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Littérature scientifique sur le sujet « Joint Spatial Division and Multiplexing »

Auteur : Grafiati

Publié le 25 janvier 2025

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Articles de revues sur le sujet "Joint Spatial Division and Multiplexing"

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Jiang, Zheng, Bin Han, Peng Chen, Fengyi Yang et Qi Bi. « Design of Joint Spatial and Power Domain Multiplexing Scheme for Massive MIMO Systems ». International Journal of Antennas and Propagation 2015 (2015) : 1–10. http://dx.doi.org/10.1155/2015/368463.

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Massive Multiple-Input Multiple-Output (MIMO) is one of the key techniques in 5th generation wireless systems (5G) due to its potential ability to improve spectral efficiency. Most of the existing works on massive MIMO only consider Time Division Duplex (TDD) operation that relies on channel reciprocity between uplink and downlink channels. For Frequency Division Duplex (FDD) systems, with continued efforts, some downlink multiuser MIMO scheme was recently proposed in order to enable “massive MIMO” gains and simplified system operations with limited number of radio frequency (RF) chains in FDD system. However these schemes, such as Joint Spatial Division and Multiplexing (JSDM) scheme and hybrid precoding scheme, only focus on multiuser transmission in spatial domain. Different from most of the existing works, this paper proposes Joint Spatial and Power Multiplexing (JSPM) scheme in FDD systems. It extends existing FDD schemes from spatial division and multiplexing to joint spatial and power domain to achieve more multiplexing gain. The user grouping and scheduling scheme of JSPM is studied and the asymptotic expression for the sum capacity is derived as well. Finally, simulations are conducted to illustrate the effectiveness of the proposed scheme.

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Zalevsky, Zeev, Avi Rubner, Javier García, Pascuala Garcia-Martinez, Carlos Ferreira et Emanuel Marom. « Joint transform correlator with spatial code division multiplexing ». Applied Optics 45, n^o 28 (1 octobre 2006) : 7325. http://dx.doi.org/10.1364/ao.45.007325.

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Adhikary, Ansuman, Ebrahim Al Safadi, Mathew K. Samimi, Rui Wang, Giuseppe Caire, Theodore S. Rappaport et Andreas F. Molisch. « Joint Spatial Division and Multiplexing for mm-Wave Channels ». IEEE Journal on Selected Areas in Communications 32, n^o 6 (juin 2014) : 1239–55. http://dx.doi.org/10.1109/jsac.2014.2328173.

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Adhikary, Ansuman, Junyoung Nam, Jae-Young Ahn et Giuseppe Caire. « Joint Spatial Division and Multiplexing—The Large-Scale Array Regime ». IEEE Transactions on Information Theory 59, n^o 10 (octobre 2013) : 6441–63. http://dx.doi.org/10.1109/tit.2013.2269476.

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Et. al., Keshav N,. « Millimetre Wave Communication with Spatial Division Multiplexing for 5G systems ». Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, n^o 7 (5 juin 2021) : 2609–16. http://dx.doi.org/10.17762/turcomat.v12i7.3632.

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The point of this paper is to combination of spatial division multiplexing (SDMA) along with NOMA improves the performance of the system. This paper is done with multibeam forming for performance enhancement, Analog beam forming is done along with the digital beam forming to increase the spectral efficiency and also the user count increases so that we could able to achieve high throughput. In this paper the design problems of mm wave NOMA due to beamforming is focused so that achievable data rate is high. This is due to the number of RF chains. We analyses the demanding joint plan of the intertwined power distribution and client matching for mm Wave-SDMA. Some problems are talked about and a few arrangements are proposed in detail in mm Wave communications.

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Song, Yunchao, Chen Liu, Yiliang Liu, Nan Cheng, Yongming Huang et Xuemin Shen. « Joint Spatial Division and Multiplexing in Massive MIMO : A Neighbor-Based Approach ». IEEE Transactions on Wireless Communications 19, n^o 11 (novembre 2020) : 7392–406. http://dx.doi.org/10.1109/twc.2020.3011101.

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S. Luis, Ruben, Hideaki Furukawa, Georg Rademacher, Benjamin J. Puttnam et Naoya Wada. « Demonstration of an SDM Network Testbed for Joint Spatial Circuit and Packet Switching † ». Photonics 5, n^o 3 (28 juillet 2018) : 20. http://dx.doi.org/10.3390/photonics5030020.

