Дисертації з теми "Relayed communication systems"
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Negi, Ansuya. "Analysis of Relay-based Cellular Systems." PDXScholar, 2006. https://pdxscholar.library.pdx.edu/open_access_etds/2668.
Повний текст джерелаLee, Justine Bing. "Transceiver Designs for MIMO Relay Communication Systems." Thesis, Curtin University, 2021. http://hdl.handle.net/20.500.11937/83305.
Повний текст джерелаDong, Linhao. "Resource allocation for relay based green communication systems." Thesis, University of Liverpool, 2013. http://livrepository.liverpool.ac.uk/15233/.
Повний текст джерелаGopal, Lenin. "Robust transceiver designs for MIMO relay communication systems." Thesis, Curtin University, 2015. http://hdl.handle.net/20.500.11937/643.
Повний текст джерелаNguyen, Khoa Xuan. "Transceiver Optimization for Interference MIMO Relay Communication Systems." Thesis, Curtin University, 2017. http://hdl.handle.net/20.500.11937/48822.
Повний текст джерелаDai, 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.
Повний текст джерелаYang, Weidong. "Vector channel study and related issues in selective transceiving /." Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.
Повний текст джерелаKawanishi, Kenichi. "Studies on Batch Arrival Models and Related Traffic Issues in Communication Systems." 京都大学 (Kyoto University), 2001. http://hdl.handle.net/2433/150627.
Повний текст джерелаKhandaker, Muhammad Ruhul Amin. "Signal processing algorithms for multiuser MIMO relay communication systems." Thesis, Curtin University, 2012. http://hdl.handle.net/20.500.11937/1797.
Повний текст джерелаWu, 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/.
Повний текст джерелаTo, Duc. "Coded systems and techniques for wireless communications with/without relays." Thesis, Swansea University, 2011. https://cronfa.swan.ac.uk/Record/cronfa43104.
Повний текст джерелаMuratori, Erik. "Analysis of Space Communication Systems via Satellite Relaying." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/22837/.
Повний текст джерелаYeung, Wing Lok. "System development with communicating sequential processes : formalisation and related studies." Thesis, Staffordshire University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303217.
Повний текст джерелаLi, Houmin Thomas Gwynedd A. "Geotextile antenna design for mobile phone cooperative communication relay node." Auburn, Ala., 2008. http://hdl.handle.net/10415/1498.
Повний текст джерелаKwon, Bongkyoung Kwon. "Adaptive frame structure and OFDMA resource allocation in mobile multi-hop relay networks." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31818.
Повний текст джерелаCommittee Chair: Dr. John A. Copeland; Committee Member: Dr. George F. Riley; Committee Member: Dr. Henry L. Owen; Committee Member: Dr. Mary Ann Ingram; Committee Member: Dr. Patrick Traynor. Part of the SMARTech Electronic Thesis and Dissertation Collection.
姍, 路., and Shan Lu. "Coding and decoding for multiuser communication systems." Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12863897/?lang=0, 2014. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12863897/?lang=0.
Повний текст джерелаCoding and decoding for multiuser communication systems are investigated. For MAAC, we propose a coding scheme of (k + 1)-ary error-correcting signature codes. We give binary and non-binary signature codes. They are the best error-correcting signature codes for MAAC, in the sense that they have highest sum rates known. For TWRC, we propose a low-complexity two-user turbo decoding scheme when turbo codes are applied in two users. The approximate decoding algorithm preserves low decoding complexity over the Gaussian TWRC, without much performance degradation.
博士(工学)
Doctor of Philosophy in Engineering
同志社大学
Doshisha University
Sousa, Igor FlÃvio SimÃes de. "Distributed processing in receivers based on tensor for cooperative communications systems." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=12792.
