Bibliografias temáticas / Codes orthogonaux

Literatura científica selecionada sobre o tema "Codes orthogonaux"

Autor: Grafiati
Publicado: 25 de maio de 2024

Crie uma referência precisa em APA, MLA, Chicago, Harvard, e outros estilos

Selecione um tipo de fonte:

Índice

Consulte a lista de atuais artigos, livros, teses, anais de congressos e outras fontes científicas relevantes para o tema "Codes orthogonaux".

Ao lado de cada fonte na lista de referências, há um botão "Adicionar à bibliografia". Clique e geraremos automaticamente a citação bibliográfica do trabalho escolhido no estilo de citação de que você precisa: APA, MLA, Harvard, Chicago, Vancouver, etc.

Você também pode baixar o texto completo da publicação científica em formato .pdf e ler o resumo do trabalho online se estiver presente nos metadados.

Artigos de revistas sobre o assunto "Codes orthogonaux"

1

Yen, Chih-Ta, Ing-Jr Ding e Cheng-Mu Tsai. "PERFORMANCE ANALYSIS OF SEVERAL QUASI-ORTHOGONAL CODES OPTICAL CDMA FOR RADIO-OVER-FIBER SYSTEM". Transactions of the Canadian Society for Mechanical Engineering 37, n.º 3 (setembro de 2013): 415–26. http://dx.doi.org/10.1139/tcsme-2013-0031.

Texto completo da fonte
Resumo:
An optical code-division multiple-access (OCDMA) network for radio-over-fiber (RoF) transmissions was proposed. The network encoders/decoders (codecs) were structured based on arrayed-waveguide-grating (AWG) routers coded using modified prime codes (MPCs). In the proposed system, the lower in-phase cross correlation could reduce the beating noise, and in the proposed study, its performance was compared with that of a conventional system that uses M-sequence and Walsh-Hadamard codes. The performance of both systems was numerically evaluated by analyzing the effect of phase-induced-intensity noise (PIIN). The results showed that the new code families that had lower cross correlation can suppress the intensity of the noise and effectively cancel out the multiple-access interference (MAI) in balanced detection processes, which improved system performance. By using the proposed MPC-coded OCDMA ROF network codecs, each network required only two AWG routers to accomplish the spectral coding of radio base stations (RBSs) and the decoding of control stations (CSs), resulting in a simple and low-cost system. Therefore, it is possible to produce interference- and crosstalk-free optical CDMA systems for RoF transmissions.
Estilos ABNT, Harvard, Vancouver, APA, etc.
2

Mienkina, Martin P., Claus-Stefan Friedrich, Nils C. Gerhardt, Martin F. Beckmann, Martin F. Schiffner, Martin R. Hofmann e Georg Schmitz. "Multispectral photoacoustic coded excitation imaging using unipolar orthogonal Golay codes". Optics Express 18, n.º 9 (15 de abril de 2010): 9076. http://dx.doi.org/10.1364/oe.18.009076.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
3

Tong, Ling, Qiong He, Alejandra Ortega, Alessandro Ramalli, Piero Tortoli, Jianwen Luo e Jan D’hooge. "Coded Excitation for Crosstalk Suppression in Multi-line Transmit Beamforming: Simulation Study and Experimental Validation". Applied Sciences 9, n.º 3 (31 de janeiro de 2019): 486. http://dx.doi.org/10.3390/app9030486.

Texto completo da fonte
Resumo:
(1) Background: Multi-line transmit (MLT) beamforming has been proposed for fast cardiac ultrasound imaging. While crosstalk between MLT beams could induce artifacts, a Tukey (α = 0.5)-Tukey (α = 0.5) transmit-receive (TT-) apodization can largely—but not completely—suppress this crosstalk. Coded excitation has been proposed for crosstalk suppression, but only for synthetic aperture imaging and multi-focal imaging on linear/convex arrays. The aim of this study was to investigate its (added) value to suppress crosstalk among simultaneously transmitted multi-directional focused beams on a phased array; (2) Methods: One set of two orthogonal Golay codes, as well as one set of two orthogonal chirps, were applied on a two, four, and 6MTL imaging schemes individually. These coded schemes were investigated without and with TT-apodization by both simulation and experiments; and (3) Results: For a 2MLT scheme, without apodization the crosstalk was removed completely using Golay codes, whereas it was only slightly suppressed by chirps. For coded 4MLT and 6MLT schemes, without apodization crosstalk appeared as that of non-apodized 2MLT and 3MLT schemes. TT-apodization was required to suppress the remaining crosstalk. Furthermore, the coded MLT schemes showed better SNR and penetration compared to that of the non-coded ones. (4) Conclusions: The added value of orthogonal coded excitation on MLT crosstalk suppression remains limited, although it could maintain a better SNR.
Estilos ABNT, Harvard, Vancouver, APA, etc.
4

