Academic literature on the topic 'CDMA Optique'
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Journal articles on the topic "CDMA Optique"
T, Jaya, M. Monisha, M. Meena, and C. Sharanya. "Improvement of bit error rate performance of MC-CDMA system by using adaptive digital modulation schemes." International Journal of Engineering & Technology 7, no. 3.3 (June 8, 2018): 663. http://dx.doi.org/10.14419/ijet.v7i2.33.14863.
Full textAZMI, PAEIZ. "MULTIUSER INTERFERENCE SUPPRESSION TECHNIQUES FOR DIRECT-SEQUENCE CDMA COMMUNICATION SYSTEMS." Fluctuation and Noise Letters 08, no. 03n04 (December 2008): L323—L332. http://dx.doi.org/10.1142/s0219477508005094.
Full textBernstein, X., and A. M. Haimovich. "Space-time optimum combining for CDMA communications." Wireless Personal Communications 3, no. 1-2 (1996): 73–89. http://dx.doi.org/10.1007/bf00333924.
Full textN. Motade, Sumitra, and Anju V. Kulkarni. "Incremental gradient algorithm for multiuser detection in multi-carrier DS-CDMA system under modulation schemes." International Journal of Engineering & Technology 7, no. 2.6 (March 11, 2018): 311. http://dx.doi.org/10.14419/ijet.v7i2.6.11270.
Full textMooranian, Armin, Thomas Foster, Corina M. Ionescu, Daniel Walker, Melissa Jones, Susbin Raj Wagle, Bozica Kovacevic, et al. "Enhanced Bilosomal Properties Resulted in Optimum Pharmacological Effects by Increased Acidification Pathways." Pharmaceutics 13, no. 8 (July 31, 2021): 1184. http://dx.doi.org/10.3390/pharmaceutics13081184.
Full textVerdu, S., and D. N. C. Tse. "Optimum asymptotic multiuser efficiency of randomly spread CDMA." IEEE Transactions on Information Theory 46, no. 7 (2000): 2718–22. http://dx.doi.org/10.1109/18.887887.
Full textLei Wei and R. Jana. "Performance bounds for optimum multiuser DS-CDMA systems." IEEE Transactions on Communications 47, no. 2 (1999): 185–90. http://dx.doi.org/10.1109/26.752122.
Full textKumar, Arun, and Dr Manisha Gupta. "COMPARATIVE STUDY AND ANALYSIS OF BER OF CDMA FOR DIFFERENT MODULATION SCHEME." INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY 12, no. 8 (March 4, 2014): 3839–43. http://dx.doi.org/10.24297/ijct.v12i8.3013.
Full textSedaghat, Mohammad Ali, Ralf R. Muller, and Farokh Marvasti. "On Optimum Asymptotic Multiuser Efficiency of Randomly Spread CDMA." IEEE Transactions on Information Theory 61, no. 12 (December 2015): 6635–42. http://dx.doi.org/10.1109/tit.2015.2482483.
Full textKaya, O., and S. Ulukus. "Ergodic Sum Capacity Maximization for CDMA: Optimum Resource Allocation." IEEE Transactions on Information Theory 51, no. 5 (May 2005): 1831–36. http://dx.doi.org/10.1109/tit.2005.846413.
Full textDissertations / Theses on the topic "CDMA Optique"
Lourdiane, Mounia. "CDMA à séquence directe appliqué aux systèmes de communications optiques." Phd thesis, Télécom ParisTech, 2005. http://pastel.archives-ouvertes.fr/pastel-00001398.
Full textRuchet, Bernard. "Réalisation expérimentale d'une détection cohérente pour un système optique CDMA/FDMA." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0025/MQ31791.pdf.
Full textSaad, Naufal M. "Contribution à l'étude de l'application de la technique CDMA aux systèmes de transmission optique." Limoges, 2005. http://aurore.unilim.fr/theses/nxfile/default/5947cba4-5b56-41fa-a64c-296538fd14c0/blobholder:0/2005LIMO0007.pdf.
Full textOptical Code Division Multiple Access (OCDMA), adapted from the cellular phone network appeared from several years as a multiple access solution for high-speed Local Area Fibre-Optic Networks. This technique consists in assigning to each user a specific code providing an asynchronous and simultaneous access to several users. In this work, we study an incoherent optical CDMA system with time data spreading. In such systems, the incoherent optical signal processing uses unipolar quasi-orthogonal codes and the performances can be significantly reduced by Multiple Access Interference (MAI) as the number of active users increases. Different receivers are studied in order to mitigate the MAI, in particular a serial cancellation receiver. The theoretical error probabilities of each structure are established. One of the main issues of this work is the use of a system simulation software called COMSIS, which permits us to take into account the optical signal processing and the limitations introduced by all the electronic, opto-electronic and optical devices. This study provides a theoretical background for future studies on realistic applications of OCDMA to access network
Laflamme, Jean-Philippe. "Suppression de l'interférence d'accès multiple dans un réseau CDMA optique par égalisation fractionnée." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0003/MQ44707.pdf.
