuÃrio multi-relay compostas de um nà fonte, L nÃs destinos e N nÃs relays. O esquema proposto primeiro seleciona o melhor destino baseado na qualidade de canal dos links diretos e entÃo seleciona o melhor relay que provà o melhor caminho da fonte para o destino selecionado. Considerando-se os protocolos de cooperaÃÃo decodifica-e-encaminha e amplifica-e-encaminha, o desempenho do sistema à investigado. Express
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Erasmus, Wilma. "Exploring quality and diversity : the role of the teacher in a class of diverse learners." Diss., University of Pretoria, 2011. http://hdl.handle.net/2263/27821.

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The advent of democracy has witnessed radical changes in the demographic constitution of the learner population in schools. Many teachers now encounter classes that comprise learners from diverse racial, ethnic, religious and language backgrounds. How do these teachers ensure quality education in such a class of diverse learners? Accordingly, this research study set out to explore quality and diversity in a class of diverse learners with particular emphasis on the role of the teacher. The meta-theoretical paradigm that directed it was a combination of constructivism and interpretivism. The met
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Phan, Hoc. "Performance Assessment of Cooperative Relay Networks with Advanced Radio Transmission Techniques." Doctoral thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00549.

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In the past decade, cooperative communications has been emerging as a pertinent technology for the current and upcoming generations of mobile communication infrastructure. The indispensable benefits of this technology have motivated numerous studies from both academia and industry on this area. In particular, cooperative communications has been developed as a means of alleviating the effect of fading and hence improve the reliability of wireless communications. The key idea behind this technique is that communication between the source and destination can be assisted by several intermediate no
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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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Wu, Victor Kai Yuen. "OFDM-based cooperative communications in a single path relay network and a multiple path relay network." Thesis, Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-11092006-152421/.

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Shastry, Naveen A. "Cooperative diversity in wireless networks." 2005. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=370245&T=F.

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Eid, Amr Mohamed. "Cooperative diversity in CDMA networks." Thesis, 2009. http://spectrum.library.concordia.ca/976483/1/MR63077.pdf.

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Spatial diversity is one of the well known diversity methods used in combating fading channels. Recently, cooperative diversity has been widely studied in literature as a spatial diversity technique. Different from multiple-input multiple-output (MIMO) systems, each user in the cooperative network is employed with a single transmit/receive antenna. In this thesis, we propose a cooperative diversity technique for asynchronous direct sequence code division multiple access (D8-CDMA) over frequency selective slow fading environment. First we assume the single cooperation relay case, where the bit-
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Hussain, Muhammad Jawwad. "Cooperative Diversity for Inter-Vehicular Communications." Thesis, 2008. http://hdl.handle.net/10012/3670.

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Recent technological advances and pervasiveness of wireless communication devices have offered novel and promising solutions to the road safety problem and on-the-go entertainment. One such solution is the Inter-Vehicular Communications (IVC) where vehicles cooperate in receiving and delivering the messages to each other, establishing a decentralized communication system. The communication between vehicles can be made more effective and reliable at the physical layer by using the concept of space-time coding (STC). STC demonstrated that the deployment of multiple antennas at the transmitter
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