Wirastuti, N. M. A. E. D., I. M. A. Suyadnya e D. C. Khrisne. "Performance Assessment of OFDM System using Reed-Solomon Codes over Fading Channels". Journal of Electrical, Electronics and Informatics 2, n.º 2 (31 de agosto de 2018): 48. http://dx.doi.org/10.24843/jeei.2018.v02.i02.p06.

Texto completo da fonte
Resumo:
This paper study the performance of Orthogonal Frequency Division Multiplexing (OFDM) system over AWGN and Rayleigh fading channels. OFDM performs multi-carrier transmission where all the subcarriers are orthogonal to each other. The channel coding was applied to improve the OFDM system performance. Reed Solomon (RS) codes was chosen that an efficient channel coding algorithm and has intense error correction ability. Adding the benefits of multicarrier OFDM system and Reed Solomon codes to achieve the expected system performance. The coded OFDM system was modeled over and simulated using Matlab. The bit error rate (BER) and energy bit (Eb) per noise power density (No) was performed during system simulations. QPSK modulation was used to modulate the random bits. From the simulation results It can be seen that BER vs. EB/No parameter for Coded OFDM system lower than uncoded OFDM. This was because RS codes succeed to correcting the error generated along data transmission.
Estilos ABNT, Harvard, Vancouver, APA, etc.
5

Grolmusz, Vince. "Co-Orthogonal Codes". Designs, Codes and Cryptography 38, n.º 3 (março de 2006): 363–72. http://dx.doi.org/10.1007/s10623-005-1495-4.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
6

Chee, Yeow Meng, Han Mao Kiah, San Ling e Hengjia Wei. "Geometric Orthogonal Codes of Size Larger Than Optical Orthogonal Codes". IEEE Transactions on Information Theory 64, n.º 4 (abril de 2018): 2883–95. http://dx.doi.org/10.1109/tit.2017.2788140.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
7

Asif, Muhammad, Wuyang Zhou, Qingping Yu, Xingwang Li e Nauman Ali Khan. "A Deterministic Construction for Jointly Designed Quasicyclic LDPC Coded-Relay Cooperation". Wireless Communications and Mobile Computing 2019 (26 de setembro de 2019): 1–12. http://dx.doi.org/10.1155/2019/5249373.

Texto completo da fonte
Resumo:
This correspondence presents a jointly designed quasicyclic (QC) low-density parity-check (LDPC) coded-relay cooperation with joint-iterative decoding in the destination node. Firstly, a design-theoretic construction of QC-LDPC codes based on a combinatoric design approach known as optical orthogonal codes (OOC) is presented. Proposed OOC-based construction gives three classes of binary QC-LDPC codes with no length-4 cycles by utilizing some known ingredients including binary matrix dispersion of elements of finite field, incidence matrices, and circulant decomposition. Secondly, the proposed OOC-based construction gives an effective method to jointly design length-4 cycles free QC-LDPC codes for coded-relay cooperation, where sum-product algorithm- (SPA-) based joint-iterative decoding is used to decode the corrupted sequences coming from the source or relay nodes in different time frames over constituent Rayleigh fading channels. Based on the theoretical analysis and simulation results, proposed QC-LDPC coded-relay cooperations outperform their competitors under same conditions over the Rayleigh fading channel with additive white Gaussian noise.
Estilos ABNT, Harvard, Vancouver, APA, etc.
8

Kim, Dong-Hoon, Hyung-Jung Kim e Jae-Han Lim. "Design of Optimized Coded LFM Waveform for Spectrum Shared Radar System". Sensors 21, n.º 17 (28 de agosto de 2021): 5796. http://dx.doi.org/10.3390/s21175796.

