Literatura científica selecionada sobre o tema "Modulation à étalement de spectre"
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Artigos de revistas sobre o assunto "Modulation à étalement de spectre"
BoujemÂa, Hatem, e Mohamed Siala. "Récepteurs en râteau pour les systèmes à étalement de spectre par séquences directes". Annales Des Télécommunications 56, n.º 5-6 (maio de 2001): 291–305. http://dx.doi.org/10.1007/bf03001332.
Texto completo da fonteBouchon, Patrick, e Yannick de Wilde. "Rayonnement thermique infrarouge de nano-antennes plasmoniques individuelles". Photoniques, n.º 105 (novembro de 2020): 32–36. http://dx.doi.org/10.1051/photon/202010532.
Texto completo da fonteLiu, Zi Yi, Xing Xing Jing e Wen Xi. "Design of a Sawtooth Generator Applied for Class-D Audio Power Amplifier". Applied Mechanics and Materials 241-244 (dezembro de 2012): 693–97. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.693.
Texto completo da fonteGiacardy, P., M. Viellard, C. Chatel, E. Jourdan, E. Avenel, S. Elissalde, P. Grandgeorge et al. "Troubles de la modulation sensorielle et difficultés adaptatives dans les troubles du spectre de l’autisme". Archives de Pédiatrie 25, n.º 5 (julho de 2018): 315–21. http://dx.doi.org/10.1016/j.arcped.2018.05.005.
Texto completo da fontePissondes, Jean-Claude. "Optique et phénomène de moiré : Le moiré comme interféromètre graphique". J3eA 21 (2022): 2014. http://dx.doi.org/10.1051/j3ea/20222014.
Texto completo da fonteZulkalnain, Mohd Khairi, e Yan Chiew Wong. "Current mismatch reduction in charge pumps using regulated current stealing-injecting transistors for PLLs". Indonesian Journal of Electrical Engineering and Computer Science 24, n.º 1 (1 de outubro de 2021): 61. http://dx.doi.org/10.11591/ijeecs.v24.i1.pp61-69.
Texto completo da fonteBallon, N., S. Berthoz, P. Brunault e N. Rigal. "L’alimentation est-elle soluble dans la psychologie et la psychiatrie ? Cas de l’alimentation émotionnelle et de l’addiction à l’alimentation". European Psychiatry 30, S2 (novembro de 2015): S29. http://dx.doi.org/10.1016/j.eurpsy.2015.09.087.
Texto completo da fonteTeses / dissertações sobre o assunto "Modulation à étalement de spectre"
Bertrand, Joël. "Algorithmes de traitement d'antenne appliqués aux systèmes de communications numériques à étalement de spectre". Paris, CNAM, 2002. http://www.theses.fr/2002CNAM0419.
Texto completo da fonteThis Phd thesis talks about modulation and demodulation algorithms suitable in a base station using antenna array both in uplink and downlink mode and working with a CDMA radiomobile configuration. Firts we will focus on the elaboration of a space-time receiver algorithm which tends to reduce interferences from other mobiles than lose of interests. This algorithm is placed near a Rake2D demodulator (reference algorithm) in a simulator that processes real signals. Once the signals of interest are synchronised in frequency and in time, we compare the error rate of both algorithm. The low gain in term of error rate of the anti-reference algorithm compared to the reference algorithm leads us to propose a new criterion for the receiver. This criterion leads to optimal, linear, multiuser space-time receiver. The final structure is an MLSE receiver that was validated by a whole of numerical simulations based on synthesized signals using non-cyclic spreading codes. In a second time, we leave receiver algorithm to focus on transmitter algorithm. We present a new algorithm which is able to compute power and antenna weights associated to all mobiles in a cell. This algorithm, named Obèle algorithm, converges to the minimum of the configutaion space
Jomphe, Sébastien. "Réalisation et validation en VHDL d'un récepteur de station de base à modulation en étalement de spectre". Mémoire, École de technologie supérieure, 2005. http://espace.etsmtl.ca/373/1/JOMPHE_S%C3%A9bastien.pdf.