Повний текст джерелаEricsson Brasil
In this dissertation, we present a distributed data estimation and detection approach for the uplink of a network that uses CDMA at transmitters (users). The analyzed network can be represented by an undirected and connected graph, where the nodes use a distributed estimation algorithm based on consensus averaging to perform joint channel and symbol estimation using a receiver based on tensor signal processing. The centralized receiver, developed for a central base station, and the distributed receiver, developed for micro base stations, have their performances compared in a heterogeneous network. Then, two tensor-based receivers are proposed to be used in a relay-assisted network. In this case, the proposed receiver makes use of collaborative signal processing among relays to recover sources information before forwarding to the base station using a Decode-and-Forward protocol. The first receiver is based on the uncoded transmission of the tensor data reconstructed by the relays from the estimation of their factors matrix. The second one considers a tensor encoding of symbols estimated at the relays before transmission to the base station. The different proposed receivers are compared by means of computer simulations in terms of convergence and bit error rate.
Nesta dissertaÃÃo, apresentamos uma abordagem distribuÃda para a estimaÃÃo e detecÃÃo de dados para uplink em uma rede que emprega CDMA nos transmissores (usuÃrios). A rede analisada pode ser representada por um grafo sem direÃÃo e conectado, em que os nÃs fazem uso de um algoritmo de estimaÃÃo distribuÃda baseado em consenso mÃdio para realizar a estimaÃÃo conjunta de sÃmbolos transmitidos e do canal, utilizando um receptor baseado em processamento tensorial. O receptor centralizado, operando em uma EstaÃÃo RÃdio Base central, e o receptor distribuÃdo, operando em Micro EstaÃÃes RÃdio Base, tÃm seus desempenhos comparados em uma rede heterogÃnea. Em seguida, considerando-se uma rede assistida por repetidores, dois receptores tensoriais sÃo propostos. Neste caso, fazemos uso de um processamento de sinais colaborativo entre os repetidores para a recuperaÃÃo da informaÃÃo transmitida pela fonte, antes de ser encaminhada para estaÃÃo rÃdio base fazendo uso do protocolo Decode-and-Forward. O primeiro receptor à baseado na transmissÃo nÃo codificada do tensor de dados reconstruÃdo pelos repetidores a partir da estimaÃÃo de suas matrizes fatores. O segundo considera uma codificaÃÃo tensorial dos sÃmbolos previamente estimados nos repetidores antes da transmissÃo para estaÃÃo rÃdio base. Os diferentes receptores propostos sÃo comparados atravÃs de simulaÃÃes computacionais em termos de convergÃncia e taxa de erro de bit.
Musa, Ismail Kalimullah. "Optimal Robust Transceiver Designs for Non-regenerative Multicasting MIMO Relay Communication Systems." Thesis, Curtin University, 2017. http://hdl.handle.net/20.500.11937/65944.
Повний текст джерелаZhang, Jin. "Relay and routing selection in relay-based wireless networks /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?CSED%202009%20ZHANG.
Повний текст джерелаJayasinghe, L. K. (Laddu Keeth Saliya). "Analysis on MIMO relaying scenarios in wireless communication systems." Doctoral thesis, Oulun yliopisto, 2015. http://urn.fi/urn:isbn:9789526207391.
Повний текст джерелаTiivistelmä Tässä väitöskirjassa keskitytään arvioimaan ja parantamaan suorituskykyä useissa moniantennitoistinjärjestelmissä, jotka ovat ajankohtaisia tulevaisuuden langattomissa verkoissa. Erityisesti työssä analysoidaan tärkeitä käytännön tilanteita, sisältäen toistimien sijoittamisen, kanavatiedon saatavuuden, rajoitetun taajuuskaistan ja tiedon salauksen. Aluksi epäkoherentin, vahvistavan ja jatkolähettävän moniantennitoistimen suorituskykyä analysoidaan tilanteessa, jossa toistin on sijoitettu siten, että kohteeseen on suora yhteys. Suorituskyvyn arvioinnin pääkohteena on ortogonaalinen tila-aika-tason lohkokoodattu