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We demonstrate a spatial division multiplexing (SDM) network testbed composed of three nodes connected via 19-core multi-core fibers. Each node is capable of joint spatial circuit switching and joint packet switching to support 10 Tb/s spatial circuit super channels and 1 Tb/s line rate spatial packet super channels. The performance of the proposed hybrid network is evaluated, showing successful co-existence of both systems in the same network to provide high capacity and high granularity services. Finally, we demonstrate an optical channel selection associated with the quality of service requirements on the SDM network testbed.

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Pederzolli, Federico, Domenico Siracusa, Behnam Shariati, José Manuel Rivas-Moscoso, Elio Salvadori et Ioannis Tomkos. « Improving Performance of Spatially Joint-Switched Space Division Multiplexing Optical Networks via Spatial Group Sharing ». Journal of Optical Communications and Networking 9, n^o 3 (13 février 2017) : B1. http://dx.doi.org/10.1364/jocn.9.0000b1.

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Nam, Junyoung, Ansuman Adhikary, Jae-Young Ahn et Giuseppe Caire. « Joint Spatial Division and Multiplexing : Opportunistic Beamforming, User Grouping and Simplified Downlink Scheduling ». IEEE Journal of Selected Topics in Signal Processing 8, n^o 5 (octobre 2014) : 876–90. http://dx.doi.org/10.1109/jstsp.2014.2313808.

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Maatouk, Ali, Salah Eddine Hajri, Mohamad Assaad et Hikmet Sari. « On Optimal Scheduling for Joint Spatial Division and Multiplexing Approach in FDD Massive MIMO ». IEEE Transactions on Signal Processing 67, n^o 4 (15 février 2019) : 1006–21. http://dx.doi.org/10.1109/tsp.2018.2886163.

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Thèses sur le sujet "Joint Spatial Division and Multiplexing"

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Parker, Michael Charles. « Dynamic holograms for wavelength division multiplexing ». Thesis, University of Cambridge, 1997. https://www.repository.cam.ac.uk/handle/1810/251616.

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Hussein, Youssef. « Development of Optimal Reconfigurable Smart Surfaces for Massive MIMO Wireless Communications ». Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASG128.