Texto completo da fonte
Resumo:
To meet the increasing demands for remote sensing, a number of radar systems using Linear Frequency Modulation (LFM) waveforms have been deployed, causing the problem of depleting frequency resources. To address this problem, several researchers have proposed the Spectrum Shared Radar System (SSRS) in which multiple radars share the same frequency band to transmit and receive their own signals. To mitigate the interferences caused by the signal transmission by other radars, SSRS employs orthogonal waveforms that inherit the orthogonality of the waveforms from orthogonal codes. However, the inherited orthogonality of the codes is significantly reduced when incorporating LFM waveforms with the codes. To solve this problem, in this paper, we propose a novel but simple scheme for generating a set of optimized coded LFM waveforms via new optimization framework. In the optimization framework, we minimize the weighted sum of autocorrelation sidelobe peaks (ASP) and cross-correlation peaks (CP) of the coded LFM waveforms to maximize the orthogonality of the waveforms. Through computer simulations, we show that the waveforms generated by the proposed scheme outperform the waveforms created by previous proposals in terms of ASP and CP.
Estilos ABNT, Harvard, Vancouver, APA, etc.
9

BASSA, Alp, e Nesrin TUTAŞ. "Extending self-orthogonal codes". TURKISH JOURNAL OF MATHEMATICS 43, n.º 5 (28 de setembro de 2019): 2177–82. http://dx.doi.org/10.3906/mat-1905-103.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
10

Gustavsson, B., e T. Grydeland. "Orthogonal-polarization alternating codes". Radio Science 44, n.º 6 (dezembro de 2009): n/a. http://dx.doi.org/10.1029/2008rs004132.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
Mais fontes

Teses / dissertações sobre o assunto "Codes orthogonaux"

1

Baechler, Brice. "Analyse et détermination de codes doublement orthogonaux pour décodage itératif". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0019/MQ57390.pdf.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
2

Cardinal, Christian. "Décodage à seuil itératif sans entrelacement des codes convolutionnels doublement orthogonaux". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ65537.pdf.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
3

Ouadid, Abdelkarim. "Prototype micro-électronique d'un décodeur itératif pour des codes doublement orthogonaux". Mémoire, École de technologie supérieure, 2004. http://espace.etsmtl.ca/715/1/OUADID_Abdelkarim.pdf.

Texto completo da fonte
Resumo:
Ce mémoire porte sur le prototypage microélectronique FPGA d'un décodeur itératif doublement orthogonal issu de récents travaux de recherche. Le nouvel algorithme est simple et présente un certain nombre d'avantages par rapport aux codes turbo très prisés actuellement dans le codage de canal. En effet, ces derniers outre la complexité de leur algorithme de décodage, souffrent d'un problème de latence qui les rend inadaptés pour certaines applications, comme la téléphonie par exemple. Le décodeur utilisé, est un décodeur itératif à quantification souple, basé sur le décodage seuil tel que présenté par Massey et amélioré par l'approximation de la probabilité a posteriori (AAPP). Grâce à cette approche, on arrive à concilier complexité, latence, performance en correction d'erreurs, et haut débit de fonctionnement. Le prototype vise à valider les résultats de simulation, ainsi que l'estimation de la complexité et de la fréquence maximale que l'on peut atteindre sur des FPGA Virtex-II XC2V6000 et ceci pour différentes structures du décodeur.
Estilos ABNT, Harvard, Vancouver, APA, etc.
4

Dru, Frédéric. "Décodage à seuil itératif des codes convolutionnels doublement orthogonaux perforés et application aux modulations multiniveaux". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ65572.pdf.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
5

Grandpierre, Benoît. "Produits automorphes, classification des réseaux et théorie du codage". Electronic Thesis or Diss., Lille 1, 2009. http://www.theses.fr/2009LIL10019.