epäkoherentti vahvistava ja jatkolähettävä moniantennitoistin. Työssä johdetaan tarkat lausekkeet tilastollisille parametreille ja suorituskykymittareille ottaen huomioon hetkellinen signaalikohinasuhde vastaanottimessa. Nämä suorituskykymittarit ilmaisevat, että toistimen ja kohteen välillä oleva vahva suoran yhteyden komponentti rajoittaa sitä suorituskykyä, jota moniantennijärjestelmän hajontaympäristö ennustaa. Työssä tutkitaan myös kahdensuuntaisia moniantennitoistimia, jotka käyttävät fyysisen kerroksen verkkokoodausta. Koodauksesta tulee monimutkaista, kun monia datavirtoja yhdistetään toistimessa. Tämän helpottamiseksi käytetään yhdistettyä esikoodaus-dekoodausmenetelmää, jota tutkitaan erilaisten kanavatietojen tapauksissa. Täydellisen kanavatiedon tapauksessa käytetään nollaanpakotuskriteeriä. Epätäydellisen kanavatiedon tapauksessa käytetään robustia yhdistettyä esikoodaus-dekoodausmenetelmää. Esikoodaus- ja dekoodausmatriisit saadaan ratkaisemalla optimointiongelmat. Nämä ongelmat on muodostettu maksimoimaan summadatanopeus, ja minimoimaan painotettu keskineliövirhe, kun optimointirajoitteina ovat solmujen lähetystehot. Seuraavaksi esikoodaus-dekoodausmenetelmää tutkitaan moniantennijärjestelmässä, jossa käytetään kahdentyyppistä laitteesta-laitteeseen (D2D) kommunikaatiomenetelmää: fyysisen kerroksen verkkokoodaukseen pohjautuvaa D2D- ja suoraa D2D-kommunikaatiota. Yhteissuunnittelu perustuu keskineliövirheen minimointiin, joka on hyödyllistä, kun halutaan vähentää häiriötä ja parantaa molempien verkkojen suorituskykyä. Työssä ehdotetaan hajautettuja ja keskitettyjä algoritmeja tilanteessa, jossa käytetään kaksisuuntaista kommunikaatiota molemmissa verkoissa. Järjestelmän suorituskykyä arvioidaan, kun käytetään kahta eri lähetystilan valintaa, dynaamista ja staattista. Tulokset osoittavat, että fyysisen kerroksen verkkokoodaukseen pohjautuva D2D kasvattaa D2D-kommunikaatiojärjestelmän kantamaa. Lopuksi, turvallisia keilanmuodostustekniikoita arvioidaan fyysisen kerroksen verkkokoodaukseen pohjautuvassa kahdensuuntaisessa moniantennitoistinjärjestelmässä, kun useat salakuuntelijat yritävät siepata käyttäjätiedon. Käyttäjillä on epäideaalinen kanavatieto heidän ja salakuuntelijoiden välisten linkkien kanavista. Kanavatiedon estimointivirheitä arvioidaan ellipsoidisella ja Gauss-Markov-epävarmuusmallilla. Robustit optimointiongelmat, joissa suunnitellaan keilanmuodostusvektorit käyttäjän ja toistimen välille, muodostetaan molemmille malleille. Numeeriset tulokset osoittavat, että ehdotetut algoritmit konvergoituvat nopeasti ja tarjoavat korkeamman turvallisuuden
Bui, Tuyen Thi Bich Electrical Engineering & Telecommunications Faculty of Engineering UNSW. "Superposition coding and modulation technique for wireless relay systems." Awarded by:University of New South Wales, 2007. http://handle.unsw.edu.au/1959.4/36827.
Повний текст джерелаZhang, Shunqing. "Cooperative relay in the next generation wireless networks /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?ECED%202009%20ZHANGS.
Повний текст джерелаChen, Yi-Da. "The Dynamics of Task-related Discussion in the Pursuit of Radical Innovation: Innovation Project Teams as Interpretation Systems." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/311106.
Повний текст джерелаWang, Hongzheng. "Performance analysis of cooperative systems with spatial random relays and interfering nodes." Click to view the E-thesis via HKUTO, 2010. http://sunzi.lib.hku.hk/hkuto/record/B44205041.
Повний текст джерелаHinic, Vladimir. "Brain computer interface system for communication and robot control based on auditory evoked event-related potentials." Thesis, University of Ottawa (Canada), 2009. http://hdl.handle.net/10393/28226.
Повний текст джерелаBeins, Eva Carolina [Verfasser]. "The role of the endocannabinoid system in stress-related disorders and neuroimmune communication / Eva Carolina Beins." Bonn : Universitäts- und Landesbibliothek Bonn, 2020. http://d-nb.info/1218301619/34.