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L'évolution technologique rapide introduite par les générations des communications sans fil a été motivé par l'émergence de services à fortes valeurs ajoutées nécessitant toujours plus de débit mais aussi une couverture bien meilleure, ceci conduisant in fine à utiliser le spectre plus efficacement. Pour ce faire, la Sixième Génération (6G) des réseaux sans fil, pourra s'appuyer sur des technologies innovantes telles que les Surfaces Intelligentes Reconfigurables (RIS) et le Massive Multiple Input Multiple Output (mMIMO), ces dernières pourraient y jouer des rôles cruciaux. Cette thèse explore l'intégration des RIS dans les systèmes mMIMO dans le but d'améliorer les performances des communications sans fil.La première partie de la thèse, porte sur l'application de la Division et Multiplexage Spatiaux Conjoint (JSDM) dans les systèmes MIMO multi-utilisateur assistés par une RIS. En positionnant stratégiquement les RIS près des utilisateurs dont les canaux directs avec la station de base (BS) sont dégradés, nous développons des solutions pour adapter les algorithmes de regroupement d'utilisateurs JSDM en prenant en compte les configurations RIS. Cette approche exploite les signatures spatiales et introduit une étape de précodage supplémentaire pour le JSDM, atténuant les effets néfastes du canal RIS-BS, améliorant ainsi significativement le débit somme et la couverture du système. Les solutions proposées démontrent le potentiel des RIS dans le but d'améliorer la couverture en établissant des liens robustes entre la BS et les utilisateurs, améliorant ainsi les performances globales du réseau.La deuxième partie aborde le défi des canaux BS-RIS de faible rang en proposant un système RIS distribué. En déployant des RIS intermédiaires entre la BS et une RIS principale, nous créons un canal intégré ayant un rang amélioré, et adapté pour servir plusieurs utilisateurs simultanément. La performance de ce paradigme est évaluée en prenant un précodage Regularized Zero Forcing (RZF) et le JSDM,les décalages de phase des signaux, par les RISs, y sont optimisés par un algorithme de montée de gradient projeté. Les résultats démontrent des améliorations de performance substantielles, même dans des conditions de perte de chemin élevée, due à la double réflexion par les RISs. Cette stratégie de déploiement augmente non seulement le gain de multiplexage spatial, mais aussi réduit la complexité de l'estimation de l'information sur l'état du canal.Dans la dernière partie, nous introduisons un nouveau cadre coopératif qui permet aux RIS de changer dynamiquement de rôle entre principal et intermédiaire. Cette double fonctionnalité permet des réponses flexibles d'une part aux évolutions environnementales et d'autre part aux besoins des utilisateurs, en optimisant dynamiquement les gains de multiplexage spatial ainsi que la couverture. La conception d'un codebook de focalisation pour chaque RIS et la mise en place de la politique de planification dynamique basées sur la théorie de l'optimisation de Lyapunov permettre de maintenir la stabilité des files d'attente de données des utilisateurs et d'optimiser les débits à long terme. La planification coopérative garantit que le gain de multiplexage spatial est dynamiquement transféré d'une région à une autre, offrant des performances MU-MIMO fiables tout au long de la cellule.À travers des études analytiques et de simulation rigoureuses, cette thèse fournit des perspectives pratiques sur le déploiement des RIS, soulignant le potentiel de la technologie RIS dans le but d'améliorer significativement les performances de communication sans fil. Les résultats soulignent l'impact important des RIS sur l'efficacité du réseau, la couverture et l'expérience utilisateur, ouvrant la voie à la prochaine génération de systèmes de communication sans fil
The rapid advancement of wireless communication technologies has been driven by the increasing demand for higher data rates, better coverage, and more efficient spectrum utilization. As we transition towards the Sixth Generation (6G) of wireless networks, innovative technologies such as Reconfigurable Intelligent Surfaces (RIS) and Massive MIMO (mMIMO) are set to play crucial roles in meeting these demands. This thesis explores the integration of RIS with mMIMO systems to enhance wireless communication performance, particularly in Multi-User MIMO (MU-MIMO) scenarios.In the first part of the thesis, we focus on the application of Joint Spatial Division and Multiplexing (JSDM) in RIS-aided MU-MIMO systems. By strategically positioning RIS near users with weak direct Base Station (BS) channels, we develop solutions to adapt JSDM user clustering algorithms for RIS configurations. This approach leverages spatial signatures and introduces an additional precoding stage to JSDM mitigating the adverse effects of the RIS-BS channel, significantly improving the sum rate and system coverage. The proposed solutions demonstrate the potential of RIS to enhance coverage by establishing robust links between the BS and users, thereby improving overall network performance.The second part of the thesis addresses the challenge of low-rank BS-RIS channels by proposing a distributed RIS system. By deploying intermediate RISs between the BS and a main RIS, we create an integrated channel with enhanced rank characteristics, suitable for serving multiple users simultaneously. The performance of this paradigm is analyzed under Regularized Zero Forcing (RZF) and JSDM precoding, with RIS phase shifts optimized through a projected gradient ascent algorithm. The results demonstrate substantial performance improvements, even under high double reflection path-loss conditions. This innovative deployment strategy not only increases the spatial multiplexing gain but also reduces the complexity of channel state information (CSI) estimation.In the final part, we introduce a novel cooperative RIS framework that allows RISs to dynamically switch roles between main and intermediate. This dual functionality enables flexible responses to changing environmental conditions and user requirements, optimizing spatial multiplexing gains and overall coverage. We design a focusing codebook for each RIS and develop dynamic scheduling policies based on Lyapunov optimization theory to maintain user data queue stability and optimize long-term user data rates. The cooperative scheduling framework ensures that the spatial multiplexing gain is dynamically shifted from one region to another, providing reliable MU-MIMO performance throughout the cell.Through rigorous analytical and simulation studies, this thesis provides practical insights into the deployment of RIS in future 6G networks, highlighting the potential of RIS technology to significantly enhance wireless communication performance. The findings underscore the transformative impact of RIS on network efficiency, coverage, and user experience, paving the way for the next generation of wireless communication systems

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Schmeink, Kathrin [Verfasser]. « Joint Communication and Positioning based on Interleave-Division Multiplexing / Kathrin Schmeink ». Aachen : Shaker, 2012. http://d-nb.info/1052408028/34.

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Xu, Guoda, John Bartha, Sean Zhang, Wei Qiu, Freddie Lin, Stuart McNamee et Larry Rheaume. « Electro-Optic Hybrid Rotary Joint (EOHRJ) ». International Foundation for Telemetering, 2000. http://hdl.handle.net/10150/606501.