Texto completo da fonte
Resumo:
La fonction [Phi]12 de Borcherds, forme modulaire en 26 variables pour le groupe orthogonal O+(II2,26) et le caractère déterminant, de poids singulier 12, a été construite par R.E.Borcherds en 1994 avec la théorie des produits automorphes. Elle détermine la “Fake Monster Lie Algebra”, qui joue le rôle fondamental dans la preuve de la “Moonshine Conjecture”. [Phi]12 est aussi une forme modulaire réflexive (ses zéros sont des hyperplans définissant une réflexion orthogonale de O+(II2,26)). Beaucoup d’exemples ont été construits par Borcherds, et Nikulin a montré qu’il n’y a, en principe, qu’un nombre fini de formes modulaires réflexives. Gritsenko et Nikulin ont classifié les formes modulaires réflexives dans le cas des réseaux maximaux de signature (1,2) (1998 - 2002). Enfin, d’autres exemples importants de formes réflexives de poids singuliers ont été construits par N. Scheithauer (2000 - 2005). La classification des formes modulaires réflexives est un problème très important, de telles formes ont beaucoup d’applications dans différents domaines mathématiques et physiques : en théorie des algèbres de Kac-Moody, en géométrie algébrique, en théorie des cordes... Dans cette thèse, nous décrivons une nouvelle classe de formes modulaires réflexives associée à la fonction [Phi]12 de Borcherds. La signature des groupes orthogonaux considérés varie entre (2,3) et (2,25). Toutes les formes obtenues sont des quasi-restrictions de [Phi]12. Cette méthode, très arithmétique, nous donne plus de 60 formes modulaires réflexives, dont la première est la forme modulaire de Siegel de poids 35 construite par Igusa en 1964
Borcherds’ [Phi]12 function is a modular form in 26 variables for the orthogonal group O+(II2,26) and the character determinant, of singular weight 12, it was constructed by Borcherds in 1994 together with the automorphic products theory. It determines the Fake Monster Lie Algebra, which plays the fundamental role in the proof of the Moonshine Conjecture. [Phi]12 is also a reflective form (its zeros are hyperplans of orthogonal reflections in O+(II2,26)). Many examples were constructed by Borcherds, and Nikulin has proved there is, in principle, only a finite number of reflective modular forms. Gritsenko and Nikulin classified reflective modular forms in the case of maximal lattices of signature (1,2) (1998-2002). Other important examples of reflective forms of singular weight were constructed by N. Scheithauer (2000 - 2005). The classification of reflective modular forms is a very important question, such forms have many applications in different fields of mathematics and physics : in the theory of Kac-Moody algebras, in algebraic geometry, in string theory... In this thesis, we describe a new class of reflective forms related to the Borcherds’function [Phi]12. The signature of the orthogonal groups we consider goes between (2,3) and (2,25). All the forms we obtain are quasi pull-back of [Phi]12. This arithmetic method gives more than 60 reflective modular forms, the first of them being the Siegel modular form of weight 35 constructed by Igusa in 1964
Estilos ABNT, Harvard, Vancouver, APA, etc.
6

Grandpierre, Benoît. "Produits automorphes, classification des réseaux et théorie du codage". Thesis, Lille 1, 2009. http://www.theses.fr/2009LIL10019/document.

