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Dissertations / Theses on the topic 'Code division multiple access'

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Published: 4 June 2021

Last updated: 25 July 2025

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1

Brown, Trevor Junior. "Time division multiple access/code division multiple access for the optical local access network." Thesis, Manchester Metropolitan University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243716.

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2

Choi, Byoung Jo. "Multi-carrier code division multiple access." Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394098.

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3

Stirling-Gallacher, Richard. "Multi-carrier code division multiple access." Thesis, University of Edinburgh, 1997. http://hdl.handle.net/1842/13027.

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The topic of this thesis is the use of multi-carrier modulation with code division multiple access (CDMA). The motivation of this work is to establish if the combination of multi-carrier modulation with CDMA has a performance advantage over a conventional direct sequence CDMA (DS-CDMA) communication system. In this thesis three types of multi-carrier CDMA are identified and the main work is concentrated on one particular combination, which is referred to as one chip per carrier multi-carrier CDMA system. This system itself, however can be split into different variations and an examination of t

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4

Huynh, Jack, and Mattias Gylin. "Modelering av Wideband : Code Division Multiple Access." Thesis, Linköping University, Department of Electrical Engineering, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2845.

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<p>Today wireless transmission of data is becoming more and more popular and the need for faster transmission rates is increasing. Since the bandwidth is limited it is important to try to use it to the fullest. CDMA is a technology that allows multiple accesses on the same frequency and time thus making it very bandwidth efficient. The CDMA technology was first introduced in the second generation’s cellular systems but has since then been improved and is reused in today’s 3G systems as Wideband CDMA. ISY is interested in getting a behavioural model of a W-CDMA system since they had developed a

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5

Kara, Önder. "A direct sequence - code division multiple access." Monterey, California. Naval Postgraduate School, 1997. http://hdl.handle.net/10945/8269.

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The development of a differential phase-shift keying (DPSK), direct sequence, spread spectrum modem is conducted for the purpose of creating a prototype design to be implemented in a multi-user environment. In this design, a maximal length sequence of 31 chips is used to spread the information data. The multi-user performance analysis is performed by using Bit Error Rate (BER) test equipment (1645 Hewlett Packard data error analyzer). A multi-user interference cancellation circuit for two users is introduced, and measurements are performed to show its effectiveness. The design itself encompass

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6

Mahafeno, Irène Masinjara. "Étude de la technique d'accès multiple IDMA (Interleave Division Multiple Access)." Télécom Bretagne, 2007. http://www.theses.fr/2007TELB0039.

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Cette thèse traite d'une nouvelle technique de communication multi-utilisateurs baptisée IDMA (Interleave Division Multiple Access). Cette technique, proposée en 2002 par Li Ping et al. S'avère être un cas particulier de la technique d'accès multiple CDMA à entrelacement chips. La principale caractéristique de la technique IDMA est l'utilisation d entrelaceurs pour la séparation des signaux des différents utilisateurs. Le système utilise un récepteur basé sur le principe Turbo, qui permet de supprimer itérativement les interférences multi-utilisateurs grâce à un échange d'informations entre le

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7

Yim, Raymond 1978. "New approaches to optical code-division multiple access." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29551.

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This thesis focuses on new strategies of designing Optical Code-Division Multiple Access (OCDMA) networks. Specifically, two new spreading code families of 2-dimensional (2D) wavelength-time system are considered: Depth-First Search Codes (DFSC) and Balanced Codes for Differential Detection (BCDD). DFSC utilizes a depth-first search algorithm to generate unipodal codes with maximum unit auto- and cross-correlation properties that are suitable for direct detection. These codes have similar interference-limited bit error rate (BER) performance as most 2D wavelength-time codes, but the algorithm

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8

Crockett, Louise H. "On code division multiple access applied to SpeckNets." Thesis, University of Strathclyde, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501845.

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9

Tarköy, Felix Niklaus. "A pragmatic approach to code-division multiple-access communications /." Zürich, 1994. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=10820.

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10

De, Gaudenzi Riccardo. "Code division multiple access for satellite personal communication systems /." Noordwijk : ESA, 1999. http://www.gbv.de/dms/goettingen/303779977.pdf.