Full textZouine, Younes. "Contribution par la simulation système à l'étude des contraintes des composants optoélectroniques sur la transmission optique utilisant la technique CDMA." Limoges, 2005. http://aurore.unilim.fr/theses/nxfile/default/a2542528-1671-45c8-9ce8-76ef441c7766/blobholder:0/2005LIMO0059.pdf.
Full textThe CDMA technique (Code Division Multiple Access) is widely used in the radio cellular networks (3G). In the recent years, there has been a tendency towards the use of this technique in fibre-optic multiple access networks. This is mainly because of the large available bandwidth of the optical fibre. Associated with DWDM, this technique would indeed allow a significant increase in the number of users in the local area network without increasing in the number of fibres in the core network. It would be accompanied by a drastic cost decrease of the bit/km. This type of study is governed by the constraints bound to signal processing and the component performances. The research reported in this thesis, consists in an investigation through system simulations including the imposed constrains of the components and optoelectronic functions in response of the needs in local optical network architectures using CDMA applications. The limitations due to emission and reception blocks have been specially studied (laser + modulator, photodiodes, associated high speed electronics,…). In addition, the specific properties of optical fibre (dispersion, attenuation) has been considered in the particular case of optical access local network
Gatti, Sylvain. "Inscription laser UV pulsé sur nouveau matériau hybride pour codeurs optiques intégrés." Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2007. http://tel.archives-ouvertes.fr/tel-00258256.
Full textLa technologie sol-gel a déjà démontré son potentiel. Un nouveau matériau sol-gel hybride à polymérisation cationique de type Epoxy a été développé dans le but de la simplification de la synthèse et de l'amélioration des performances en particulier l'adhérence.
Ce travail a pour objectif le développement d'un banc d'écriture laser UV dans une couche Epoxy et l'établissement du protocole de fabrication associé. Ce procédé de polymérisation locale est une alternative prometteuse aux techniques lithographiques par masque.
Ce nouveau banc utilise un laser pulsé travaillant à faible longueur d'onde pour une meilleure résolution et une meilleure polymérisation.
Ce travail a montré la faisabilité de circuits complexes de type multiplexeurs WDM avec un procédé d'inscription à faible coût. Nous avons réalisé les premiers prototypes de circuits dédiés à la sélection multiple de longueurs d'onde pour le (dé)codage du CDMA optique spectral.
Chevalier, Ludovic. "Performances de l'optique sans fil pour les réseaux de capteurs corporels." Thesis, Limoges, 2015. http://www.theses.fr/2015LIMO0118/document.
Full textThis thesis deals with the performance of optical girelles communications for body area networks (BAN) as an alternative solution to the radiofrequency one, in the context of mobile healthcare monitoring. After presenting the main characteristics of a BAN using the radiofrequency technology, specifically in the UWB band, we explain the advantages of the optical wireless technology. Diffuse propagation based on infrared technology is then considered for BAN, exploiting optical reflections from environment surfaces. Several optical wireless channel modeling methods are introduced, and we consider two solutions for the link between two on-body nodes: a classical method named “one reflection model”, used to estimate performance variations, and a ray-launching method, used to take into account a great amount of optical reflections. Considering several scenarios, we determine the outage probability, and show that the diffuse optical wireless technology is able to achieve an on-body link, with the data rates and the quality of service required by health monitoring applications, for a transmitted power far lower than the limit defined in standards. Then, we evaluate the theoretical performance, in terms of error probability, of an optical wireless BAN, considering the optical code division multiple access technique. Finally, we show that a BAN using optical wireless technology is theoretically feasible, regarding a health monitoring application, and considering the mobility of the patient in indoor environment
Lourdiane, Mounia. "CDMA à séquence directe appliqué aux systèmes de communications optiques /." Paris : École nationale supérieure des télécommunications, 2005. http://catalogue.bnf.fr/ark:/12148/cb40079294t.
Full textGoursaud-Brugeaud, Claire. "Réception multiutilisateurs par annulation parallèle d'interférences dans les systèmes CDMA optiques." Limoges, 2006. http://aurore.unilim.fr/theses/nxfile/default/da3ed647-bbdc-44b8-859d-4705756c4ab2/blobholder:0/2006LIMO0023.pdf.
Full textThe multiple access technique CDMA (Code Division Multiple Access), based on the allocation to each user of a specific and distinct code, is studied for application to high-speed optical communications (OCDMA (Optical CDMA)). The main degradation causes are Multiple Access Interference due to the codes unipolarity, and the optical channel limitations (noise, chromatic dispersion …). In this thesis, several multi-user receivers (SIC (Serial Interference Cancellation) and PIC (Parallel Interference Cancellation)) have been studied theoretically and by simulation. The most studied structure is the PIC, which does not need much time of computation, and is simple to implement. Moreover, the chromatic dispersion impact, and the noise impact have been evaluated
Vrzic, Sophie. "Optimum capacity with linear power assignment for multimedia CDMA networks." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ61027.pdf.