Texto completo da fonte
Resumo:
La fonction [Phi]12 de Borcherds, forme modulaire en 26 variables pour le groupe orthogonal O+(II2,26) et le caractère déterminant, de poids singulier 12, a été construite par R.E.Borcherds en 1994 avec la théorie des produits automorphes. Elle détermine la “Fake Monster Lie Algebra”, qui joue le rôle fondamental dans la preuve de la “Moonshine Conjecture”. [Phi]12 est aussi une forme modulaire réflexive (ses zéros sont des hyperplans définissant une réflexion orthogonale de O+(II2,26)). Beaucoup d’exemples ont été construits par Borcherds, et Nikulin a montré qu’il n’y a, en principe, qu’un nombre fini de formes modulaires réflexives. Gritsenko et Nikulin ont classifié les formes modulaires réflexives dans le cas des réseaux maximaux de signature (1,2) (1998 - 2002). Enfin, d’autres exemples importants de formes réflexives de poids singuliers ont été construits par N. Scheithauer (2000 - 2005). La classification des formes modulaires réflexives est un problème très important, de telles formes ont beaucoup d’applications dans différents domaines mathématiques et physiques : en théorie des algèbres de Kac-Moody, en géométrie algébrique, en théorie des cordes... Dans cette thèse, nous décrivons une nouvelle classe de formes modulaires réflexives associée à la fonction [Phi]12 de Borcherds. La signature des groupes orthogonaux considérés varie entre (2,3) et (2,25). Toutes les formes obtenues sont des quasi-restrictions de [Phi]12. Cette méthode, très arithmétique, nous donne plus de 60 formes modulaires réflexives, dont la première est la forme modulaire de Siegel de poids 35 construite par Igusa en 1964
Borcherds’ [Phi]12 function is a modular form in 26 variables for the orthogonal group O+(II2,26) and the character determinant, of singular weight 12, it was constructed by Borcherds in 1994 together with the automorphic products theory. It determines the Fake Monster Lie Algebra, which plays the fundamental role in the proof of the Moonshine Conjecture. [Phi]12 is also a reflective form (its zeros are hyperplans of orthogonal reflections in O+(II2,26)). Many examples were constructed by Borcherds, and Nikulin has proved there is, in principle, only a finite number of reflective modular forms. Gritsenko and Nikulin classified reflective modular forms in the case of maximal lattices of signature (1,2) (1998-2002). Other important examples of reflective forms of singular weight were constructed by N. Scheithauer (2000 - 2005). The classification of reflective modular forms is a very important question, such forms have many applications in different fields of mathematics and physics : in the theory of Kac-Moody algebras, in algebraic geometry, in string theory... In this thesis, we describe a new class of reflective forms related to the Borcherds’function [Phi]12. The signature of the orthogonal groups we consider goes between (2,3) and (2,25). All the forms we obtain are quasi pull-back of [Phi]12. This arithmetic method gives more than 60 reflective modular forms, the first of them being the Siegel modular form of weight 35 constructed by Igusa in 1964
Estilos ABNT, Harvard, Vancouver, APA, etc.
7

Odhiambo, 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 fonte
Resumo:
Ce travail propose la mise en œuvre de la focalisation spatiale de données (FSD) en utilisant des techniques de spectre étalé. La FSD a récemment été proposée comme alternative aux schémas classiques de focalisation de puissance dans des scenarios de geocasting (diffusion géolocalisée des données). Dans la FSD, ce sont de données à transmettre qui sont traitées de telle qu'elles ne peuvent être décodées qu'à un endroit prédéfini. Ce travail exploite la double orthogonalité due aux IQ et aux séquences orthogonales d'étalement Gold pour concevoir le schéma de focalisation spatiale de données basé sur le IQ et le spectre étalé (DSSS-SDF-IQ). Il est démontré que la FSD permet d’obtenir des faisceaux plus étroits par rapport aux scénarios de focalisation de puissance. La robustesse du schéma proposé est ensuite démontrée par sa mise en œuvre sur un modèle de canal à trajets multiples. Il est démontré que la FSD atteint une largeur de faisceau allant jusqu'à 1 degré avec un réseau de 4 antennes seulement. Le chapitre 1 introduit le concept de géocasting. Le chapitre 2 passe en revue les différentes techniques qui permettent d'obtenir des capacités directionnelles sur les stations de base. Le chapitre 3 présente les principes de l'étalement du spectre par séquence directe basé sur la FSD. Le chapitre 4 étudie l'influence du canal à trajets multiples sur le schéma proposé. Pour tous les cas étudiés ci-dessus, des simulations pertinentes sont mises en œuvre pour valider les discussions. Le chapitre 5 résume le travail avec une conclusion et une perspective sur les orientations possibles de la recherche future
This 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
Estilos ABNT, Harvard, Vancouver, APA, etc.
8

Semerciler, Salih. "Coded orthogonal signaling". Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/23567.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
9

Merensky, Alexander Mark. "A multi-dimensional code-division-multiplexed OFDMA modem using cyclic rotated orthogonal complete complementary codes". Diss., University of Pretoria, 2012. http://hdl.handle.net/2263/31146.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
10

Boussebt, Amina. "Etude et mise en oeuvre de la technologie Li-Fi pour un lit de bébé connecté sans fil et sans radio". Electronic Thesis or Diss., Limoges, 2023. http://www.theses.fr/2023LIMO0091.

