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Rozprawy doktorskie na temat „CDMA”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 25 lipca 2025

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1

Deus, Junior Getulio Antero de. "Sistemas FFH-CDMA codificados." [s.n.], 2002. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260269.

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Orientador : Jaime Portugheis<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação<br>Made available in DSpace on 2018-08-02T01:11:32Z (GMT). No. of bitstreams: 1 DeusJunior_GetulioAnterode_D.pdf: 9215941 bytes, checksum: 93364e4dd602d44e4f2d6d1758043dfd (MD5) Previous issue date: 2002<br>Resumo: Neste trabalho é desenvolvido um estudo sobre um sistema FFH-CDMA cujo receptor de máxima verossimilhança (MV) não-quantizado necessita de uma não-linearidade de difícil implementação. Para um sistema FFH-CDMA não-codificado propomos a utilização
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Venkatasubramanian, Ramasamy. "Beamforming for MC-CDMA." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/31287.

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Orthogonal Frequency Division Multiplexing (OFDM) has recently gained a lot of attention and is a potential candidate for Fourth Generation (4G) wireless systems because it promises data rates up to 10Mbps. A variation of OFDM is Multi-Carrier CDMA (MC-CDMA) which is an OFDM technique where the individual data symbols are spread using a spreading code in the frequency domain. The spreading code associated with MC-CDMA provides multiple access technique as well as interference suppression. Often times in cellular and military environments the desired signal can be buried below interference. I
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LE, BOT MARIE. "Antennes adaptatives en CDMA." Paris, CNAM, 2001. http://www.theses.fr/2001CNAM0384.

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Ce rapport de these traite de la demodulation a la station de base multi-capteurs dans le cadre d'une communication radiomobile en cdma. Apres un rappel du systeme cdma, nous analysons le canal de propagation. Nous presentons le recepteur optimal (mlse) dans le cas general d'une modulation lineaire, puis applique au cdma. Nous valorisons alors le role des codes d'etalement dans la demodulation en les separant du traitement spatio-temporel, qui est adapte au canal et rejette les brouilleurs. Nous proposons deux facons differentes de mettre en uvre le mlse, qui tiennent compte de la coloration s
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SHARMA, ANSHUL. "Performance Analysis of MC-CDMA and CI/MC-CDMA Using Interference Cancellation Techniques." University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1218826853.

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SHEN, HANHONG. "SEMIBLIND MULTIUSER DETECTION FOR MC-CDMA." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1127324165.

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6

Jakubek, David Andrew. "Coherent/noncoherent detection of coherent optical heterodyne DPSK-CDMA and MFSK-CDMA signals." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/28033.

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7

Haiou, Zheng, and Zhang Naitong. "ANALYSIS OF HYBRID FDMA/CDMA SYSTEMS IN RICIAN FADING." International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/606808.

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International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>In this paper, a hybrid frequency division multiple access/code division multiple access (FDMA/CDMA) system in a Rician fading channel is described and analysis. The performance of the hybrid system is compared with a wideband CDMA system, which occupies the same total bandwidth. The results show that for DPSK modulation with a RIKE receiver, a hybrid system can have a greater capacity with a strong direct path component or a high signal to noise ratio (SNR).
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8

Cheung, Tze Chiu. "2GHz W-CDMA Radio Transceiver." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36411.

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A radio transceiver has been designed and built for a W-CDMA experimental system operating at 2GHz. The radio is an RF front-end for mobile terminals. The radio provides the functions of modulation and demodulation to enable transmitting and receiving digital information through the air link. The radio comprises one transmitter in conjunction with transmit power control (TPC), two independent receivers in conjunction with automatic gain control (AGC) and automatic frequency control (AFC), and one common synthesizer. Data exchange between the radio and the baseband processor takes place i
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9

Duran, Omer Agah. "Multiuser Receivers For Cdma Downlink." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609953/index.pdf.

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In this thesis, multiuser receivers for code division multiple-access (CDMA) downlink are studied under frequency selective fading channel conditions. The receivers investigated in this thesis attempt to estimate desired symbol as a linear combination of chip-rate sampled received signal sequence. A common matrix-vector representation of signals, which is similar to the model given by Paulraj et. al. is constructed in order to analyze the receivers studied in this thesis. Two receivers already well known in the literature are introduced and derived by using the common signal model. One of th
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10

Wan, William Ming. "Digital CDMA multi-carrier demodulator." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/MQ28260.pdf.

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11

Sorokine, Vladislav. "Gallager codes for CDMA applications." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ35329.pdf.

