Literatura académica sobre el tema "Reconfigurable Intelligent Surfaces (RIS)"
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Artículos de revistas sobre el tema "Reconfigurable Intelligent Surfaces (RIS)"
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Wang, Wenhe, and Kang Song. "Hybrid Active–Passive Reconfigurable Intelligent Surface for Cooperative Transmission Systems." Applied Sciences 14, no. 1 (2023): 231. http://dx.doi.org/10.3390/app14010231.
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Reconfigurable intelligent surfaces (RISs) are acknowledged as one of the key technologies for the next-generation communications systems due to their low cost, high-energy efficiency, and the ability to intelligently control the wireless propagation environment. In this paper, we present a hybrid active–passive reconfigurable intelligent surface (HAPR) for cooperative transmission system, where HAPR can intelligently change its operating mode according to the channel environment, eliminating the “multiplicative fading” effect of traditional passive RIS (P-RIS) and higher power consumption of active RIS (A-RIS), and combining the advantages of both to effectively improve the system performance. First, we investigate the ideal reflection coefficient of RIS reflecting elements (REs) under the condition of a limited power budget. Using the compound Simpson formula, the closed-form approximation expression for the system outage probability (OP) has been derived. Finally, Monte Carlo simulation is used to confirm the accuracy of the expression. The simulation results demonstrate that HAPR has a better performance than both A-RIS and P-RIS, which can achieve a lower OP.
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Rana, Biswarup, Sung-Sil Cho, and Ic-Pyo Hong. "Parameters and Measurement Techniques of Reconfigurable Intelligent Surfaces." Micromachines 13, no. 11 (2022): 1841. http://dx.doi.org/10.3390/mi13111841.
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Reconfigurable intelligent surface (RIS)-aided wireless communications systems are one the promising wireless communication system where the wave can be guided by the RIS. It is envisioned that beyond-5G/6G communication will have a low-cost, high spectral efficiency, high energy efficiency, and smart wireless environment. In this paper, initially, different measurement techniques of the RIS have been discussed, which are available in the literature. Then, a new type of RIS has been proposed. Finally, a different parameter measurement technique for our proposed RIS has been presented. A low-cost FR4 substrate with a height of 1.6 mm was considered to design the RIS in the sub-6 GHz frequency band. Another important thing is that our proposed IRS is a single-layer substrate backed by a copper plate. The area of each unit cell was 42 mm × 42 mm. The RIS was designed to operate at the central frequency of the 3.5 GHz frequency band. The novelty of the proposed RIS is that it is a polarization-independent structure. Thus, polarization-related losses can be overcome using this structure. A 10×10-unit cell array was designed to check the radiation performance. The magnitude of the reflection coefficients was measured in our laboratory for the proposed configuration.
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Ni, Li, Yonggang Zhu, and Wenlong Guo. "Controllable Multiple Active Reconfigurable Intelligent Surfaces Assisted Anti-Jamming Communication." Electronics 12, no. 18 (2023): 3933. http://dx.doi.org/10.3390/electronics12183933.
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Traditional anti-jamming techniques such as frequency hopping (FH) and direction-sequence spread spectrum (DSSS) are easily targeted by jammers. Inspired by the significant advantages of reconfigurable intelligent surfaces (RIS), and in order to overcome “double fading”, controllable multiple active RISs are proposed to explore anti-jamming communication in this paper. To verify the feasibility of active RIS, the anti-jamming performance of active RIS is analyzed through theoretical derivation and simulation and compared with passive RIS. Furthermore, to solve the optimization problem of active RIS, a controllable multi-active RIS assisted anti-jamming algorithm based on BCD is proposed. Theoretical analysis and simulation results show that in small-scale deployment scenarios of RIS, the anti-jamming performance of active RIS is better than that of passive RIS, and the complexity and optimization performance of the proposed algorithm are better than those of semidefinite relaxation (SDR) algorithms.
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Nguyen, Nhan Duc, Minh-Sang Van Nguyen, and Munyaradzi Munochiveyi. "Empowering Reconfigurable Intelligent Surfaces for Security of Downlink NOMA." Wireless Communications and Mobile Computing 2022 (May 25, 2022): 1–15. http://dx.doi.org/10.1155/2022/1498918.