Texto completo da fonte
Resumo:
Le domaine de la télésurveillance a connu un grand essor ces dernières décennies et concerne divers contextes par exemple en milieu hospitalier, en maison de retraite, chez les particuliers. La majorité des systèmes de télésurveillance existants aujourd’hui reposent sur la technologie des radiofréquences (RF). Nous proposons dans cette thèse, des travaux portant sur la télésurveillance dans un contexte nouveau qui concerne une crèche. Les RF présentant certains inconvénients, comme l’impact des interférences électromagnétiques, mais aussi des failles de sécurité, une solution alternative est la technologie de communication par optique sans fil. Ainsi, nous avons étudié l'utilisation de la technologie infrarouge pour la transmission simultanée de données issues de capteurs placés sur les pieds des lits de bébé mais aussi sur les bébés couchés dans leur lit au sein de la crèche. Le système de réception est constitué de photodiodes situées aux coins d'un panneau d'éclairage central au plafond de l'environnement. La simulation du canal réalisée grâce à la technique de lancer de rayons associés à la méthode de Monte-Carlo a permis de déterminer le gain du canal pour chaque dispositif. Plusieurs scénarios de déploiement ont été définis en considérant le caractère amovible ou fixe des dispositifs et l’interchangeabilité des lits dans la pièce. Le partage du canal utilise la technique d’accès multiple par répartition de codes (OCDMA) associée aux codes optiques orthogonaux (OOC) dont la principale limitation est l’interférence d’accès multiple (IAM). Les performances de la modulation binaire par position d’impulsion (2-PPM) avec OCDMA et un décodage souple en réception ont été établies théoriquement et par simulation pour les différents scénarios définis considérant un réseau de 11 utilisateurs constitué de 8 lits et 3 dispositifs portés par des bébés. Les résultats ont été obtenus avec des récepteurs conventionnels par corrélation sans et avec limiteur puis un récepteur à annulation parallèle d’interférence plus efficace pour réduire l’impact de l’IAM. De plus, la faisabilité de l’utilisation de la technique OCDMA pour la transmission simultanée en optique sans fil a été mise en évidence par des expérimentations menées grâce à un banc de test développé en radio logicielle. Le banc a été mis en place, en utilisant des USRP (Universal Software Radio Peripheral) et des front-ends optique sans fil développés spécifiquement
The field of the remote monitoring has experienced significant advancements in recent decades, and now covers different contexts, such as hospitals, retirement homes, and private homes also. The majority of existing systems are based on radio frequency technology (RF).We propose in this thesis, research focused on remote monitoring in a new context involving a nursery. Given the limitations of RF technology, including the impact of electromagnetic interference, and security vulnerabilities, an alternative solution is optical wireless communication technology. Therefore, we investigated the use of infrared technology for simultaneous transmission of data collected from sensors placed on the foot of baby beds, and also on the babies themselves lying in their beds within the nursery. The reception system consists of photodiodes positioned at the corners of a central lighting panel on the celling. The channel simulation carried out using ray-tracing and Monte-Carlo methods was used to determine the channel gain for each device. Several deployment scenarios were defined, considering the nature of the devices (removable or fixed) and the interchangeability of beds in the room. The channel sharing employs the code division multiple access (OCDMA) associated with the optical orthogonal codes (OOC) with the primary constraint being the137 multiple access interference (MAI). The performance of binary pulse position modulation (2- PPM) with OCDMA and soft decoding in reception was studied theoretically and by simulation involving the different scenarios. These scenarios consider a network of 11 users, consisting of 8 beds and 3 devices carried by babies. Results were obtained using the conventional correlation receiver without and with hard limiters, as well as a parallel interference cancellation receiver to reduce the impact of MAI. Additionally, the feasibility of implementing OCDMA technology for simultaneous optical wireless communication transmission was demonstrated through experimental work using a test bench developed in software-defined radio. The test bench was established using universal software radio peripheral (USRP), and specially designed wireless optical front-ends
Estilos ABNT, Harvard, Vancouver, APA, etc.
Mais fontes

Livros sobre o assunto "Codes orthogonaux"

1

Semerciler, Salih. Coded orthogonal signaling. Monterey, Calif: Naval Postgraduate School, 1992.