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12

Tanner, Rudolf. "Nonlinear receivers for DS-CDMA." Thesis, University of Edinburgh, 1999. http://hdl.handle.net/1842/1377.

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The growing demand for capacity in wireless communications is the driving force behind improving established networks and the deployment of a new worldwide mobile standard. Capacity calculations show that the direct sequence code division multiple access (DS-CDMA) technique has more capacity than the time division multiple access technique. Therefore, most 3rd generation mobile systems will incorporate some sort of DS-CDMA. In this thesis DS-CDMA receiver structures are investigated from the view point of pattern recognition which leads to new DS-CDMA receiver structures. It is known that the
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13

Huang, Hu, and 黃鵠. "Multicarrier DS/SFH-CDMA systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31222705.

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14

Iltis, Ronald A. "Localization Using CDMA-MIMO Radar." International Foundation for Telemetering, 2010. http://hdl.handle.net/10150/605975.

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ITC/USA 2010 Conference Proceedings / The Forty-Sixth Annual International Telemetering Conference and Technical Exhibition / October 25-28, 2010 / Town and Country Resort & Convention Center, San Diego, California<br>A MIMO radar system for target localization is presented which uses direct-sequence CDMA (DS-CDMA) waveforms. The received DS-CDMA signal at each antenna is expressed directly in terms of the target positions. The waveforms employed are Gold sequences, and hence are not exactly orthogonal. A generalized successive interference cancellation (GSIC) approach is used to resolve multi
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15

Filho, Rivail Vilas Boas dos Santos. "Análise de sistemas CDMA ópticos." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/18/18133/tde-06102006-104349/.

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A evolução das redes ópticas para atender o crescimento da demanda por largura de banda tem estimulado a busca por uma maior eficiência na utilização da largura de faixa disponível. O sucesso da implementação prática da técnica de acesso múltiplo por divisão de código (CDMA) em sistemas de comunicações móveis também despertou o interesse por aplicações em redes ópticas (OCDMA). Atributos únicos tais como capacidade flexível sob demanda, segurança na comunicação e alta escalabilidade, incentivaram significativamente as pesquisas. Neste contexto, este trabalho apresenta, primeiramente, uma revis
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16

Huang, Hu. "Multicarrier DS/SFH-CDMA systems /." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22053839.

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17

Woodward, Graeme Kenneth. "Adaptive detection for DS-CDMA." Thesis, The University of Sydney, 1999. https://hdl.handle.net/2123/27691.

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Adaptive techniques for detection of direct sequence code division multiple access (DS—CDMA) signals are investigated. The goal is to improve CDMA system performance and capacity relative to conventional systems by reducing interference between users. The techniques considered are adaptive versions of multiuser receiver structures. Most multiuser receivers proposed to date suffer from overly high computational complexity or impractical levels of assumed system knowledge. Adaptive techniques may be used to improve the feasibility of certain classes of multiuser receivers. Receivers estimat
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18

Hu, Teck Hon 1965. "A multirate DS-CDMA system." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/282425.

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A rapidly growing interest in third generation Personal Communication Networks has underlined the importance of wireless multimedia systems that can support voice, video, images, files, or any combinations thereof. In order to ensure satisfactory quality of service (QoS) for individual multimedia traffic, a new analysis with a new user model based on circuit-switched direct-sequence Code Division Multiple Access (DS-CDMA) system is presented. The new user model is introduced to allow users to transmit data at multiple bit rates and to switch to other bit rates at any time. To facilitate perfor
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19

Kejík, Petr. "Optimalizace přístupu do CDMA sítí." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-233541.

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The aim of this dissertation thesis is an optimization of access to CDMA networks. To be more specific, this thesis deals with an optimization of admission control in UMTS network. The first part of the thesis deals with the present progress of the particular topic. Thereinafter there is an analysis of admission control in UMTS system. An own UMTS simulation program was created in MATLAB. This program enables implementation and simulation of the selected admission control algorithms. The thesis is focused on load factor based, fuzzy logic based and genetic algorithms. The created UMTS simulato
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20

Baudais, Jean-Yves. "Étude des modulations à porteuses multiples et à spectre étalé : analyse et optimisation." Phd thesis, INSA de Rennes, 2001. http://tel.archives-ouvertes.fr/tel-00009214.

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Les systèmes numériques de communications connaissent un essor considérable sous l'impulsion d'une demande de plus en plus pressante de mobilité, de diversité des services et d'intégration des applications multimédia les plus récentes. Les recherches présentées dans ce mémoire de thèse ont pour but l'étude de nouveaux systèmes de communications qui pourront s'appliquer aussi bien aux systèmes de radiocommunications mobiles qu'aux systèmes de communications à l'intérieur des bâtiments. L'élément nouveau est ici la combinaison de deux techniques : l'étalement de spectre permettant la mise en oeu
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21

Qin, Qin. "Linear Prediction Approach for Blind Multiuser Detection in Multicarrier CDMA Systems." University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1034355893.