Full textBooks on the topic "CDMA Optique"
Albeanu, Nicolae. Near-optimum lienar iterative interference cancellation in CDMA. 2002, 2002.
Find full textBook chapters on the topic "CDMA Optique"
Sarwate, Dilip V. "Optimum PN Sequences for CDMA Systems." In Code Division Multiple Access Communications, 53–78. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-2251-5_4.
Full textHue Choi, Kwon, and Soo Young Kim Shin. "Optimum Power/Rate Allocation for Minimum Delay in CDMA Downlink." In Mobile Communications, 294–303. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/3-540-36555-9_31.
Full textWang, Shaowei, and Xiaoyong Ji. "Genetic Local Search for Optimum Multiuser Detection Problem in DS-CDMA Systems." In Advanced Intelligent Computing Theories and Applications. With Aspects of Artificial Intelligence, 292–99. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-74205-0_32.
Full textChang, Po-Rong, Bor-Chin Wang, and Tan-Hsu Tan. "Optimum Multiuser Detection for CDMA Systems Using the Mean Field Annealing Neural Network." In Hardware Implementation of Intelligent Systems, 167–92. Heidelberg: Physica-Verlag HD, 2001. http://dx.doi.org/10.1007/978-3-7908-1816-1_6.
Full text"New construction methods for the optimum Grassmannian sequences in CDMA." In Electric, Electronic and Control Engineering, 181–86. CRC Press, 2015. http://dx.doi.org/10.1201/b18611-33.
Full textShukla, M., and Ruchir Gupta. "Performance Analysis of Optimum Interleaver based on Prime Numbers for Multiuser Iterative IDMA Systems." In Research, Practice, and Educational Advancements in Telecommunications and Networking, 212–26. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-4666-0050-8.ch012.
Full textConference papers on the topic "CDMA Optique"
O'Farrell, T. "Optimum single-user detection in a radio based CDMA system." In IEE Colloquium on CDMA Techniques and Applications for Third Generation Mobile Systems. IEE, 1997. http://dx.doi.org/10.1049/ic:19970713.
Full textSaquib, M., and M. H. Islam. "Optimum transmitters and receivers for CDMA systems." In Conference Record. Thirty-Fifth Asilomar Conference on Signals, Systems and Computers. IEEE, 2001. http://dx.doi.org/10.1109/acssc.2001.987757.
Full textChaufray, J. M., Ph Loubaton, and W. Hachem. "Asymptotic analysis of optimum and sub-optimum CDMA downlink MMSE receivers." In Seventh International Symposium on Signal Processing and Its Applications, 2003. Proceedings. IEEE, 2003. http://dx.doi.org/10.1109/isspa.2003.1224747.
Full textHuang Lee and Kwang-Cheng Chen. "Near-optimum trellis-coded DS/CDMA multiuser communications." In 2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484). IEEE, 2003. http://dx.doi.org/10.1109/vetecf.2003.1285998.
Full textTseng, Shun-Te, and James S. Lehnert. "Optimum Windowing for Multicarrier CDMA Systems with MMSE Receivers." In MILCOM 2007 - IEEE Military Communications Conference. IEEE, 2007. http://dx.doi.org/10.1109/milcom.2007.4455119.
Full textWang, Zuliang, Linhua Zheng, Jibing Yuan, and Guoping Jin. "Optimum Transmission Ranges in DS/CDMA Mobile Ad Hoc Networks." In 2008 4th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM). IEEE, 2008. http://dx.doi.org/10.1109/wicom.2008.606.
Full textToru Yano, Toshiyuki Tanaka, David Saad, and Satoshi Honda. "Optimum joint decoding in a LDPC-coded CDMA multiuser system." In 2008 Fifth International Conference on Networked Sensing Systems (INSS). IEEE, 2008. http://dx.doi.org/10.1109/inss.2008.4610864.
Full textYue, Xiaodong, and H. Howard Fan. "Optimum and suboptimum CDMA detectors: Near-far resistance under multipath." In Proceedings of ICASSP '02. IEEE, 2002. http://dx.doi.org/10.1109/icassp.2002.5745180.
Full textKarami, Ebrahim, and Mohsen Shiva. "A Very Near Optimum Interference Cancellation Algorithm for CDMA Signals." In 2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications. IEEE, 2006. http://dx.doi.org/10.1109/pimrc.2006.254329.
Full textXiaodong Yue and Fan. "Optimum and suboptimum CDMA detectors: near-far resistance under multipath." In IEEE International Conference on Acoustics Speech and Signal Processing ICASSP-02. IEEE, 2002. http://dx.doi.org/10.1109/icassp.2002.1005218.
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