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Reconfigurable intelligent surfaces (RIS) and non-orthogonal multiple access (NOMA) are promising techniques to develop next-generation wireless systems. While RIS has huge potential to create massive device connectivity, NOMA exhibits its spectrum efficient communication among multiple access approaches. RIS is a passive device made up of low-cost meta-surfaces which can control the propagation of radio waves, and it is easily deployable in lots of applications in the Internet of Things. The full-duplex nature of RIS has also been a major reason for its consideration of major emerging and trending technologies. In this paper, we aim to investigate the secrecy performance of the RIS-NOMA-assisted Internet of Things (IoT) systems in the presence of two legitimate users who belong to a cluster, and those devices are associated with the existence of an eavesdropper situated close to such a cluster. This paper considers the devices in the presence of RIS and an eavesdropper. As main performance metrics, the closed-form expressions for secrecy outage probability (SOP) and strictly positive secrecy capacity (SPSC) are derived to evaluate the performance of legitimate users. Simulations are performed in support of the Monte-Carlo method, and the obtained results show that in most of the cases, the number of meta-surfaces in RIS and signal-to-noise ratio (SNR) levels at the source also plays a pivotal role in influencing the secure performance of the system.
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UmaMaheswari, Kaveti, Arjun Chakravarthi Pogaku, Dinh-Thuan Do, Anh-Tu Le, and Munyaradzi Munochiveyi. "Improving Performance of User Pair Using Reconfigurable Intelligent Surfaces." Wireless Communications and Mobile Computing 2021 (December 23, 2021): 1–12. http://dx.doi.org/10.1155/2021/2036778.
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With the given scope for new use cases and the demanding needs of future 6th generation (6G) wireless networks, the development of wireless communications looks exciting. The propagation medium has been viewed as a randomly behaving entity between the transmitter and the receiver since traditional wireless technology, degrading the quality of the received signal due to the unpredictable interactions of the broadcast radio waves with the surrounding objects. On the other hand, network operators could now manipulate electromagnetic radiation to remove the negative impacts of natural wireless propagation due to the recent arrival of reconfigurable intelligent surfaces (RIS) in wireless communications. According to recent findings, the RIS mechanism benefits nonorthogonal multiple access (NOMA), which can effectively deliver effective transmissions. For simple design, of RIS-NOMA system, fixed power allocation scheme for NOMA is required. The main system performance metric, i.e., outage probability, needs to be considered to look at the efficiency and capability of transmission mode relying on RIS and NOMA schemes, motivated by the potential of these developing technologies. As major performance metrics, we derive analytical representations of outage probability, and throughput and an accurate approximation is obtained for the outage probability. Numerical results are conducted to validate the exactness of the theoretical analysis. It is found that increasing the higher number of reflecting elements in the RIS can significantly boost the outage probability performance, and the scenario with only the RIS link is also beneficial. In addition, it is desirable to deploy the RIS-NOMA since it is indicated that better performance compared with the traditional multiple access technique.
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Liu, Yiping, Jianwu Dou, Yijun Cui, et al. "Reconfigurable Intelligent Surface Physical Model in Channel Modeling." Electronics 11, no. 17 (2022): 2798. http://dx.doi.org/10.3390/electronics11172798.
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Reconfigurable intelligent surfaces (RISs) are one of the potential technologies for 6th generation (6G) mobile communication systems with superior electromagnetic (EM) wave-steering capability to effectively control the phase, amplitude, and polarization of the incident EM wave. An implementation-independent physical RIS model with key EM characteristics is especially crucial to RIS channel modeling considering the trade-off between complexity and accuracy. In this paper, a reflective RIS physical model is proposed to facilitate channel modeling in a system simulation. Based on the impinging EM wave of the last bounce to the RIS, the scattering field intensity of the target point is obtained using geometric optics and the electric field surface integration method of physical optics. The feasibility of the model is verified by a comparison of the simulation and test results.
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Patra, Radhashyam, and Arunanshu Mahapatro. "Reconfigurable Intelligent Surface-based Propagation Control in FBMC/OQAM Systems." Journal of Telecommunications and Information Technology, no. 1 (February 28, 2024): 83–90. http://dx.doi.org/10.26636/jtit.2024.1.1326.
