Letteratura scientifica selezionata sul tema "Code division multiple access"

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Articoli di riviste sul tema "Code division multiple access"

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Shah, Jagdeep. "Optical Code Division Multiple Access". Optics and Photonics News 14, n. 4 (1 aprile 2003): 42. http://dx.doi.org/10.1364/opn.14.4.000042.

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Buehrer, R. Michael. "Code Division Multiple Access(CDMA)". Synthesis Lectures on Communications 1, n. 1 (gennaio 2006): 1–192. http://dx.doi.org/10.2200/s00017ed1v01y200508com002.

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Milstein, L. B. "Wideband code division multiple access". IEEE Journal on Selected Areas in Communications 18, n. 8 (agosto 2000): 1344–54. http://dx.doi.org/10.1109/49.864000.

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G, Narayana Gowda. "Chaotic Code Division Multiple Access". INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 08, n. 04 (2 aprile 2024): 1–5. http://dx.doi.org/10.55041/ijsrem29967.

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Chaotic signals are gaining importance in the field of communication these days. The chaotic Pseudo Noise sequences give a uniform spread over the entire frequency bandwidth. The sequences produce good performance as Pseudo random patterns when used in Code Division Multiple Access (CDMA) systems. This paper introduces to the field of chaotic signals and demonstrates how it is used in CDMA systems Key Words: Chaotic signals, DS CDMA, Nonlinear systems, PN sequences.
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Crespo, P. M., M. L. Honig e J. A. Salehi. "Spread-time code-division multiple access". IEEE Transactions on Communications 43, n. 6 (giugno 1995): 2139–48. http://dx.doi.org/10.1109/26.387455.

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Sampson, David D., Graeme J. Pendock e Robert A. Griffin. "Photonic code-division multiple-access communications". Fiber and Integrated Optics 16, n. 2 (gennaio 1997): 129–57. http://dx.doi.org/10.1080/01468039708202284.

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Wei Li, Wei Li. "Fiber Bragg grating sensing system based on code division multiple access". Chinese Optics Letters 11, s2 (2013): S20602–320604. http://dx.doi.org/10.3788/col201311.s20602.

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Kanj, Khalil, Ahmed K. Elhakeem e Tho Le-Ngoc. "Orthogonal short codes for code division multiple access networks". European Transactions on Telecommunications 7, n. 4 (luglio 1996): 297–304. http://dx.doi.org/10.1002/ett.4460070402.

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Martín-González, J. A., R. Pérez-Jiménez, F. J. López-Hernández, E. Poves e O. González. "Code acquisition of random optical codes in optical code-division multiple-access". IET Communications 6, n. 18 (18 dicembre 2012): 3176–88. http://dx.doi.org/10.1049/iet-com.2012.0305.

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Yang, Lie-Liang. "Time-Hopping Multicarrier Code-Division Multiple Access". IEEE Transactions on Vehicular Technology 56, n. 2 (marzo 2007): 731–41. http://dx.doi.org/10.1109/tvt.2006.889577.

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Tesi sul tema "Code division multiple access"