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International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California
An advanced electro-optic hybrid rotary joint (EOHRJ) has been developed in Phase II of an AF SBIR effort with Physical Optics Corporation (POC) to replace cable wrap structure for multi-channel rotation-to-fixed (RTF) signal transmission. The EOHRJ meets AFFTC and other range special needs with a generic, high performance, rotary joint solution. At the moment, we have successfully installed and tested the EOHRJ on our KTM tracker system with the following capabilities: 1) able to accommodate hundreds of transmission channels, including electrical power, control, feedback, and low-speed signals; 2) able to accommodate multiple channel, high data rate (over gigabits per second), and bi-directional signal transmission; 3) able to be reliable for harsh environmental operation, adaptive to stringent sized requirement, and accommodating existing electrical and mechanical interfaces. The completed EOHRJ contains three uniquely integrated functional rings. The first and the outmost one is power ring, which provides RTF transmission channels for over 50 high voltage and high current channels. The second and the middle one is low speed electrical signal ring, which provides RTF transmission for over hundred control, feedback, and low speed data signals. The third and the inmost one is optical fiber slip ring, which, incorporating with current advanced signal multiplexing technologies (either time division or wavelength division multiplexing ) is able to provide multiple channel, high data rate, and bi-directional signal transmission. At the moment, the prototype module of the tree-layer EOHRJ has been successfully assembled in Air Force’s tracker system, and is providing a satisfactory performance. This paper presents our joint work on this project.

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Riesen, Nicolas. « Spatial mode-division multiplexing and advanced distributed fibre sensing techniques ». Phd thesis, Canberra, ACT : The Australian National University, 2014. http://hdl.handle.net/1885/125032.

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Part A: Spatial Mode-Division Multiplexing: As the capacity limits of single-mode optical fibre are being approached, attention has shifted to few-mode fibre. Increasing capacity then amounts to independently exciting and detecting the various spatial modes, in what is known as spatial mode-division multiplexing. In this approach each mode acts as a different data channel. The independent excitation and detection of the individual spatial modes however remains a major technological challenge, and at present experimental demonstrations have relied on lossy bulk free-space optics. In this thesis, simpler and more compact waveguide-based alternatives are proposed and analysed. Firstly, it is shown that asymmetric Y-junctions can be used to adiabatically multiplex/demultiplex the modes of polarization-maintaining or elliptical-core few-mode fibre. Analytical models describing the mode-selective functionality of these devices are developed and it is shown numerically that the performance is largely independent of wavelength, hence permitting wideband wavelength-division multiplexing. Another class of compact waveguide-based devices suitable for mode-division multiplexing are mode-selective couplers. Coupled mode theory is used to develop an analytical model of these devices, and it is shown that specific three-core variants permit demultiplexing of asymmetric higher-order modes irrespective of modal orientation. The wavelength-dependence of these couplers is however shown to limit their use in wavelength-division multiplexed systems. In order to solve the wavelength-dependence issue of these couplers, adiabatic tapers can be introduced into the cores. Such structures are referred to as tapered velocity mode-selective couplers, and unlike standard directional mode-couplers, these novel devices do not require precise phase conditions to be satisfied over an extended length. For this reason they permit ultra-wideband mode-division multiplexing of few-mode fibre. It is again shown that three-core variants of these tapered couplers can permit mode-orientation independent decoupling. These devices are numerically analyzed, and their successful fabrication using the femtosecond-laser direct write technique is also reported. These developments could play a very significant role in future high-capacity telecommunications. Part B: Advanced Distributed Fibre Sensing Techniques: Distributed optical fibre sensing techniques are invariably plagued by trade-offs between the performance metrics of range, spatial resolution and measurement bandwidth. This is especially true for the most well-known frequency domain and time domain fibre sensing techniques of optical frequency domain reflectometry (OFDR) and optical time domain reflectometry (OTDR), respectively. What is needed to lessen the performance trade-offs, is a hybrid technique using both time and frequency domain signal analysis. The merging of the realms of time and frequency domain fibre sensing is demonstrated in this thesis using a range-gated variant of OFDR. The range-gating is achieved by time stamping the optical signal using high-frequency pseudorandom noise phase modulation, also known as digitally enhanced interferometry. The merging of digital interferometry and OFDR is referred to as digitally enhanced OFDR. This technique permits orders of magnitude reduction in the required sampling rates of OFDR, and overcomes the range ambiguity inherent in OFDR when sensing over multiple frequency sweeps. The latter feature means the technique can be used for ultra-high (e.g. acoustic) bandwidth sensing without sacrificing range or spatial resolution.

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Schreiber, Kathrin [Verfasser]. « Joint Communication and Positioning based on Interleave-Division Multiplexing / Kathrin Schreiber (geb. Schmeink) ». Kiel : Universitätsbibliothek Kiel, 2013. http://d-nb.info/1031421440/34.

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Tan, Kim Leong. « Dynamic holography using ferroelectric liquid crystal on silicon spatial light modulators ». Thesis, University of Cambridge, 1999. https://www.repository.cam.ac.uk/handle/1810/251678.