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In this paper, transmission of filter bank multi-carrier (FBMC) modulated signal through reconfigurable intelligent surfaces (RIS) is proposed as an assuring technique for future wireless communication. RIS deliberately alters phases of incident signals to enhance quality of the received signal. Simulation outcomes show that it is possible to establish RIS-based FBMC communications in which RIS functions as an intelligent reflector with information concerning channel phases. It is observed that RIS-based FBMC transmissions may be a prospective solution for beyond 5G communication.
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Demmer, David, Francesco Foglia Manzillo, Samara Gharbieh, et al. "Hybrid Precoding Applied to Multi-Beam Transmitting Reconfigurable Intelligent Surfaces (T-RIS)." Electronics 12, no. 5 (2023): 1162. http://dx.doi.org/10.3390/electronics12051162.
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In this work, we study hybrid precoding techniques applied to multi-user Transmitting Reconfigurable Intelligent Surface (T-RIS) systems. The T-RIS considered here is a large array of electronically reconfigurable antenna elements illuminated by a small set of active sources. When it comes to digital signal-processing techniques applied to T-RIS systems, it is necessary to consider realistic models to bridge the gap with theoretical results. For this reason, we propose a multi-beam T-RIS propagation model with strong phase quantization constraints and limited beam codebooks. First, the proposed model is validated by characterizing a Ka-band T-RIS. Then, we optimize the quad-beam T-RIS structure by tuning the focal distance between the lens and the focal sources according to two metrics: (i) the per-user antenna gain (analog-only approach), and (ii) the per-user average rate (hybrid digital/analog approach). For both indicators, the system performance is evaluated in a multi-user scenario by assuming imperfect channel state information. We show that considering only the analog precoder is sufficient to optimize the T-RIS. However, the fully hybrid precoding scheme is required to deal with inter-user interference. We propose a codebook-aware optimization that improves the aperture efficiency of the T-RIS system.
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Rana, Biswarup, Sung-Sil Cho, and Ic-Pyo Hong. "Passive Type Reconfigurable Intelligent Surface: Measurement of Radiation Patterns." Micromachines 14, no. 4 (2023): 818. http://dx.doi.org/10.3390/mi14040818.
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The demand for unprecedented data and ubiquitous wireless connections have led to the adoption of new types of transmitters and receivers. Additionally, different new types of devices and technologies need to be proposed for such demand. Reconfigurable intelligent surface (RIS) is going to play a very significant role in the upcoming beyond-5G/6G communications. It is envisioned that not only the RIS will be deployed to assist and create a smart wireless environment for the upcoming communications, but also the receiver and transmitter can be fabricated using RIS to make a smart and intelligent transmitter and receiver. Thus, the latency of upcoming communications can be reduced very significantly using RIS, which is a very important factor. Artificial intelligence assists communications and shall be adopted widely for the next generation networks. In this paper, radiation pattern measurement results of our previously published RIS have been provided. This work is the extension work of our previously proposed RIS. The polarization-independent passive type of RIS working in the sub-6 GHz frequency band using low-cost FR4-substrate was designed. Each unit cell with dimensions of 42 mm × 42 mm had a single-layer substrate backed by a copper plate. A 10 × 10-unit cell array was fabricated to check the performance of the RIS. Such types of unit cells and RIS were designed to set up initial measurement facilities in our laboratory for any kinds of RIS measurements.
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Goh, Chi Yen, Chee Yen Leow, and Rosdiadee Nordin. "Energy Efficiency of Unmanned Aerial Vehicle with Reconfigurable Intelligent Surfaces: A Comparative Study." Drones 7, no. 2 (2023): 98. http://dx.doi.org/10.3390/drones7020098.