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22

Xiao, Lin. "CDMA Bus lane : cross-layer protocol for Qos routing in CDMA based mobile ad hoc networks." Thesis, Queen Mary, University of London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.498195.

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23

Alam, Fakhrul. "Simulation of Third Generation CDMA Systems." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/36387.

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The goal for the next generation of mobile communications system is to seamlessly integrate a wide variety of communication services such as high speed data, video and multimedia traffic as well as voice signals. The technology needed to tackle the challenges to make these services available is popularly known as the Third Generation (3G) Cellular Systems. One of the most promising approaches to 3G is to combine a Wideband Code Division Multiple Access (WCDMA) air interface with the fixed network of Global System for Mobile communications (GSM). In this thesis a signal simulator was implemente
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24

Rupf, Marcel. "Coding for CDMA channels and capacity /." Zürich, 1993. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=10398.

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25

Lundqvist, Henrik. "Error Correction Coding for Optical CDMA." Licentiate thesis, KTH, Microelectronics and Information Technology, IMIT, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1637.

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<p>The optical fiber is a very attractive communication mediumsince it offers a large bandwidth and low attenuation and cantherefore facilitate demanding services such as high-qualityvideo transmission. As the reach of optical fiber is beingextended to the access network it is economically attractive toshare fibers between different users without adding activecomponents in the network. The most common multiple accessmethod for such passive optical networks is time divisionmultiple access (TDMA), but lately there has been an increasedinterest in using wavelength division multiple access (WDMA)a
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26

Hakyemez, Serkan Ender. "Scheduling Algorithms For Wireless Cdma Networks." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12609050/index.pdf.

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In recent years the need for multimedia packet data services in wireless networks has grown rapidly. To overcome that need third generation (3G) mobile services have been proposed. The fast growing demands multimedia services in 3G services brought the need for higher capacity. As a result of this, the improvement on throughput, traffic serving performance has become necessary in 3G systems. Code division multiple access (CDMA) technique is one of the most important 3G wireless mobile techniques that has been defined. The scheduling mechanisms used in CDMA plays an important role on the effici
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27

Katz, M. (Marcos). "Code acquisition in advanced CDMA networks." Doctoral thesis, University of Oulu, 2002. http://urn.fi/urn:isbn:9514268849.

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Abstract The present dissertation deals with initial synchronization in Code Division Multiple Access (CDMA) networks. In the first part of this thesis an extensive and up-to-date review of the literature is presented. The basic theory of code acquisition as well as different techniques and structures used to achieve the initial synchronization are discussed. A survey of the most common theoretical approaches allowing performance characterization of the acquisition process is included. The effect of noise, interference, carrier Doppler, multipath propagation, fading and data modulation on sys
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28

Latva-aho, M. (Matti). "Advanced receivers for wideband CDMA systems." Doctoral thesis, University of Oulu, 1998. http://urn.fi/urn:isbn:9514250397.

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Abstract Advanced receiver structures capable of suppressing multiple-access interference in code-division multiple-access (CDMA) systems operating in frequency-selective fading channels are considered in this thesis. The aim of the thesis is to develop and validate novel receiver concepts suitable for future wideband cellular CDMA systems. Data detection and synchronization both for downlink and uplink receivers are studied. The linear minimum mean squared error (LMMSE) receivers are derived and analyzed in frequency-selective fading channels. Different versions of the LMMSE receivers are sh
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Ardebilipour, Mehrdad. "Acquisition techniques for mobile CDMA systems." Thesis, University of Surrey, 2000. http://epubs.surrey.ac.uk/843192/.

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The initial code Acquisition Techniques of Direct Sequence Spread Spectrum Systems for two categories of serial and parallel search strategies is investigated. A simple and economic scheme for coarse code acquisition of Reverse Link for UMTS (FDD-WCDMA) application is presented. The emphasis is on the performance of a new scheme (using a Surface Acoustic Wave Matched Filter) as a term of probability of false detection (pf) in code division multiple access (CDMA) systems. Knowledge of initial code uncertainty phases help to reduce the overhead of preamble on the access channel and a very simple
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Lim, Leycheoh. "Chip interleaving for CDMA cellular systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ29414.pdf.

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31

Li, Haiyan. "Power control in cellular CDMA systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0028/MQ27018.pdf.

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Wu, Xiao Wen. "Video transmission over wireless CDMA networks." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0026/MQ27027.pdf.