Encontre o texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
2

Liang, Guan Yong, e Tjhung Tjeng Thiang, eds. Quasi-orthogonal space-time block code. London: Distributed by World Scientific, 2007.

Encontre o texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
3

Stevens, Janet Emerson. Trellis coded modulation applied to orthogonal signals. Monterey, Calif: Naval Postgraduate School, 1993.

Encontre o texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
4

Petroutsos, Alexander. Optical orthogonal codes for use in a CDMA fibre optic LAN. Manchester: UMIST, 1995.

Encontre o texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
5

Roderick, David V. A coded orthogonal frequency division multiplexing simulation of a high data rate, line-of-sight, digital radio for mobile maritime communications. Monterey, Calif: Naval Postgraduate School, 1997.

Encontre o texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
6

1952-, Hanzo Lajos, ed. OFDM and MC-CDMA for broadband multi-user communications, WLANs, and broadcasting. [Piscataway, N.J.]: IEEE Press, 2003.

Encontre o texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
7

Battle of wits: The complete story of codebreaking in World War II. New York: Simon & Schuster, 2002.

Encontre o texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
8

Budiansky, Stephen. Battle of wits: The complete story of codebreaking in World War II. New York: Free Press, 2000.

Encontre o texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
9

Budiansky, Stephen. Battle of wits: The complete story of codebreaking in World War II. New York: Free Press, 2000.

Encontre o texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
10

Battle of wits: The complete story of codebreaking in World War II. New York: Free Press, 2000.

Encontre o texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
Mais fontes

Capítulos de livros sobre o assunto "Codes orthogonaux"

1

Grolmusz, Vince. "Co-orthogonal Codes". In Lecture Notes in Computer Science, 144–52. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-45655-4_17.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
2

Mienkina, M. P., C. S. Friedrich, N. C. Gerhardt, M. R. Hofmann e Georg Schmitz. "Multispectral Photoacoustic Coded Excitation using Orthogonal Unipolar Golay Codes". In IFMBE Proceedings, 217–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03879-2_61.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
3

Monroe, Laura. "Self-Orthogonal Greedy Codes". In Codes, Designs and Geometry, 75–79. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-1423-3_7.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
4

Tamm, Ulrich. "Communication complexity and orthogonal polynomials". In Codes and Association Schemes, 277–85. Providence, Rhode Island: American Mathematical Society, 2001. http://dx.doi.org/10.1090/dimacs/056/21.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
5

Omrani, Reza, Oscar Moreno e P. Vijay Kumar. "Topics on Optical Orthogonal Codes". In Sequences and Their Applications - SETA 2004, 396–405. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11423461_30.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
6

Fumy, W. "Orthogonal transform encoding of cyclic codes". In Algebraic Algorithms and Error-Correcting Codes, 131–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/3-540-16776-5_715.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
7

Hedayat, A. S., N. J. A. Sloane e John Stufken. "Orthogonal Arrays and Error-Correcting Codes". In Springer Series in Statistics, 61–86. New York, NY: Springer New York, 1999. http://dx.doi.org/10.1007/978-1-4612-1478-6_4.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
8

Hedayat, A. S., N. J. A. Sloane e John Stufken. "Construction of Orthogonal Arrays from Codes". In Springer Series in Statistics, 87–111. New York, NY: Springer New York, 1999. http://dx.doi.org/10.1007/978-1-4612-1478-6_5.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
9

Wu, Dianhua, Jiayun Cao e Pingzhi Fan. "New Optimal Variable-Weight Optical Orthogonal Codes". In Sequences and Their Applications – SETA 2010, 102–12. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15874-2_8.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
10

Bitan, Sara, e Tuvi Etzion. "On constructions for optimal optical orthogonal codes". In Algebraic Coding, 111–25. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/3-540-57843-9_13.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.