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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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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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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 two of these is made. The first of these one chip per carrier multi-carrier CDMA systems utilises the same number of carriers as the spreading sequence length. The carriers overlap and adjacent chips of the spreading sequence modulate adjacent carriers. There is no guard interval and therefore intercarrier interference occurs. If the receiver is synchronised and has a perfect estimate of the channel, it is shown that this multi-carrier CDMA system has comparable performance to a DS-CDMA system of the same bandwidth. It is further shown that it is simple to compute the minimum mean square error criteria as the equaliser consists of N one tap equalisers, where N is the number of carriers. The second system utilises many overlapping low data rate orthogonal carriers. The orthogonality of the carriers is maintained due to cyclically extended guard interval and the number of carriers is much higher than the spreading sequence length. After spreading, the data streams are interleaved onto the carriers to maximise diversity. A practical form of maximum likelihood detection for 64 users is described. It is shown from simulation results that when the system is used in conjunction with ½ rate (constraint length 7) coding and equal gain combining the system can support 64 users at 6 dB E6/N6 for a bit error rate of 2 x 10-3. This compares with an equivalent DS-CDMA system which can only support 16 users for the same bit error rate and E6/No. These results assume perfect channel knowledge and synchronisation. It is further shown that to provide high spectral efficiency in a coded system a high rate convolutional coding scheme is needed. A combined decoder/canceller is also presented. Finally, techniques to achieve synchronisation and channel estimation algorithms are presented. These algorithms are considered in conjunction with the second system. In the framework of synchronisation, methods are presented for frequency and timing synchronisation. For channel estimation, simulation results are presented for a simple channel estimator.
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Huynh, Jack, e 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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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 DSP processor called BBP1 and were thinking about adding W-CDMA support for it. Even though our system is not implemented on the BBP1 it should provide a good base for future implementations. This thesis project will describe the construction of a behavioural model of a W-CDMA system following the standard specified by 3GPP. The system simulates W-CDMA transmission and reception and has an optional channel used to simulate real world interference. The receiver uses a rake combiner to improve the performance of the system.

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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 encompasses the selection of components and demonstrates that the preliminary operational characteristics of a spread spectrum DPSK modem scheme for CDMA application can be achieved
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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 détecteur et le décodeur de canal. Grâce aux entrelaceurs et à ce traitement itératif à la réception, le système IDMA est capable de combattre efficacement les interférences d'accès multiple ainsi que les interférences entre symboles dans le cas des canaux multi-trajets. Dans un premier temps, nous avons pris en main cette technique innovante, puis validé les performances initialement publiées. Puis, nous avons complété cette étude par une analyse approfondie du fonctionnement du système IDMA basée, en particulier, sur l'étude des performances génie du récepteur et les diagrammes EXIT. Par ailleurs, comme la complexité calculatoire du récepteur augmente linéairement en fonction du nombre d'utilisateurs, du nombre d'itérations et du nombre de trajets, une grande partie de ce travail a été consacrée à l'étude du compromis entre les performances et la complexité d'un système IDMA. Nous avons donc proposé un système basé sur la technique IDMA ayant une complexité au niveau du récepteur indépendante du nombre de trajets. Il consiste à combiner le système IDMA avec la technique multi-porteuses OFDM. Une comparaison avec le système IDMA utilisant la technique d'annulation d'interférences entre symboles a montré que le système OFDM-IDMA proposé est performant en terme de taux d'erreurs binaires. De plus, la complexité calculatoire du récepteur est fortement réduite. Enfin, une étude du système OFDM-IDMA dans un contexte de communication sans fil réaliste nous a permis de considérer cette technique comme un candidat potentiel pour l'interface air de la 4G, sous la contrainte de la maîtrise de la complexité du récepteur. Pour ce faire, nous avons proposé des détecteurs simplifiés pour le récepteur IDMA, ayant des performances proches en terme de taux d'erreurs binaires de celles du récepteur initial. Une comparaison des performances et de la complexité, des détecteurs simplifies avec le détecteur original a montré que l'un des détecteurs proposés est pertinent pour une intégration matérielle d'un système à base de la technique IDMA. Enfin, des entrelaceurs adaptés à une possible réalisation matérielle ont été proposés pour remplacer les entrelaceurs aléatoires du système IDMA théorique
This thesis deals with a new multi-user technique: the Interleave Division Multiple Access (IDMA) proposed by Li Ping et al. , in 2002. This technique is a particular case of chip Interleaved Code Division Multiple Access (cI CDMA). The key principle of IDMA is that the chip interleavers are used for user separation. Moreover, the receiver is based on chip iterative detection, where a multiuser detector and decoders exchange extrinsic information in a turbo-like manner. IDMA systems are able to cancel the multi-user access interference and inter-symbol interference effectively, thanks to this iterative process and the user-specific interleavers. In this study, we first validate the performance presented initially by Li Ping et al. And then completed our study by a deep analysis of the IDMA principle. A major effort has been dedicated to the study of the trade-off between performance and complexity, since the complexity of the IDMA receiver in terms of number of operations increases with the number of users, the number of iterations and the number of paths. We have then proposed a new IDMA-based system in which receiver complexity is independent of the number of paths. This involves combining the IDMA technique with the multi-carriers modulation OFDM (Orthogonal Frequency Division Multiplexing). A comparison with the IDMA system based on the cancellation of inter-symbol interference has shown that the proposed OFDM-IDMA system improves the performance, in terms of binary error rate. Moreover, the receiver complexity, in terms of number of operations is greatly reduced. A study of the OFDM-IDMA system in the context of wireles communications allows us to consider this technique as a potential candidate for the air interface 4G. To do so, we have proposed a simplified detector for the IDMA receiver, whose performance in terms of binary error rate is closed to that of the original one. A comparison of performance and complexity with the original detector has shown that the proposed simplified detector is an interesting choice for the hardware implementation of an IDMA system. Finally, interleavers matched to hardware implementation have also been proposed as an alternative to the random interleavers of the theoretical IDMA system
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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 can generate more codes, enabling the full potential of Forward Error Correction (FEC). BCDD defines a new set of high weight antipodal codes with relaxed correlation constraints that is suitable for differential detection. These codes can support approximately twice as many users as the other previously published OCDMA systems. Using a system with 32 wavelengths and 16 time chips operating at OC-12 transmission rates (622Mbps), BCDD can support an aggregate throughput of approximately 136Gbps when proper FEC is applied.
Furthermore, studies on the information theoretical capacity of chip synchronous OCDMA channel with Single User Detection (SUD) is conducted to obtain the ultimate throughput that can be achieved. Calculations are done under three assumptions: (i) interference-limited channel, (ii) interference-limited channel with Gaussian noise; or (iii) Gaussian approximated interference channel. In additions, system specific DFSC and BCDD capacity is obtained. These results are used as the basis for comparison among DFSC, BCDD and other previously proposed OCDMA systems. It is found that the maximum throughput of an OCDMA system is limited to about 0.7 bits per OCDMA chip. With the application of turbo code, BCDD can support an aggregate throughput of about 0.42 bits per OCDMA chip.
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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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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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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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Libri sul tema "Code division multiple access"