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Xu, Guoda, John M. Bartha, Stuart McNamee, Larry Rheaume et Allen Khosrowabadi. « OPTICAL SLIP-RING CONNECTOR ». International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/607336.

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International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada
Current ground-based tracking systems at the DoD test and training ranges require transmission of a variety of signals from rotating platform to fixed control and process center. Implementation of commercial off the shelf (COTS) solution for transmitting high-speed, multiple-channel data signals over a rotational platform prompt the development of an advanced electro-optic hybrid rotating-to-fixed information transmission technology. Based on current demand, an Air Force-sponsored Small Business Innovative Research (SBIR) contract has been awarded to Physical Optics Corporation (POC) to modify existing tracking mounts with a unique electro-optic hybrid rotary joint (EOHRJ). The EOHRJ under current development is expected to provide the following features: 1) include a specially designed electrical slip-ring, which is able to accommodate hundreds of transmission channels, including electrical power, control, feedback, and low-speed data signals; 2) include an optical fiber slip-ring which, by incorporating with electrical time division mulitplexing (TDM) and optical wavelength division multiplexing (WDM) technologies, is able to provide multiple channel, high data rate (over gigabits per second), and bi-directional signal transmission; and 3) is designed to be reliable for harsh environmental operation, adaptive to stringent size requirement, and accommodating to existing electrical and mechanical interfaces. Besides the military use, other possible commercial applications include on board monitoring of satellite spinners, surveillance systems, instrumentation and multi spectral vision systems, emergency/medical instruments, remote sensing, and robotics.

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Brunet, Charles. « Design and modeling of optical fibers for spatial division multiplexing using the orbital angular momentum of light ». Doctoral thesis, Université Laval, 2016. http://hdl.handle.net/20.500.11794/26996.

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Les besoins toujours croissants en terme de transfert de données numériques poussent au développement de nouvelles technologies pour accroître la capacité des réseaux, notamment en ce qui concerne les réseaux de fibre optique. Parmi ces nouvelles technologies, le multiplexage spatial permet de multiplier la capacité des liens optiques actuels. Nous nous intéressons particulièrement à une forme de multiplexage spatial utilisant le moment cinétique orbital de la lumière comme base orthogonale pour séparer un certain nombre de canaux. Nous présentons d’abord les notions d’électromagnétisme et de physique nécessaires à la compréhension des développements ultérieurs. Les équations de Maxwell sont dérivées afin d’expliquer les modes scalaires et vectoriels de la fibre optique. Nous présentons également d’autres propriétés modales, soit la coupure des modes, et les indices de groupe et de dispersion. La notion de moment cinétique orbital est ensuite introduite, avec plus particulièrement ses applications dans le domaine des télécommunications. Dans une seconde partie, nous proposons la carte modale comme un outil pour aider au design des fibres optiques à quelques modes. Nous développons la solution vectorielle des équations de coupure des modes pour les fibres en anneau, puis nous généralisons ces équations pour tous les profils de fibres à trois couches. Enfin, nous donnons quelques exemples d’application de la carte modale. Dans la troisième partie, nous présentons des designs de fibres pour la transmission des modes avec un moment cinétique orbital. Les outils développés dans la seconde partie sont utilisés pour effectuer ces designs. Un premier design de fibre, caractérisé par un centre creux, est étudié et démontré. Puis un second design, une famille de fibres avec un profil en anneau, est étudié. Des mesures d’indice effectif et d’indice de groupe sont effectuées sur ces fibres. Les outils et les fibres développés auront permis une meilleure compréhension de la transmission dans la fibre optique des modes ayant un moment cinétique orbital. Nous espérons que ces avancements aideront à développer prochainement des systèmes de communications performants utilisant le multiplexage spatial.
The always increasing need for digital data bandwidth pushes the development of emerging technologies to increase network capacity, especially for optical fiber infrastructures. Among those technologies, spatial multiplexing is a promising way to multiply the capacity of current optical links. In this thesis, we are particularly interested in current spatial multiplexing using the orbital angular momentum of light as an orthogonal basis to distinguish between a few optical channels. We first introduce notions from electromagnetism and physic needed for the understanding of the later developments. We derive Maxwell’s equations describing scalar and vector modes of optical fiber. We also present other modal properties like mode cutoff, group index, and dispersion. Orbital angular momentum is briefly explained, with emphasis on its applications to optical communications. In the second part, we propose the modal map as a tool that can help in the design of few mode fibers. We develop the vectorial solution of the ring-core fiber cutoff equation, then we extend those equations to all varieties of three-layer fiber profiles. Finally, we give some examples of the use of the modal map. In the third part of this thesis, we propose few fiber designs for the transmission of modes with an orbital angular momentum. The tools that were developed in the second part of this thesis are now used in the design process of those fibers. A first fiber design, characterized by a hollow center, is studied and demonstrated. Then a second design, a family of ring-core fibers, is studied. Effective indexes and group indexes are measured on the fabricated fibers, and compared to numerical simulations. The tools and the fibers developed in this thesis allowed a deeper comprehension of the transmission of orbital angular momentum modes in fiber. We hope that those achievements will help in the development of next generation optical communication systems using spatial multiplexing.