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33

Gao, Zhimin. "Radio location in urban CDMA macrocells." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0028/MQ51344.pdf.

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34

Lei, Sihong. "Capacity analysis for a CDMA system." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0025/MQ51740.pdf.

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35

Oyefuga, Oladipupo Olaseni. "Downlink optimisation for wideband CDMA systems." Thesis, Imperial College London, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414589.

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Huang, Li-Ke. "Space-time DS-CDMA communication systems." Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397681.

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Dimitriou, Nikos. "Call admission control for multimedia CDMA." Thesis, University of Surrey, 2000. http://epubs.surrey.ac.uk/930/.

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Dhomeja, Sheyam Lal. "CDMA communications over wireless infrared channels." Thesis, University of Southampton, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287004.

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Lee, Chin-Chun. "CDMA for cellular mobile radio systems." Thesis, University of Southampton, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240979.

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Oon, Tik bin. "Multiple access interference cancellation for CDMA." Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242678.

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Yan, Kai. "Genetic algorithm assisted CDMA multiuser detection." Thesis, University of Southampton, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343015.

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Shakya, Indu Lal. "High capacity CDMA and collaborative techniques." Thesis, University of Sussex, 2008. http://sro.sussex.ac.uk/id/eprint/7619/.

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The thesis investigates new approaches to increase the user capacity and improve the error performance of Code Division Multiple Access (CDMA) by employing adaptive interference cancellation and collaborative spreading and space diversity techniques. Collaborative Coding Multiple Access (CCMA) is also investigated as a separate technique and combined with CDMA. The advantages and shortcomings of CDMA and CCMA are analysed and new techniques for both the uplink and downlink are proposed and evaluated. Multiple access interference (MAI) problem in the uplink of CDMA is investigated first. The pr
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43

Mozaffaripour, M. "Multiuser detection for mobile CDMA systems." Thesis, University of Surrey, 2003. http://epubs.surrey.ac.uk/844233/.

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The goal for the third generation (3G) of mobile communications system is to seamlessly integrate a wide variety of communication services such as high-speed data, video and multimedia traffic as well as voice signals for transmission on a Wideband Code Division Multiple Access (WCDMA) air interface. CDMA suffers from interference and in this thesis multiuser detection for the mobile uplink has been considered. A thorough comparative study for different multiuser detection methods is done. RAKE-IC as an architecture for mixing the ideas of RAKE receiver, and parallel Interference Cancellation,
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44

Khanfouci, Mourad. "Séquences chaotiques pour les systèmes CDMA." Paris 11, 2005. http://www.theses.fr/2005PA112019.

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Nous nous sommes intéressés dans cette thèse au problème général de l'optimisation des performances d'un système de communication numérique, accès multiple par répartition des codes (CDMA) par un choix ou encore une synthèse des séquences d'étalement. Après avoir décrit brièvement les approches classiques, basées essentiellement des constructions dans le corps des symboles binaires ainsi qu'une optimisation des paramètres de corrélation maximaux associés, nous nous sommes concentrés sur des approches plus récentes, basées sur une minimisation des statistiques d'ordre 2 de l'interférence inter-
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45

Abdi, Moussa. "Détection multi-utilisateurs en mode CDMA." Paris, ENST, 2002. http://www.theses.fr/2002ENST0027.

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46

Phasouliotis, Antonis. "Multicarrier CDMA systems with MIMO technology." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/multicarrier-cdma-systems-with-mimo-technology(87853579-fae7-45cb-b243-abe731f2c786).html.

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The rapid demand for broadband wireless access with fast multimedia services initiated a vast research on the development of new wireless systems that will provide high spectral efficiencies and data rates. A potential candidate for future generation wireless systems is multi-carrier code division multiple access (MC-CDMA). To achieve higher user capacities and increase the system data rate, various multiple-input multiple-output (MIMO) technologies such as spatial multiplexing and spatial diversity techniques have been proposed recently and combined with MC-CDMA.This research proposes a chip
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47

Wu, Xiao Wen Carleton University Dissertation Engineering Systems and Computer. "Video transmission over wireless CDMA networks." Ottawa, 1997.

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Li, Haiyan Carleton University Dissertation Engineering Systems and Computer. "Power control in cellular CDMA systems." Ottawa, 1997.

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Agashe, Parag. "Selective cancellation of interference for CDMA." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-11182008-063200/.

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Abdi, Moussa. "Détection multi-utilisateurs en mode CDMA /." Paris : École nationale supérieure des télécommunications, 2003. http://catalogue.bnf.fr/ark:/12148/cb390325301.

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