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11

Haji, Mohsin. "Optical code division multiple access systems in AlGaInAs/InP." Thesis, University of Glasgow, 2012. http://theses.gla.ac.uk/3515/.

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The rise of photonic integration makes optical code division multiple access (OCDMA) worth revisiting due to its promising role in future all-optical networks. OCDMA has the potential to exploit the surplus bandwidth of optical fibres and to carry over to the optical domain the benefits seen CDMA radio communication systems, such as the effective sharing of the spectrum for multiple network subscribers, and resistance to jamming and eavesdropping. One of the major requirements for the deployment of OCDMA in networks is integration. This thesis presents a research study of integrated OCDMA syst

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12

Muayyadi, Ali. "Wavelet-based multi-carrier code division multiple access systems." Thesis, University of Plymouth, 2003. http://hdl.handle.net/10026.1/527.

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13

Shamain, Durgaprasad K. "Capacity enhancing techniques for code division multiple access systems /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2001. http://wwwlib.umi.com/cr/ucsd/fullcit?p3029654.

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14

Wysocki, Beata J. "Signal formats for code division multiple access wireless networks." Thesis, Curtin University, 1999. http://hdl.handle.net/20.500.11937/478.

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One of the fundamental problems related to the development of direct sequence code division multiple access (DS CDMA) wireless data networks is design of spreading sequences possessing semi-optimal characteristics. In this thesis, we introduce three new methods to design spreading sequences, which can be optimised to achieve the desired characteristics.We show that the level of MAI for the DS CDMA systems utilising the example sets of sequences designed by the use of these techniques can be relatively low, compare to the case when the well known Gold-like sequences [29] are used. In addition,

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15

Wysocki, Beata J. "Signal formats for code division multiple access wireless networks." Curtin University of Technology, Australian Telecommunications Research Institute, 1999. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=10408.

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One of the fundamental problems related to the development of direct sequence code division multiple access (DS CDMA) wireless data networks is design of spreading sequences possessing semi-optimal characteristics. In this thesis, we introduce three new methods to design spreading sequences, which can be optimised to achieve the desired characteristics.We show that the level of MAI for the DS CDMA systems utilising the example sets of sequences designed by the use of these techniques can be relatively low, compare to the case when the well known Gold-like sequences [29] are used. In addition,

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16

Ward, Richard Peter. "Evolution of loosely synchronized spreading codes in code-division multiple-access systems." Thesis, University of South Wales, 2008. https://pure.southwales.ac.uk/en/studentthesis/evolution-of-loosely-synchronized-spreading-codes-in-codedivision-multipleaccess-systems(2bf79128-319c-49c1-8246-91ee0d3533c4).html.

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Loosely Synchronized (LS) codes can be used as spreading codes in quasi synchronous code-division multiple-access (QS-CDMA) systems. In such CDMA systems, close control of synchronization is achieved at the chip level, interme diate between that in synchronous CDMA and that in asynchronous CDMA. The LS code can then capitalize on zero correlation in a limited synchronization window to reduce code correlations and so reduce interference. LS codes are {O, +1, -1} codes constructed using Hadamard matrices and Golay pairs. A variation of LS codes inserts short strings of zeros between the compon

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17

Thakur, Anuja. "Outside cell interference dynamics in cellular code division multiple access." Ohio : Ohio University, 2003. http://www.ohiolink.edu/etd/view.cgi?ohiou1071070073.

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18

Irmer, Ralf. "Multiuser Transmission in Code Division Multiple Access Mobile Communications Systems." Doctoral thesis, Aachen : Shaker, 2005. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=013194664&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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19

Abedi, Saied. "Genetic multi-user detection for code division multiple access systems." Thesis, University of Surrey, 2000. http://epubs.surrey.ac.uk/843016/.

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The origins of spread spectrum are in navigation and military systems. Techniques originally developed to reduce the effects of the intentional jamming also proved suitable for communications through dispersive channels in cellular applications. In 1949 the first time hoping spread spectrum multiple access system has been introduced by John Pierce. A direct-sequence spread spectrum system has been proposed by De Rosa-Rogoff later in 1950. He has also introduced the concept of processing gain. However the commercialisation of cellular direct-sequence code division multiple access (DS-CDMA) syst

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20

Sunay, M. Oguz. "Performance analysis of direct sequence code division multiple access systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0014/NQ52848.pdf.