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Unmanned aerial vehicles (UAVs) and reconfigurable intelligent surfaces (RIS) are the promising emerging technologies proposed for the 6th-Generation (6G) network to improve the capacity, reliability, and coverage of wireless communications. By integrating the UAV with RIS (RIS-UAV), the three-dimensional (3D) mobility of the UAV can be leveraged to establish strong line-of-sight links with the ground nodes, while the RIS intelligently reflect the signals toward the desired directions. However, the existing literature on RIS-UAV systems mainly assumes the use of passive elements, which suffers from the double path-loss problem. The use of active elements in RIS, which could improve the reflected link performance at the cost of increased energy consumption, has not been considered for the RIS-UAV system. Further, the energy efficiency of a RIS-UAV with active elements remains as an open direction because there is a need to investigate the feasibility of either an active or hybrid RIS-UAV implementation. This paper proposes active and hybrid RIS-UAVs and investigates the energy efficiencies of active and hybrid RIS-UAVs in comparison with existing passive RIS-UAVs and conventional UAV relays. The numerical results reveal that the proposed hybrid and active RIS-UAV relaying schemes can provide up to 14 times and 26 times improvement as compared to the passive RIS-UAV, respectively. As opposed to the active RIS-UAV that requires a larger power budget, half-duplex UAV relays that have a lower spectral efficiency, and full-duplex UAV relays that suffer from self-interference, the hybrid RIS-UAV emerges as a promising option to assist the ground communication system.
Tesis sobre el tema "Reconfigurable Intelligent Surfaces (RIS)"
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Liu, Yicong. "A Dynamic Subarray Structure in Reconfigurable Intelligent Surfaces for TeraHertz Communication Systems." Thesis, The University of Sydney, 2022. https://hdl.handle.net/2123/29611.
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Reconfigurable Intelligent Surfaces (RIS) have recently gained popularity as a TeraHertz (THz) multi-input multi-output (MIMO) communication solution. THz range (0.1-10 THz) is critical for ubiquitous wireless communications. THz frequencies, in particular, promise to provide sufficient spectrum, data rates exceeding a hundred gigabits per second (Gbps), huge interconnectedness, denser networks, and highly secure communications. While a higher carrier frequency entails a larger communication path loss. To lower it, the primary option is to improve the reflecting signal, and RIS has several benefits that make it a good candidate for THz communication.
When the size of a Base Station (BS) antenna is constant, a larger RIS array can boost spectral efficiency, according to earlier studies. However, if the RIS is significantly larger than the BS, the BS beam will not cover the entire RIS array. So there is a trade-off between the spectral efficiency and the number of RIS elements where RIS utilization is maximal.
Different from finding out the appropriate amount of RIS elements in a system, optimizing the RIS reflecting pattern to improve the coverage of BS beams and raise the system spectral efficiency is another technical route. Based on that, on the one hand, we separate the whole RIS array into some of subarrays, and each subarray aligns to only one corresponding user, making RIS-subarray-user pairs in a multiuser THz communication system. On the other hand, a system with a general RIS structure where the RIS reflects beams to all users without subarray is considered as a comparison.
Each RIS subarray independently reflects the beam to the corresponding user in this system. We settle it because if the size of RIS is much larger than the BS array, the beams from BS to RIS will hardly cover all RIS elements, and the utilization rate of RIS will be lower down.
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Mohamed, Abdelhamed. "Optimization Techniques for Reconfigurable Intelligent Surfaces Assisted Wireless Networks." Electronic Thesis or Diss., université Paris-Saclay, 2022. http://www.theses.fr/2022UPAST137.
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Récemment, l'émergence des surfaces intelligentes reconfigurables (RIS) a suscité une vive attention de l'industrie et du monde universitaire. Un RIS est une surface plane constituée d'un grand nombre d'éléments réfléchissants passifs à faible coût. En ajustant soigneusement les déphasages des éléments réfléchissants, un RIS peut remodeler l'environnement sans fil pour une meilleure communication. En général, cette thèse fournit des contributions sur : (i) les performances des RIS basées sur des modèles de rayonnement électromagnétique précis et réalistes. De plus, elle fournit des cadres d'optimisation pour améliorer la performance des systèmes de communication dans les deux cas d'utilisation suivants : (i) Améliorer conjointement le taux d'information et la quantité de puissance récoltée dans un réseau sans fil multi-utilisateurs MISO descendant assisté par les RIS. (ii) améliorer l'efficacité spectrale pour un grand nombre d'utilisateurs situés en bordure de cellule ou de l'autre côté du RIS en utilisant des omni-surfaces intelligentes (IOS). Le chapitre 1 présente les défis à relever pour répondre aux exigences des réseaux 6G, le concept d'environnements radio intelligents et les RIS, qui constituent l'une des technologies habilitantes. Dans les communications futures, les RIS sont une technique clé qui aura des applications potentielles permettant d'obtenir une connectivité sans faille tout en consommant moins d'énergie. Le chapitre 