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Tsai, Chiou-Wei, Richard E. Cagley et Ronald A. Iltis. « JOINT INTERFERENCE SUPPRESSION AND QRD-M DETECTION FOR SPATIAL MULTIPLEXING MIMO SYSTEMS IN A RAYLEIGH FADING CHANNEL ». International Foundation for Telemetering, 2006. http://hdl.handle.net/10150/604390.

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ITC/USA 2006 Conference Proceedings / The Forty-Second Annual International Telemetering Conference and Technical Exhibition / October 23-26, 2006 / Town and Country Resort & Convention Center, San Diego, California
Spatial multiplexing (SM) systems have received significant attention because the architecture offers high spectral efficiency. However, relatively little research exists on optimization of SM systems in the presence of jamming. In a spatially uncoded SM system, such as V-BLAST, the channel state information is assumed to be unavailable a priori at both transmitter and receiver. Here, Kalman filtering is used to estimate the Rayleigh fading channel at the receiver. The spatial correlation of the jammer plus noise is also estimated, and spatial whitening to reject the jammers is employed in both the Kalman channel estimator and detector. To avoid the exponential complexity of maximum-likelihood (ML) detection, the QRD-M algorithm is employed. In contrast to sphere decoding, QRD-M has fixed decoding complexity of order O(M), and is thus attractive for hardware implementation. The performance of the joint Kalman filter channel estimator, spatial whitener and QRD-M detector is verfied by simulations.

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Chapitres de livres sur le sujet "Joint Spatial Division and Multiplexing"

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Chen, Haoshuo, et A. M. J. Koonen. « Spatial Division Multiplexing ». Dans Springer Series in Optical Sciences, 1–48. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-42367-8_1.

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Ogura, Yusuke. « Spatial Photonic Ising Machine with Time/Space Division Multiplexing ». Dans Photonic Neural Networks with Spatiotemporal Dynamics, 153–74. Singapore : Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-5072-0_8.

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AbstractThe spatial photonic Ising machine (SPIM) is an unconventional computing architecture based on parallel propagation/processing with spatial light modulation. SPIM enables the handling of an Ising model using light as a pseudospin. This chapter presents SPIMs with multiplexing to enhance their functionality. Handling a fully connected Ising model with a rank-2 or higher spin-interaction matrix becomes possible with multiplexing, drastically improving its applicability in practical applications. We constructed and examined systems based on time- and space-division multiplexing to handle Ising models with ranks of no less than one while maintaining high scalability owing to the features of spatial light modulation. Experimental results with knapsack problems demonstrate that these methods can compute the Hamiltonian consisting of objective and constraint terms, which require multiplexing, and can determine the ground-state spin configuration. In particular, in space-division multiplexing SPIM, the characteristics of the solution search vary based on the physical parameters of the optical system. A numerical study also suggested the effectiveness of the dynamic parameter settings in improving the Ising machine performance. These results demonstrate the high capability of SPIMs with multiplexing.

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Yang, Song, Li Jianping et Cai Chaoshi. « An Improved Spatial Division Multiplexing of STBC Scheme Based on BICM ». Dans Advanced Technology in Teaching, 737–43. Berlin, Heidelberg : Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-29458-7_103.

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Behera, Bhagyalaxmi, S. K. Varshney et Mihir Narayan Mohanty. « Design and Modal Analysis of Few-Mode Fibers for Spatial Division Multiplexing ». Dans Lecture Notes in Networks and Systems, 152–60. Singapore : Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2774-6_19.

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Zhu, Ye, Yongli Zhao, Wei Wang, Xiaosong Yu, Guanjun Gao et Jie Zhang. « Self-homodyne Spatial Super-Channel Based Spectrum and Core Assignment in Spatial Division Multiplexing Optical Networks ». Dans Communications and Networking, 423–30. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-66625-9_41.

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Slock, Dirk T. M. « Blind Joint Equalization of Multiple Synchronous Mobile Users for Spatial Division Multiple Access ». Dans Information Technology : Transmission, Processing and Storage, 435–46. London : Springer London, 1996. http://dx.doi.org/10.1007/978-1-4471-1013-2_34.