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21

Zhang, Yifeng. "Wavelet packet based multicarrier modulation code division multiple access system." Ohio : Ohio University, 2000. http://www.ohiolink.edu/etd/view.cgi?ohiou1179861748.

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22

Saur, Stephan. "Channel estimation for mobile wideband code division multiple access (WCDMA)." Aachen Shaker, 2008. http://d-nb.info/989680819/04.

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23

RAO, THUMATI VENKATA. "DATA PROCESSING DESIGN OF WIDEBAND CODE DIVISION MULTIPLE ACCESS (WCDMA)." Thesis, Blekinge Tekniska Högskola, Avdelningen för signalbehandling, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-1318.

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Wideband Direct-Sequence Code Division Multiple Access (W-CDMA) is the emerging protocol for the next generation (3G) wireless communication systems. W-CDMA has been designed to add features such as multimedia capabilities, high data rates and multi-rate services to the existing wireless communication framework. Several standards for third generation systems have been proposed and developed by different industrial committees in countries such as the U.S, Europe and Japan. All these standards have accepted CDMA in one form or another as the multiple access method for wireless communications req

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24

Dai, Bo. "Optical code-division multiple access system and optical signal processing." Thesis, Heriot-Watt University, 2013. http://hdl.handle.net/10399/2663.

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This thesis presents our recent researches on the development of coding devices, the investigation of security and the design of systems in the optical cod-division multiple access (OCDMA) systems. Besides, the techniques of nonlinear signal processing used in the OCDMA systems fire our imagination, thus some researches on all-optical signal processing are carried out and also summarized in this thesis. Two fiber Bragg grating (FBG) based coding devices are proposed. The first coding device is a superstructured FBG (SSFBG) using ±π/2-phase shifts instead of conventional 0/π-phase shifts. The ±

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25

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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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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26

Irmer, Ralf. "Multiuser Transmission in Code Division Multiple Access Mobile Communications Systems." Doctoral thesis, Technische Universität Dresden, 2004. https://tud.qucosa.de/id/qucosa%3A24546.

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Code Division Multiple Access (CDMA) is the technology used in all third generation cellular communications networks, and it is a promising candidate for the definition of fourth generation standards. The wireless mobile channel is usually frequency-selective causing interference among the users in one CDMA cell. Multiuser Transmission (MUT) algorithms for the downlink can increase the number of supportable users per cell, or decrease the necessary transmit power to guarantee a certain quality-of-service. Transmitter-based algorithms exploiting the channel knowledge in the transmitter are also

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27

Thakur, Anuja. "Outside cell Interference Computations for Cellular Code Division Multiple Access." Ohio University / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1071070073.

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28

YUE, XIAODONG. "NEAR-FAR RESISTANCE IN CODE DIVISION MULTIPLE ACCESS COMMUNICATION SYSTEMS." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1083253130.

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29

Stokes, Andrew J. "Interferometric Synthetic Aperture Ladar Using Code Division Multiple Access Apertures." University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1511789594365428.

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30

Ong, Chong Tean. "Asynchronous hopping and code diversity in frequency-hopped code division multiple access systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq25130.pdf.

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31

Kalgaonkar, Kaustubh. "Pilot symbol design for multiuser CDMA systems." Diss., Columbia, Mo. : University of Missouri-Columbia, 2004. http://hdl.handle.net/10355/5809.

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Thesis (M.A.)--University of Missouri-Columbia, 2004.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (June 30, 2006) Vita. Includes bibliographical references.

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32

謝正學 and Ching-hok Tse. "A digital-implementation technique for a new multitone code-division-multiple-access system." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31226784.

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33

虞愛 and Ai Yu. "A study of power control in CDMA overlay." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31241293.

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34

Altınsoy, Eşref Olgu Altınkaya Mustafa Aziz. "Multiuser Detection in CDMA Using Blind Techniques/." [s.l.]: [s.n.], 2004. http://library.iyte.edu.tr/tezler/master/elektrikveelektronikmuh/T000459.pdf.