Trabalhos de conferências sobre o assunto "Codes orthogonaux"

1

Harman, S. A. "Orthogonal polyphase code sets with master codes". In 2004 International Waveform Diversity & Design Conference. IEEE, 2004. http://dx.doi.org/10.1109/iwddc.2004.8317552.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
2

Wu, Weiqi, Ammar Hawbani e Wei Gong. "Ortho-CodeA: Orthogonal Codes Assisted Backscatter Multiple Access". In 2023 IEEE International Conference on Pervasive Computing and Communications (PerCom). IEEE, 2023. http://dx.doi.org/10.1109/percom56429.2023.10099216.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
3

Chee, Yeow Meng, Han Mao Kiah, San Ling e Hengjia Wei. "Geometric orthogonal codes better than optical orthogonal codes". In 2017 IEEE International Symposium on Information Theory (ISIT). IEEE, 2017. http://dx.doi.org/10.1109/isit.2017.8006758.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
4

Cardinal, Christian, e Bakitanga-Florian Mvutu. "Coded M-PSK Modulation using Convolutional Self-Doubly Orthogonal Codes". In 2009 IEEE 69th Vehicular Technology Conference Spring. IEEE, 2009. http://dx.doi.org/10.1109/vetecs.2009.5073447.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
5

Wen, James Z., Yang Tao e Xiangyang Yang. "Crosstalk in phase-coded holographic memories using different orthogonal codes". In Optical Science, Engineering and Instrumentation '97, editado por Francis T. S. Yu e Shizhuo Yin. SPIE, 1997. http://dx.doi.org/10.1117/12.287776.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
6

Gevers, Martin, Patrik Gebhardt, Michael Vogt e Thomas Musch. "Code-division-multiplexing using orthogonal codes for fast electrical impedance tomography". In 2014 IEEE International Instrumentation and Measurement Technology Conference (I2MTC). IEEE, 2014. http://dx.doi.org/10.1109/i2mtc.2014.6860919.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
7

Liva, Gianluigi, Balazs Matuz, Enrico Paolini e Mark F. Flanagan. "Non-binary LDPC codes for orthogonal modulations: Analysis and code design". In ICC 2017 - 2017 IEEE International Conference on Communications. IEEE, 2017. http://dx.doi.org/10.1109/icc.2017.7996749.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
8

Kim, Sang-Min, Jae-Hee Song e Tai-Kyong Song. "Harmonic Golay coded excitation using mutually orthogonal Golay codes and pulse inversion". In SPIE Medical Imaging, editado por Stephen A. McAleavey e Jan D'hooge. SPIE, 2009. http://dx.doi.org/10.1117/12.811550.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
9

Mienkina, Martin P., Annika Eder, Georg Schmitz, Claus-Stefan Friedrich, Nils C. Gerhardt e Martin R. Hofmann. "Feasibility study of multispectral photoacoustic coded excitation using orthogonal unipolar Golay codes". In 2009 IEEE International Ultrasonics Symposium. IEEE, 2009. http://dx.doi.org/10.1109/ultsym.2009.5441941.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
10

Ihan Martoyo, Philip, Andi Susanto, Eddy Wijanto, Herman Kanalebe e Kuniwati Gandi. "Chaos codes vs. orthogonal codes for CDMA". In Applications (ISSSTA). IEEE, 2010. http://dx.doi.org/10.1109/isssta.2010.5652316.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.

Relatórios de organizações sobre o assunto "Codes orthogonaux"

1

Kondrashov, Dmitri, Joseph Wang e Paulette C. Liewer. A Study of Stability and Energy Conservation of a 3-D Electromagnetic PIC Code for Non-Orthogonal Meshes. Fort Belvoir, VA: Defense Technical Information Center, janeiro de 1997. http://dx.doi.org/10.21236/ada357700.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
Você também pode estar interessado nas extensas listas de trabalhos sobre o assunto "Codes orthogonaux":
Artigos de revistas Teses / dissertações Livros
Oferecemos descontos em todos os planos premium para autores cujas obras estão incluídas em seleções literárias temáticas. Contate-nos para obter um código promocional único!

Vá para a bibliografia