Texto completo da fonteBaudais, 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.
Texto completo da fontecombinaison permet de tirer partie de la robustesse et de l'efficacité spectrale de l'OFDM, et de la capacité d'accès multiple des techniques AMRC. Deux techniques associant l'OFDM et l'AMRC sont plus particulièrement analysées.
La première technique, l'AMRC à porteuses multiples est étudiée sur un canal de Rayleigh à trajets multiples. En réception, plusieurs techniques d'égalisation ou de traitement de diversité sont mises en oeuvre et une approche plus globale de la détection est proposée. Elle consiste à intégrer la fonction de désétalement dans le processus d'égalisation, permettant ainsi d'améliorer la fiabilité de la détection. Ces techniques d'égalisation sont insérées et combinées de différentes façons dans des structures d'annulation d'interférences.
Si le système AMRC à porteuses multiples est généralement proposé pour des liaisons synchrones ou quasi-synchrones, le système AMRC
multipilote peut être utilisé dans un contexte asynchrone. Les performances théoriques de ce système sont développées et comparées aux performances des systèmes AMRC à porteuse unique.
Nobilet, Stéphane. "Etude et optimisation des techniques MC-CDMA pour les futures générations de sytèmes de communications hertziennes". Rennes, INSA, 2003. http://www.theses.fr/2003ISAR0010.
Texto completo da fonteOdhiambo, Michael Derrick. "Spatial data focusing using direct sequence spread spectrum modulation". Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS060.
Texto completo da fonteThis work proposes the implementation of Spatial Data Focusing (SDF) using spread spectrum techniques. SDF was recently proposed as a candidate alternative to classical power focusing schemes in wireless geocasting applications. Unlike power focusing approaches where radiated power is directed to a defined direction, in SDF, it is the data to be transmitted that is processed in such a manner that it can only be decoded at a predefined location. This work exploits the dual orthogonality due to classical quadrature components and orthogonal Gold spreading sequences to design the IQ and spread spectrum based spatial data focusing (DSSS-SDF-IQ) scheme. It is demonstrated that SDF attains better spatial selectivity than classical power focusing for a given antenna array size. The robustness of the proposed scheme is subsequently demonstrated by implementing it over a classical Urban Canyon 6-ray multipath channel model, where it is shown that the scheme can exhibit beamwidth as narrow as 1 degree with only a 4-antenna array. In SDF, the beamwidth is defined as the area within which data can be decoded as opposed to classical half power beamwidth. Chapter 1 introduces the concept of geocasting. Chapter 2 reviews the different techniques that enable directional capabilities on base stations. Chapter 3 introduces the principles of direct sequence spread spectrum based SDF. Chapter 4 investigates the influence of multipath channel on DSSS-SDF scheme. For all the cases studied above, relevant simulations are implemeneted to validate the discussions. Chapter 5 summarizes the work with a conclusion and perspective on possible future research directions
Abassi, Oussama. "Étude des décodeurs LDPC non-binaires". Lorient, 2014. https://hal.science/tel-01176817.
Texto completo da fontePallavisini, A. "Système d'interférences radiofréquences pour la cryptographie par chaos appliquée aux transmissions hertziennes". Phd thesis, Université de Franche-Comté, 2007. http://tel.archives-ouvertes.fr/tel-00373707.
Texto completo da fonteJdidi, Anis. "On the use of hierarchical modulation for resource allocation in OFDMA-based networks". Electronic Thesis or Diss., Evry, Institut national des télécommunications, 2011. http://www.theses.fr/2011TELE0024.