2 présente les systèmes de communication assistés par RIS. Le principe de réflexion, le problème d'estimation de canal et le problème de conception du système sont présentés en détail. Les recherches de pointe sur les problèmes d'estimation de canal et de conception de système sont passées en revue. Le chapitre 3 étudie l'impact de modèles de reradiation réalistes pour les RIS en fonction de l'inter-distance sub-longueur d'onde entre les éléments proches du RIS, les niveaux de quantification des coefficients de réflexion, l'interaction entre l'amplitude et la phase des coefficients de réflexion, et la présence d'interférences électromagnétiques. En conclusion, notre étude montre que, en raison de contraintes de conception, telles que la nécessité d'utiliser des coefficients de réflexion quantifiés ou l'interaction inhérente entre la phase et l'amplitude des coefficients de réflexion, un RIS peut reradir la puissance vers des directions non désirées qui dépendent des ondes électromagnétiques prévues et interférentes. Le chapitre 4 aborde le problème de l'optimisation simultanée du taux d'information et de la puissance récoltée dans un réseau sans fil multi-utilisateurs MISO en liaison descendante avec surface intelligente reconfigurable (RIS) et transfert simultané d'information et de puissance sans fil (SWIPT). Un algorithme pratique est développé par une interaction entre l'optimisation alternée, l'optimisation séquentielle et les méthodes basées sur les prix. Le chapitre 5 propose un algorithme d'optimisation qui a un taux de convergence rapide en quelques itérations pour maximiser le taux de somme dans les canaux de diffusion MIMO assistés par IOS, qui peut être exploité pour servir l'utilisateur de bord de cellule et améliorer la couverture du réseau. La particularité de ce travail est de considérer que les coefficients de réflexion et de transmission d'un IOS sont étroitement couplés. Enfin, le chapitre 6 résume les principales conclusions de la thèse et discute des orientations futures possibles qui méritent d'être étudiées pour libérer tout le potentiel des RIS et les mettre en pratique<br>Recently, the emergence of reconfigurable intelligent surface (RIS) has attracted heated attention from both industry and academia. An RIS is a planar surface that consists of a large number of low-cost passive reflecting elements. By carefully adjusting the phase shifts of the reflecting elements, an RIS can reshape the wireless environment for better communication. In general, this thesis provides contributions on: (i) the performance of RISs based on accurate and realistic electromagnetic reradiation models. Moreover, it provides some of optimization frameworks for enhancing the communication system performance on the following two use case: (i) To jointly improves the information rate and the amount of harvested power in a RIS-aided MISO downlink multiuser wireless network. (ii) enhancing spectral efficiency for large number of users located on cell edge or on the other side of the RIS by utilizing the intelligent omni-surfaces (IOSs).Chapter 1 introduces the challenges of fulfilling the requirements of of 6G networks, the concept of smart radio environments and RIS as it is one of the enabling technologies. In future communications, RIS is a key technique that will have potential applications which will achieve seamless connectivity and less energy consumption at the same time. Chapter 2 also introduces the state-of-art optimization techniques developed for RIS-aided systems. Firstly, it introduces the system models of RIS-aided MIMO systems and then investigates the reflection principle of RISs. In addition, it introduces the Optimization techniques challenges of RIS-assisted systems. Also, the proposed optimization techniques for designing the continuous and discrete phase shifts are presented in detail. Chapter 3 studies the impact of realistic reradiation models for RISs as a function of the sub-wavelength inter-distance between nearby elements of the RIS, the quantization levels of the reflection coefficients, the interplay between the amplitude and phase of the reflection coefficients, and the presence of electromagnetic interference. In conclusion, our study shows that, due to design constraints, such as the need to use quantized reflection coefficients or the inherent interplay between the phase and the amplitude of the reflection coefficients, a RIS may reradiate power towards unwanted directions that depend on the intended and interfering electromagnetic waves. Chapter 4 considers the problem of simultaneously optimizing the information rate and the harvested power in a reconfigurable intelligent surface (RIS)-aided MISO downlink multiuser wireless network with simultaneous wireless information, and power transfer (SWIPT) is addressed. A practical algorithm is developed through an interplay of alternating optimization, sequential optimization, and pricing-based methods. Chapter 5 proposes an optimization algorithm that has a rapid convergence rate in a few iterations for maximizing the sum rate in IOS-aided MIMO broadcast channels, which can be exploited to serve the cell-edge user and enhance network coverage. This work's distinguishable feature lies in considering that the reflection and transmission coefficients of an IOS are tightly coupled. Finally, Chapter 6 summarizes the main findings of the thesis and discusses possible future directions that are worth investigating to unlock the full potential of RIS and bring it into practice
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Giorgini, Giacomo. "Channel estimation schemes in the presence of reconfigurable intelligent surfaces." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/22878/.