Повний текст джерелаAbaza, Mohamed. "Cooperative MIMO techniques for outdoor optical wireless communication systems." Thesis, Brest, 2015. http://www.theses.fr/2015BRES0073/document.
Повний текст джерелаFree-space optical (FSO) communication has been the subject of ongoing research activities and commercial attention in the past few years. Such attention is driven by the promise of high data rate, license-free operation, and cheap and ecological friendly means of communications alternative to congested radio frequency communications. In most previous work considering multiple transmitters, uncorrelated channel conditions have been considered. An uncorrelated channel requires sufficient spacing between transmitters. However, this can be difficult and may not be always feasible in some applications. Thereby, this thesis studies repetition codes (RCs) and orthogonal space-time block codes performance in correlated log-normal FSO channels using intensity modulation and direct detection (IM/DD). Furthermore, the effect of different weather conditions on the average bit error rate (ABER) performance of the FSO links is studied. Multiple-input multiple-output (MIMO) FSO communication systems using space shift keying (SSK) modulation have been also analyzed. Obtained results show that SSK is a potential technique for spectral efficiencies equal or greater than 4 bits/s/Hz as compared to RCs with multiple pulse amplitude modulations. The performance analysis of a multi-hop decode and forward relays for FSO communication system using IM/DD is also considered in this thesis. It is shown that multi-hop is an efficient technique to mitigate atmospheric turbulence and different weather attenuation effects and geometric losses in FSO communication systems. Our simulation results show that multiple-input single-output (MISO) multi-hop FSO systems are superior to direct link and MISO systems over links exhibiting high attenuation. Meeting the growing demand for higher data rates communication networks, a system with full-duplex (FD) relays is considered. For such a system, the outage probability and the ABER performance are analyzed under different turbulence conditions, misalignment error and path loss effects. FD relays are compared with the direct link and half-duplex relays. Obtained results show that FD relays have the lowest ABER and the outage probability as compared to the two other systems. Finally, the obtained results in this thesis are very promising towards the next generation of FSO systems
Xu, Ning. "Physical-Layer Network Coding for MIMO Systems." Thesis, University of North Texas, 2011. https://digital.library.unt.edu/ark:/67531/metadc68065/.
Повний текст джерелаPatel, Chirag S. "Wireless channel modeling, simulation, and estimation." Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-03282006-200818/.
Повний текст джерелаAndrew, Alfred, Committee Member ; Durgin, Gregory, Committee Member ; Li, Geoffrey, Committee Member ; Ingram, Mary Ann, Committee Member ; Stuber, Gordon, Committee Chair.
Duo, Bin. "Polar Coding Schemes for Cooperative Transmission Systems." Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/14619.
Повний текст джерелаPendli, Pavan Kumar [Verfasser]. "Contribution of Modelling and Analysis of Wireless Communication for Safety related Systems with Bluetooth Technology / Pavan Kumar Pendli." Kassel : Kassel University Press, 2014. http://d-nb.info/1065688385/34.
Повний текст джерелаWalldén, Marcus, and Aylin Özkan. "A graph database management system for a logistics-related service." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-205184.
Повний текст джерелаHögre krav på databassystem har lett till en ökad popularitet för vissa databassystemstyper i några nischområden. Ett sådant nischområde är grafnätverk, såsomsociala nätverk eller logistiknätverk. Analyser på grafnätverk fokuserar ofta påkomplexa relationsmönster som ibland inte kan lösas effektivt av traditionella relationsdatabassystem, vilket har lett till att vissa specialiserade icke-relationella databassystem har blivit populära alternativ. Många av de populära databassystemen inom detta område är grafdatabassystem. Detta arbete presenterar en prototyp av en logistiknätverksrelaterad tjänst som använder sig av ett grafdatabashanteringssystem som heter Neo4j, vilket är det mest använda grafdatabashanteringssystemet. Logistiknätverket som täcks av tjänsten är baserad på existerande data från PostNord, Sveriges ledande leverantör av logistiklösningar, och fokuserar primärt på kundsupport och företagsrelaterad analys. Genom att skapa en prototyp av tjänsten strävar detta arbete efter att uppvisa vissa av de positiva och negativa aspekterna av ett grafdatabashanteringssystem samt att visa hur en tjänst kan skapas genom att använda ett grafdatabashanteringssystem. Resultaten indikerar att Neo4j är väldigt intuitivt och lättanvänt, vilket skulle göra den optimal för prototyping och mindre system, men på grund av den använda evalueringsmetoden så behöver mer forskning inom detta område utföras innan dessa slutsatser kan bekräftas.