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G, Glisic Savo, e Leppänen Pentti A, a cura di. Code division multiple access communications. Boston: Kluwer Academic Publishers, 1995.

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Buehrer, R. Michael. Code Division Multiple Access (CDMA). Cham: Springer International Publishing, 2006. http://dx.doi.org/10.1007/978-3-031-01673-8.

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Glisic, Savo G., e Pentti A. Leppänen, a cura di. Code Division Multiple Access Communications. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-2251-5.

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Glisic, Savo G. Code Division Multiple Access Communications. Boston, MA: Springer US, 1995.

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K, Elhakeem Ahmed, a cura di. Code division multiple access networks. New York: IEEE, 1994.

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K, Elhakeem Ahmed, a cura di. Code division multiple access networks III. New York: IEEE, 1996.

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Zigangirov, Kamil Sh. Theory of Code Division Multiple Access Communication. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2004. http://dx.doi.org/10.1002/047165549x.

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Kocakanat, Murat. A direct sequence - code division multiple access. Monterey, Calif: Naval Postgraduate School, 1997.

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Zigangirov, K. Sh. Theory of code division multiple access communication. Piscataway, NJ: IEEE Press, 2004.

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Kara, Önder. A direct sequence - code division multiple access. Monterey, Calif: Naval Postgraduate School, 1997.

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Capitoli di libri sul tema "Code division multiple access"

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Gagliardi, Robert M. "Code-Division Multiple Access". In Satellite Communications, 289–335. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-010-9760-4_7.

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Torrieri, Don. "Code-Division Multiple Access". In Principles of Spread-Spectrum Communication Systems, 437–508. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70569-9_7.