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Bentham Science Publisher, Bentham Science Publisher. « Multiuser and Spatial Diversity in OFDM Systems with Co-channel Interference ». Dans Orthogonal Frequency Division Multiplexing with Diversity for Future Wireless Systems, 278–302. BENTHAM SCIENCE PUBLISHERS, 2012. http://dx.doi.org/10.2174/978160805188511201010278.

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Bentham Science Publisher, Bentham Science Publisher. « The Effects of Spatial Diversity on the Synchronization of MIMO-OFDM Systems ». Dans Orthogonal Frequency Division Multiplexing with Diversity for Future Wireless Systems, 1–44. BENTHAM SCIENCE PUBLISHERS, 2012. http://dx.doi.org/10.2174/978160805188511201010001.

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Rjeb, Alaaeddine, Habib Fathallah et Mohsen Machhout. « OAM Modes in Optical Fibers for Next Generation Space Division Multiplexing (SDM) Systems ». Dans Fiber Optics - Technology and Applications. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97773.

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Due to the renewed demand on data bandwidth imposed by the upcoming capacity crunch, optical communication (research and industry) community has oriented their effort to space division multiplexing (SDM) and particularly to mode division multiplexing (MDM). This is based on separate/independent and orthogonal spatial modes of optical fiber as data carriers along optical fiber. Orbital Angular Momentum (OAM) is one of the variants of MDM that showed promising features including the efficient enhancement of capacity transmission from Tbit to Pbit and substantial improvement of spectral efficiency up to hundreds (bs-1 Hz-1). In this chapter, we review the potentials of harnessing SDM as a promising solution for next generation global communications systems. We focus on different SDM approaches and we address specifically the MDM (different modes in optical fiber). Finally, we highlight the recent main works and achievements that have been conducted (in last decade) in OAM-MDM over optical fibers. We focus on main R&D activities incorporating specialty fibers that have been proposed, designed and demonstrating in order to handle appropriates OAM modes.

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Jee, Raman, et Somnath Chandra. « WDM-FSO system for 5G Wireless Network using spatial multiplexing in the presence of Wireless and Optical Nonlinearities ». Dans Free Space Optics Technologies in B5G and 6G Era - Recent Advances, New Perspectives and Applications. IntechOpen, 2024. http://dx.doi.org/10.5772/intechopen.1005124.

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This chapter focuses on theoretical analysis of the transmission performance of wavelength division multiplexed (WDM) free-space optical communication (FSO) links amidst optical and wireless nonlinearities. It has been shown that, to mitigate the nonlinearities due to atmospheric turbulence and optical path, spatial multiplexing technique has been utilized, coupled with advanced modulation formats such as CS-RZ, QPSK and DSPK, and QAM. An in-depth theoretical model and simulation study have been carried out. In the presence of strong and medium turbulence, our analysis indicates that modulation formats QAM, DPSK, and QPSK perform better than normal baseband CS-RZ. The analysis further shows that using spatial multiplexing (MIMO), QAM has a 5.1 dB advantage over CS-RZ and a 1.6 dB advantage over DPSK and QPSK modulations at the FEC threshold level of 3.8 × 10−3. The WDM-FSO system can transmit wireless signals up to a distance of 36 kilometers at the FEC threshold. Further, we have shown that a combination of the WDM-FSO system can transport wireless signals up to 36 km at the FEC threshold 3.8 × 10−3. Specifically, it has been demonstrated that the spectrally efficient QAM modulation format achieves higher transmission efficiency at FEC error rate 3.8 × 10−3.

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Actes de conférences sur le sujet "Joint Spatial Division and Multiplexing"

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Dainese, Paulo, Jaewon Oh, Jun Yang, Louis Marra, Ahmed H. Dorrah, Alfonso Palmieri et Federico Capasso. « Compact Spatial Division Multiplexing with Dielectric Metasurfaces ». Dans CLEO : Science and Innovations, SF1O.1. Washington, D.C. : Optica Publishing Group, 2024. http://dx.doi.org/10.1364/cleo_si.2024.sf1o.1.

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Compact, integrated, and scalable devices are critical for future high-density optical communication applications. Here, we review our recent results demonstrating di-electric metasurfaces devices for mode-division multiplexing in few-mode fibers and free-space coupling into multi-core fibers.

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Zhao, Tianfeng, Junpeng Liang, Jinlong Wei, Feng Wen, Qi Wu et Bo Xu. « In-service Core Identification for Multi-core Fiber-based Spatial-division Multiplexing Systems ». Dans 2024 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR), 1–2. IEEE, 2024. http://dx.doi.org/10.1109/cleo-pr60912.2024.10676940.