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.
Повний текст джерелаRangavajjula, Santosh Bharadwaj. "Design of information tree for support related queries: Axis Communications AB : An exploratory research study in debug suggestions with machine learning at Axis Communications, Lund." Thesis, Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-16826.
Повний текст джерелаChoi, 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.
Повний текст джерелаOlson, Kristin. "Water carved out the mountains. Policy communication of Engaged Buddhists related to international development cooperation." Thesis, Malmö högskola, Fakulteten för kultur och samhälle (KS), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-22363.
Повний текст джерелаThe study “Water carved out the mountains. Policy communication of Engaged Buddhists related to international development cooperation” contributes to an understanding of development from perspectives of non-denominational action among so called Engaged Buddhists. Departing from qualitative interviews with nine leaders of socially engaged organizations from five Asian countries, the systemic programming resulting from their ideals are compared to key principles and programming of international development cooperation. Responding to the question:”What policy ideals shape the development programming, and can these be linked to forms of power and the rights-based approach?” this inter-disciplinary and multi-sited study feeds into the increased interest in faith-based expressions within the general public sphere, and specifically in the development industry. Guided by the ontology of critical realism, a mixed method is used shaped by qualitative interviews and participatory observations, enabling both analysis of meanings and development programming. Based on their views on Buddhist ethics and practices, the leaders address development topics common today. Policies expressed are placed within a communication culture for change, yet not necessarily by conventional confrontational advocacy modes. Diverse understandings are at play, such as how to convey meanings of “kindness”. Although not referring to concepts common within the social and cultural structures of contemporary international development cooperation, the actors develop methods based on principles of participation in particular and the work today can also be related to other principles of the Human Rights Based Approach. The policies and programming are linked to invisible, informal and formal forms of power although informants refer to interpretations of compassion, inter-relatedness and non-dualism, among other.From a perspective of development cooperation, a hypothetical argument is advanced suggesting that the informants do not differ at substantial level related to their understanding and practice of Buddhism or their general approaches to development topics, as much as they differ regarding their approach to programming aimed at influencing forms of power. The common criticism of Buddhists not addressing power can then for this group be nuanced, and indicatively suggested not to be valid regarding invisible and informal power, but rather regarding formal power.Academic fields: Communication for development with reference to sociology of religion, political science, global studies and multi-sited ethnography.Key words: Engaged Buddhism, Civil Society Organizations, Faith-Based Organizations, Human Right Based Approach, participation, complexity/systemic approaches, power, Thich Nhath Hanh, Sister Chan Khong, Sulak Sivaraksa, Bikkhuni Dhammananda, A.T. Ariyaratne, Sarvodaya.
Ozgur, Utku. "Development of a Remotely Accessible Wireless Testbed for Performance Evaluation of AMI Related Protocols." FIU Digital Commons, 2017. http://digitalcommons.fiu.edu/etd/3177.
Повний текст джерелаAdvaita, 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.
Повний текст джерелаGarcia, Gilbert O. Joseforsky David C. "Transformational communications architecture for the Unit Operations Center (UOC) ; Common Aviation Command and Control System (CAC2S) ; and Command and Control on-the-move Network, Digital over-the-horizon Relay (CoNDOR) /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Jun%5FGarcia%5FJoseforsky.pdf.
Повний текст джерелаAbadi, Tarla. "Design and performance analysis of cooperative relay systems." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/design-and-performance-analysis-of-cooperative-relay-systems(8edce5bc-1518-4df2-aa49-36bf5386036a).html.