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Stüber, Gordon L. "Code Division Multiple Access". In Principles of Mobile Communication, 409–65. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4757-6268-6_8.

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Torrieri, Don. "Code-Division Multiple Access". In Principles of Spread-Spectrum Communication Systems, 365–463. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-9595-7_6.

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Springer, Andreas, e Robert Weigel. "Code Division Multiple Access". In UMTS, 73–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-04937-2_4.

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Torrieri, Don. "Code-Division Multiple Access". In Principles of Spread-Spectrum Communication Systems, 421–87. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75343-6_7.

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Buehrer, R. Michael. "Cellular Code Division Multiple Access". In Code Division Multiple Access (CDMA), 73–110. Cham: Springer International Publishing, 2006. http://dx.doi.org/10.1007/978-3-031-01673-8_3.

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Faruque, Saleh. "Code Division Multiple Access (CDMA)". In Radio Frequency Multiple Access Techniques Made Easy, 45–62. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-91651-4_5.

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Fitzek, Frank H. P., e Marcos Katz. "Code Division Multiple Access (CDMA)". In Handbook of Computer Networks, 751–68. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118256114.ch48.

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Scholtz, Robert A. "The Evolution of Spread-Spectrum Multiple-Access Communications". In Code Division Multiple Access Communications, 3–26. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-2251-5_1.

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Atti di convegni sul tema "Code division multiple access"

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Weiner, A. M., C. C. Chang e H. P. Sardesai. "Femtosecond Optical Code-Division Multiple-Access". In Ultrafast Electronics and Optoelectronics. Washington, D.C.: OSA, 1997. http://dx.doi.org/10.1364/ueo.1997.ub4.

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Andonovic, Ivan, e Wei Huang. "Optical code-division multiple-access networks". In International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '98, a cura di Anurag Sharma, Banshi D. Gupta e Ajoy K. Ghatak. SPIE, 1999. http://dx.doi.org/10.1117/12.347958.

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Samra, A. S., e H. A. Harb. "A new coded optical code division multiple access (OCDMA) systems". In Proceedings of the Twentieth National Radio Science Conference (NRSC'2003). IEEE, 2003. http://dx.doi.org/10.1109/nrsc.2003.157341.

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"Optical code division multiple access: Applications & devices". In 2009 IEEE/LEOS Summer Topical Meeting (LEOSST). IEEE, 2009. http://dx.doi.org/10.1109/leosst.2009.5226280.

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Chen, Lawrence R. "Optical Code-Division Multiple Access: Challenges and Solutions". In IC02, a cura di Roger A. Lessard, George A. Lampropoulos e Gregory W. Schinn. SPIE, 2003. http://dx.doi.org/10.1117/12.473977.

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Bo-Min Seo, Junho Cho, Kweon Son e Ho-Shin Cho. "Design for underwater code division multiple access transceiver". In 2013 MTS/IEEE OCEANS. IEEE, 2013. http://dx.doi.org/10.1109/oceans-bergen.2013.6608066.

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Kwong, Wing C., Paul R. Prucnal e Yanming Liu. "Ultrafast all-optical code-division multiple-access networks". In Fibers '92, a cura di Leonid G. Kazovsky e Karen Liu. SPIE, 1992. http://dx.doi.org/10.1117/12.139302.

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Mahmmoud, Walid A., Ali A. Ali e Saad N. Abdul Majed. "Wavelet based multi carrier code division multiple access". In 2008 5th International Multi-Conference on Systems, Signals and Devices (SSD). IEEE, 2008. http://dx.doi.org/10.1109/ssd.2008.4632826.

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Mishra, Sanjay Kumar. "Developments in optical code division multiple access (OCDMA)". In INSTRUMENTATION ENGINEERING, ELECTRONICS AND TELECOMMUNICATIONS – 2021 (IEET-2021): Proceedings of the VII International Forum. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0100854.

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Yang, X., Y. Mo, W. Jiang e D. Li. "Analysis of Overlapped Code Division Multiple Access System in Gaussian Multiple Access Channel". In 2008 IEEE International Conference on Communications. IEEE, 2008. http://dx.doi.org/10.1109/icc.2008.240.