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Il progetto di tesi svolto riguarda lo studio di alcuni schemi di stima del canale di propagazione in presenza di superfici intelligenti riconfigurabili (comunemente chiamate RIS).
Nel Capitolo 1 viene mostrato il vantaggio di adottare una RIS, mentre nel Capitolo 2 quest'ultima viene analizzata più nel dettaglio, introducendo anche il problema di stima del canale in scenari simili.
Nel Capitolo 3 viene presentato lo stato dell'arte relativo ai principali approcci di stima del canale studiati in letteratura e viene analizzato nel dettaglio uno dei principali approcci ottimi validi nel caso di sistemi singola antenna, in cui la comunicazione viene assistita da una singola RIS, ed un secondo approccio valido nel caso di sistemi multi-antenna.
Essendo il numero elevato di toni pilota necessari per la stima del CSI negli algoritmi presenti in letteratura il principale problema da affrontare, nel Capitolo 4 viene proposto un nuovo algoritmo, valido nel caso SISO, in grado di superare questo grosso limite. In particolare, viene analizzato il profilo di fase del canale sia in condizioni di campo lontano che campo vicino, e viene poi illustrato nel dettaglio come tali informazioni possono essere sfruttare per stimare il canale tramite un approccio ML. Le simulazioni che seguono, fanno vedere come un simile approccio sia in grado di ottenere delle valide stime delle informazioni di canale sfruttando solamente il 10/15$\%$ dei toni pilota necessari nell'approccio ottimo descritto nel Capitolo 3. Viene poi evidenziato come il problema di stima del canale sia equivalente al problema di stima della posizione del ricevitore. In particolare, note le posizioni del trasmettitore e della RIS adottata, viene illustrato un metodo (strettamente collegato all'approccio di stima del canale) di stima della posizione del ricevitore.
Infine, nel Capitolo 5, vengono presentate le conclusioni e possibili sviluppi futuri correlati all'algoritmo proposto nel capitolo precedente.
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Liu, Jiang. "Wireless Communications Assisted by Reconfigurable Intelligent Surfaces." Electronic Thesis or Diss., université Paris-Saclay, 2021. http://www.theses.fr/2021UPASG111.
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Récemment, l'émergence de la surface intelligente reconfigurable (RIS) a attiré l'attention de l'industrie et du monde universitaire. Un RIS est une surface plane qui se compose d'un grand nombre d'éléments réfléchissants passifs à faible coût. En ajustant soigneusement les déphasages des éléments réfléchissants, un RIS peut remodeler l'environnement sans fil pour une meilleure communication. Dans cette thèse, nous nous concentrons sur deux sujets : (i) Étudier la modélisation et l'optimisation des systèmes de communication assistés par RIS. (ii) Étudier la modulation spatiale assistée par RIS, en particulier la détection à l'aide de techniques d'apprentissage en profondeur. Le chapitre 1 présente le concept d'environnements radio intelligents et de SIF. Dans la 5G et les communications futures, le RIS est une technique clé pour obtenir une connectivité transparente et une consommation d'énergie moindre en même temps. Le chapitre 2 présente les systèmes de communication assistés par RIS. Le principe de réflexion, le problème d'estimation de canal et le problème de conception du système sont présentés en détail. Les recherches de pointe sur les problèmes d'estimation de canal et de conception de système sont passées en revue. Le chapitre 3 étudie la distribution du rapport signal sur bruit (SNR) en tant que variable aléatoire dans un système MIMO (entrées multiples et sorties multiples) assisté par RIS. L'évanouissement de Rayleigh et la propagation en visibilité directe sont considérés séparément. La dérivation théorique et la simulation numérique prouvent que le SNR est équivalent en distribution au produit de trois (évanouissement de Rayleigh) ou de deux (propagation en ligne de visée) variables aléatoires indépendantes. Le chapitre 4 étudie le comportement des interférences dans un système MIMO assisté par RIS, où chaque station de base dessert un équipement utilisateur (UE) via un RIS. L'interférence au niveau d'un UE est causée par son RIS non desservant. Il est prouvé que le rapport interférence/bruit est équivalent en distribution