Повний текст джерелаTimilsina, Santosh. "Physical Layer Security in Training-Based Single-Hop/Dual-Hop Massive MIMO Systems." OpenSIUC, 2018. https://opensiuc.lib.siu.edu/theses/2376.
Повний текст джерелаRodr00EDguez, Eric Noel. "Exploration of K-5 Teacher Decision-Making Related to Student Use of Technology." ScholarWorks, 2019. https://scholarworks.waldenu.edu/dissertations/7731.
Повний текст джерелаKaufmann, Tobias [Verfasser]. "Brain-Computer Interfaces Based on Event-Related Potentials: Toward Fast, Reliable and Easy-To-Use Communication Systems for People with Neurodegenerative Disease / Tobias Kaufmann." München : Verlag Dr. Hut, 2013. http://d-nb.info/1045988146/34.
Повний текст джерелаBasharati, Sarhad. "MIMO and Relay Systems Based on Multi-Amplitude Minimum Shift Keying." Thesis, University of Canterbury. Electrical and Computer Engineering, 2013. http://hdl.handle.net/10092/8491.
Повний текст джерелаBentley, Grace Ann. "Neurophysiological Correlates of the Critical Bandwidth in the Human Auditory System." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5619.
Повний текст джерелаLindkvist, Hannes. "Participation for Sustainable Urban Freight Transport Systems : A Case Study of Freight Receivers in the City of Gothenburg." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-324573.
Повний текст джерелаLo, Caleb K. 1981. "Relay-assisted communication : fundamental limits and selection strategies." 2008. http://hdl.handle.net/2152/18163.
Повний текст джерелаtext
Shao, Yunlong. "Precoding for MIMO full-duplex relay communication systems." Thesis, 2018. https://dspace.library.uvic.ca//handle/1828/9213.
Повний текст джерелаGraduate
MinhPhuong, Do Thi, and 杜氏明芳. "Relay Selection for D2D Communication Systems inCellular Networks." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/07845248640906555273.
Повний текст джерела國立成功大學
工程科學系
102
Nowadays, the explosive development on the number of mobile user and multimedia services cause a severe traffic overload problem in the cellular network. Data offloading in the Third-Generation Partnership Project (3GPP) is defined as critical scheme to cope with this issue. Furthermore, device-to-device (D2D) communications have been considered as a new data-offloading solution. The D2D communications underlay cellular networks infrastructure reduces the radio access network load and the core network load. Device-to-device (D2D) communication commonly refers to a technology that enables devices to communicate directly without access points, base stations, and wireless operators. With the application of specific rules and strategies, D2D communications decrease the mobile network load and increase the spectral efficiency. Moreover, relay assisted transmissions are considered in this thesis to efficiently improve the performance of relay assisted D2D communications when D2D user equipments (UEs) are too far away from each other or the quality of the D2D channel is not good enough for direct communications. Thereafter, the relay selection issues on D2D communication in cellular network is studied in this thesis. Finally, a centralized relay selection method for relay assisted D2D communication systems is proposed in this thesis.
Yen, Chin-Yi, and 顏進益. "Channel Estimation for Relay Based Cooperative Communication Systems." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/71327446104476554469.
Повний текст джерела淡江大學
電機工程學系碩士班
96
Although many researches on relay-based cooperative coherent communication systems have shown that the benefits of spatial diversity, saying cooperative diversity, can be achieved as the multi-antenna technologies do, the analyses primarily rely on the assumption that the perfect channel state information (CSI) is available at the receiver. In practical scenarios, the CSI has to be estimated and the effect of imperfect CSI on system performance needs to be analyzed. In this thesis, we study the channel estimation problem for amplify-and-forward (AF) relay-based cooperative communication systems. For AF transmission scheme, the relay amplifies the received signal from the source by a fixed or variable gain and forwards it to the destination. Depending on the mobility of the relay, we consider both the fixed-to-mobile channel model and the mobile-to-mobile channel model. To facilitate the channel estimation task, we employ the pilot symbol assisted modulation (PSAM) and consider the linear minimum mean-squared error (LMMSE) as the estimation criterion. Computer simulations are conducted to illustrate the influences of the imperfect CSI on the performance of AF relay-based communication systems.