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Rapporti di organizzazioni sul tema "Code division multiple access"

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Torrieri, Don. Spread-Spectrum Code-Division Multiple Access. Fort Belvoir, VA: Defense Technical Information Center, luglio 2002. http://dx.doi.org/10.21236/ada406506.

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Irizarry, Alfredo V. Average Likelihood Methods for Code Division Multiple Access (CDMA). Fort Belvoir, VA: Defense Technical Information Center, maggio 2014. http://dx.doi.org/10.21236/ada603961.

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Irizarry, Alfredo V. Average Likelihood Methods of Classification of Code Division Multiple Access (CDMA). Fort Belvoir, VA: Defense Technical Information Center, maggio 2016. http://dx.doi.org/10.21236/ad1009582.

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Han, I., S. Bond, R. Welty, Y. Du, S. Yoo, C. Reinhardt, E. Behymer, V. Sperry e N. Kobayashi. Secure Communications in High Speed Fiber Optical Networks Using Code Division Multiple Access (CDMA) Transmission. Office of Scientific and Technical Information (OSTI), febbraio 2004. http://dx.doi.org/10.2172/15013953.

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Wieselthier, Jeffrey E., Anthony Ephremides e Julie A. Tarr. A Distributed Reservation-Based CDMA (Code Division Multiple Access) Protocol That Does Not Require Feedback Information. Fort Belvoir, VA: Defense Technical Information Center, giugno 1987. http://dx.doi.org/10.21236/ada183695.

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Irizarry, Alfredo V. Development of the Average Likelihood Function for Code Division Multiple Access (CDMA) Using BPSK and QPSK Symbols. Fort Belvoir, VA: Defense Technical Information Center, gennaio 2015. http://dx.doi.org/10.21236/ada619004.

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Tarr, J. A., J. E. Wieselthier e A. Ephremides. Packet-Error Probability Analysis for Unslotted FH-CDMA (Frequency Hopped-Code-Division Multiple-Access) Systems with Error Control Coding. Fort Belvoir, VA: Defense Technical Information Center, aprile 1989. http://dx.doi.org/10.21236/ada207964.

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Kazovsky, Leonid G., Ian White, Matt Rogge, Kapil Shrikhande e Erie Hu. Internet Protocol-Hybrid Opto-Electronic Ring Network (IP-HORNET): A Novel Internet Protocol-Over-Wavelength Division Multiplexing (IP-Over-WDM) Multiple-Access Metropolitan Area Network (MAN). Fort Belvoir, VA: Defense Technical Information Center, aprile 2003. http://dx.doi.org/10.21236/ada415560.

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СИСТЕМА ОЦЕНКИ ЭНЕРГОЭФЕКТИВНОСТИ СИНХРОНИЗИРОВАННОГО ДОСТУПА В ИМИТАЦИОННОЙ МОДЕЛИ БЕСПРОВОДНОЙ СЕНСОРНОЙ СЕТИ. С. В. Капустин, Р. Ф. Халабия, aprile 2020. http://dx.doi.org/10.33236/2307-910x-2020-1-29-35-39.

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Abstract (sommario):
В статье исследуются энергоэффективность узлов в структуре имитационной модели синхронизированного доступа беспроводной сенсорной сети, приводятся обоснования и доказательства применения имитационного моделирования на основе метода Time Division Multiple Access (TDMA), для оценки надежности используется алгоритм определения пути f узла к базовой станции в нижней границе оценки стабильности. Основной задачей исследуемого синхронизированного доступа канального уровня является настройка временных параметров протокола. Предложенная имитационная модель исправляет дефекты спецификации сети и производит оценку объема в момент передачи и за единицу времени на раннем этапе настройки архитектуры сети. Основное преимущество имитационной модели заключается в высокой энергоэффективности беспроводных сенсорных узлов при развертывании беспроводной сенсорной сети.
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