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35

Karagiannis, Ioannis. "Development of a Nakagami-Lognormal Model for a cellular CDMA forward." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://sirsi.nps.navy.mil/uhtbin/hyperion-image/02Mar%5FKaragiannis.pdf.

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36

Klitorakis, Petros. "On the capacity of a cellular CDMA system reverse channel." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://sirsi.nps.navy.mil/uhtbin/hyperion-image/02Mar%5FKlitorakis.pdf.

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37

Prahatheesan, Vicknarajah. "A lattice filter for CDMA overlay." Thesis, Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B20665684.

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38

Yu, Ai. "A study of power control in CDMA overlay /." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22926033.

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39

Tse, Ching-hok. "A digital-implementation technique for a new multitone code-division-multiple-access system /." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25100774.

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40

Zhang, Xi, and 張曦. "Multiple access capacity for multitone CDMA systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B31227089.

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41

Zhang, Xi. "Multiple access capacity for multitone CDMA systems /." Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B24872684.

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42

McKown, Kenneth J. "Implementation of a fiber-optic code-division multiple access data link." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA303225.

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43

Yuvapoositanon, Peerapol. "Blind adaptive algorithms for direct-sequence code division multiple access receivers." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271955.

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44

Brooks, Stephen A. "Analysis of large area synchronous code-division multiple access (LAS-CDMA)." Thesis, Monterey, California. Naval Postgraduate School, 2002. http://hdl.handle.net/10945/5958.

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Large area synchronous code-division multiple access (LAS-CDMA) is a proposed fourth generation cellular standard. Similar to cdma2000, the distinguishing feature of LAS-CDMA is the new set of spreading codes used to separate users in the wireless channel. This thesis examines the properties of the new spreading codes. Unlike Walsh functions, which are orthogonal only when perfectly synchronized, LAS-CDMA spreading codes are orthogonal when synchronized within a nine-chip interference-free time window. The interference-free time window allows LAS-CDMA to transmit the forward link and reverse l

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45

Purle, David J. "Frequency hopped code division multiple access techniques for future wireless communications." Thesis, University of Bristol, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.281833.

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46

Zoualfaghari, Mohammad Hossein. "Co-channel interference reduction in Optical Code Division Multiple Access systems." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/5819/.

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In this thesis few new code sets and a multi-user interference (MUI) cancellation scheme have been proposed for Optical Code Division Multiple Access (OCDMA) systems, which can be employed in the next generation of global communication networks to enhance their existing systems’ performance dramatically. The initial evaluation of the proposed code sets shows that their implementation improves the performance, decreases the BER and increases security considerably. Also the proposed MUI cancellation scheme totally removes all the cross-talk and interference between the active users within the ne

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47

Band, Ian W. "Multi-user receiver structures for direct sequence code division multiple access." Thesis, University of Edinburgh, 1998. http://hdl.handle.net/1842/10722.

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This thesis reports on an investigation of various system architectures and receiver structures for cellular communications systems which discriminate users by direct sequence code division multiple access (DS-CDMA). Attention is focussed on the downlink of such a spread spectrum system and the influence of a number of design parameters is considered. The objective of the thesis is to investigate signal processing techniques which may be employed either at the receiver, or throughout the system to improve the overall capacity. The principles of spread spectrum communication are first outlined,

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48

Pearce, Richard Sargon. "Some aspects of a code division multiple access local area network." Thesis, Durham University, 1987. http://etheses.dur.ac.uk/6810/.

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49

Mizusawa, George A. "Performance of Hyperbolic Position Location Techniques for Code Division Multiple Access." Thesis, Virginia Tech, 1996. http://hdl.handle.net/10919/30542.

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The Federal Communications Commission (FCC) recently adopted rules requiring cellular telephone, Personal Communication System (PCS) and Specialized Mobile Radio (SMR) licensees to provide two dimensional automatic location information (ALI) for a user requesting E-911 service. These wireless service providers will need to utilize effective position location (PL) technology in order to meet FCC rules. Hyperbolic PL systems are one such technology that can provide accurate PL information using the existing cellular/PCS infrastructure and without requiring additional hardware/software implementa

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50

Deepak, Virat. "Partitioned Reduced Complexity Multiuser Detectors For Code Division Multiple Access Systems." Ohio University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1127143401.

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