Texto completo da fonteWe investigate, in this thesis, the use of Hierarchical Modulation (HM), a physical layer technique that enables to exploit multiuser diversity, for resource allocation in OFDMA-based systems with and without use of relaying, so as to improve the system capacity. HM allows the sharing of the resources, namely subcarriers and power, between users of different radio conditions by sending an additional stream to a user with good radio conditions on a subcarrier that was initially allocated to carry an original stream to a user with lower radio conditions. And this, without affecting the original user's rate nor the total amount of power assigned to the shared subcarrier. In the literature, most of the works that consider the use of HM focus solely on the physical layer performance, notably in terms of the bit error rate. And this for a static user scenario,i.e., with a fixed number of users in the system, each with an infinite service duration. This configuration however does not reflect the real system behavior where the number of users is dynamic, i.e., the users come to the system at random time epochs and leave it after a finite duration, corresponding to the completion of their services. The study of the system at the flow-level, as opposed to the packet level, for a dynamic user configuration, enables us to investigate the realistic relationship between capacity and demand and to quantify several system-level performance metrics, such as mean transfer times and blocking rates, which are meaningful both to the user and the network operator/provider
Jdidi, Anis. "On the use of hierarchical modulation for resource allocation in OFDMA-based networks". Phd thesis, Institut National des Télécommunications, 2011. http://tel.archives-ouvertes.fr/tel-00698488.
Texto completo da fonteBala, Mokrane. "Contributions à l'amélioration de la loi de commande d'une machine électrique d'un compresseur de climatisation : réduction du nombre de capteurs de courant". Thesis, université Paris-Saclay, 2021. http://www.theses.fr/2021UPAST014.
Texto completo da fonteThis thesis work is part of the EDC (Electrical Driven Compressor) project, which aims to develop reliable, compact electric air conditioning compressors that comply with automotive standards and have low production costs. This thesis is made up of two parts. The first one is devoted to the elimination of phase current sensors and their replacement by a single current sensor at the DC bus level. This removal was performed with the help of an algorithm for the reconstruction of phase currents. The modification of the SVPWM control law by an analytical algorithm was made necessary in order to ensure the reconstruction of the phase currents over the entire operating range. Simulation and experimentation results have shown the good working of the phase current reconstruction algorithm using the modified SVPWM. The aim of the second part of this work was to reduce electromagnetic interference by control, using spread spectral techniques based on random PWM. The complexity of this part mainly concerned the adaptation of this method to our reconstruction algorithm based on the modified SVPWM. The simulation results and the experimental results showed good spectral spreading of the different harmonics of the phase currents and the output voltages of the inverter
Livros sobre o assunto "Modulation à étalement de spectre"
CDMA: Principles of spread spectrum communication. Reading, Mass: Addison-Wesley Pub. Co., 1995.
Encontre o texto completo da fonteTransceiver and system design for digital communications. 4a ed. London: Scitech Publishing, an imprint of the IET, 2014.
Encontre o texto completo da fonte1950-, Bullock Scott R., ed. Transceiver and system design for digital communications. 2a ed. Tucker, GA: Noble Pub. Corp., 2000.
Encontre o texto completo da fonteTransceiver system design for digital communications. Atlanta, GA: Noble Pub., 1995.
Encontre o texto completo da fonteTransceiver and system design for digital communications. 3a ed. Raleigh, NC: SciTech Pub., 2008.
Encontre o texto completo da fonteBullock, Scott R. Transceiver and System Design for Digital Communications. SciTech Publishing, Incorporated, 2009.
Encontre o texto completo da fonteBullock, Scott R. Transceiver and System Design for Digital Communications. SciTech Publishing, Incorporated, 2014.
Encontre o texto completo da fonteBullock, Scott R. Transceiver and System Design for Digital Communications. Institution of Engineering & Technology, 2017.
Encontre o texto completo da fonteSilva, Paulo, e Rui Dinis. Frequency-Domain Multiuser Detection for CDMA Systems. River Publishers, 2022.
Encontre o texto completo da fonteSilva, Paulo, e Rui Dinis. Frequency-Domain Multiuser Detection for CDMA Systems. River Publishers, 2022.
Encontre o texto completo da fonteTrabalhos de conferências sobre o assunto "Modulation à étalement de spectre"
Pilatis, Nick, Michael Whiteman, Paul Madden, Michael A. Macquisten e A. John Moran. "Forced Combustion Experiments on Aero Combustors". In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-45235.
Texto completo da fonte