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Savaux, Vincent, et Xuan Chen. « Spatial Precoding in Frequency Domain for Multi-User MIMO Affine Frequency Division Multiplexing ». Dans 2024 32nd European Signal Processing Conference (EUSIPCO), 2112–16. IEEE, 2024. http://dx.doi.org/10.23919/eusipco63174.2024.10714978.

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Hussein, Youssef, Mohamad Assaad et Thierry Clessienne. « Distributed RIS-aided Joint Spatial Division and Multiplexing ». Dans 2023 IEEE 34th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC). IEEE, 2023. http://dx.doi.org/10.1109/pimrc56721.2023.10293993.

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Hussein, Youssef, Mohamad Assaad et Thierry Clessienne. « Reconfigurable Intelligent Surfaces-aided Joint Spatial Division and Multiplexing for MU-MIMO Systems ». Dans ICC 2022 - IEEE International Conference on Communications. IEEE, 2022. http://dx.doi.org/10.1109/icc45855.2022.9838384.

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Wang, Xiyuan, Zhongshan Zhang, Keping Long et Xian-Da Zhang. « Joint group power allocation and prebeamforming for joint spatial-division multiplexing in multiuser massive MIMO systems ». Dans ICASSP 2015 - 2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP). IEEE, 2015. http://dx.doi.org/10.1109/icassp.2015.7178508.

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Nam, Junyoung, et Jae-Young Ahn. « Joint spatial division and multiplexing — ; Benefits of antenna correlation in multi-user MIMO ». Dans 2013 IEEE International Symposium on Information Theory (ISIT). IEEE, 2013. http://dx.doi.org/10.1109/isit.2013.6620300.

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Nam, Junyoung, Jae-Young Ahn, Ansuman Adhikary et Giuseppe Caire. « Joint spatial division and multiplexing : Realizing massive MIMO gains with limited channel state information ». Dans 2012 46th Annual Conference on Information Sciences and Systems (CISS). IEEE, 2012. http://dx.doi.org/10.1109/ciss.2012.6310934.

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Tahara, Tatsuki, Toru Kaku et Yasuhiko Arai. « Single-shot color digital holography based on spatial frequency-division multiplexing and space-bandwidth capacity-enhance ». Dans JSAP-OSA Joint Symposia. Washington, D.C. : OSA, 2014. http://dx.doi.org/10.1364/jsap.2014.20a_c4_6.

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Leroy, A., P. Marchal, A. Shickova, F. Catthoor, F. Robert et D. Verkest. « Spatial division multiplexing ». Dans the 3rd IEEE/ACM/IFIP international conference. New York, New York, USA : ACM Press, 2005. http://dx.doi.org/10.1145/1084834.1084858.

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Rapports d'organisations sur le sujet "Joint Spatial Division and Multiplexing"

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Daras, Ilias, Gûnther March, Joint Mass Chnge Mission Expert Group, D. Wiese, C. Blackwood, F. Forman, B. Loomis et al. Next Generation Gravity Mission (NGGM) Mission Requirements Document. ESA, septembre 2023. http://dx.doi.org/10.5270/esa.nggm-mrd.2023-09-v1.0.

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The Next Generation Gravity Mission (NGGM) is a Mission of Opportunity as part of ESA’s FutureEO programme. NGGM will extend and improve time series of satellite gravity missions by providing enhanced spatial and temporal resolution time-varying gravity field measurements with improved performance and and latency. The mission addresses international user needs as expressed by IUGG and GCOS and demonstrates operational capabilities relevant for Copernicus. The NGGM Mission Requirement Document (MRD) defines unambiguous requirements for NGGM, traceable to the joint ESA/NASA MAss Change and Geosciences International Constellation (MAGIC) MRD (c.f. MAGIC MRD), and provides recommendations for MAGIC. MAGIC will combine the NASA/DLR GRACE-C (former Mass Change) mission as a first pair of satellites in a near-polar orbit, complemented by the ESA NGGM mission as a second pair of satellites in an inclined controlled orbit (Bender constellation), to deliver significantly improved time-space sampling and constellation performance to demonstrate the benefits of operational gravimetry. The NGGM MRD v1.0 was issued in September 2023 at the end of NGGM Phase A. Further revisions are expected in the upcoming phases of development. Citation Daras, I. (Ed), 2023, Next Generation Gravity Mission (NGGM) Mission Requirements Document, Issue 1.0, Earth and Mission Science Division, European Space Agency, https://doi.org/10.5270/ESA.NGGM-MRD.2023-09-v1.0

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