au produit d'une variable aléatoire Chi-carré et d'une variable aléatoire qui peut être approchée avec une distribution Gamma. Le chapitre 5 se concentre sur la modulation spatiale assistée par RIS. Tout d'abord, nous introduisons la détection assistée par apprentissage en profondeur pour les systèmes MIMO. Ensuite, en généralisant les systèmes de modulation spatiale assistés par RIS en tant que cas particulier des systèmes de modulation spatiale traditionnels, nous étudions la détection basée sur l'apprentissage en profondeur pour les systèmes de modulation spatiale assistés par RIS. Les résultats numériques valident les schémas de détection d'apprentissage en profondeur basés sur des données et sur des modèles pour les systèmes de modulation spatiale assistés par RIS. Enfin, le chapitre 6 conclut la thèse et discute des pistes de recherche futures possibles<br>Recently, the emergence of reconfigurable intelligent surface (RIS) has attracted heated attention from both industry and academia. A RIS is a planar surface that consists of a large number of low-cost passive reflecting elements. By carefully adjusting the phase shifts of the reflecting elements, an RIS can reshape the wireless environment for better communication. In this thesis, we focus on two subjects: (i) To study the modeling and optimization of RIS-aided communication systems. (ii) To study RIS-aided spatial modulation, especially the detection using deep learning techniques. Chapter 1 introduces the concept of smart radio environments and RIS. In 5G and future communications, RIS is a key technique to achieve seamless connectivity and less energy consumption at the same time. Chapter 2 introduces RIS-aided communication systems. The reflection principle, channel estimation problem and system design problem are introduced in detail. State-of-the-art research on the problems of channel estimation and system design are overviewed. Chapter 3 investigates the distribution of the signal-to-noise ratio (SNR) as a random variable in an RIS-aided multiple-input multiple-output (MIMO) system. Rayleigh fading and line-of-sight propagation are considered separately. The theoretical derivation and numerical simulation prove that the SNR is equivalent in distribution to the product of three (Rayleigh fading) or two (line-of-sight propagation) independent random variables. Chapter 4 studies the behavior of interference in an RIS-aided MIMO system, where each base station serves a user equipment (UE) through an RIS. The interference at a UE is caused by its non-serving RIS. It is proven that the interference-to-noise ratio is equivalent in distribution to the product of a Chi-squared random variable and a random variable which can be approximated with a Gamma distribution. Chapter 5 focuses on RIS-aided spatial modulation. First, we introduce deep learning aided detection for MIMO systems. Then, by generalizing RIS-aided spatial modulation systems as a special case of traditional spatial modulation systems, we investigate deep learning based detection for RIS-aided spatial modulation systems. Numerical results validate the proposed data-based and model-based deep learning detection schemes for RIS-aided spatial modulation systems. Finally, Chapter 6 concludes the thesis and discusses possible future research directions
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Danufane, Fadil. "Wireless communications assisted by reconfigurable intelligent surfaces : an electromagnetic model." Electronic Thesis or Diss., université Paris-Saclay, 2021. http://www.theses.fr/2021UPASG038.
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L'émergence de l'environnement radio intelligent (SRE) en tant que nouveau paradigme qui remet en question le status quo dans la communication sans fil a motivé l'utilisation des surface intelligentes reconfigurables (RIS) basées sur des métasurfaces pour améliorer la limite de performance des systèmes de communication sans fil. L'objectif principal de cette thèse est la modélisation d'un système de communication assisté par un RIS à l'aide d'approches basées sur l'électromagnétisme.Le Chapitre 1 présente le concept d'environnement radio intelligent. Nous donnons également la définition du RIS et comment le RIS peut être utilisé dans le contexte du SRE. Nous donnons aussi quelques perspectives historiques et discutons le développement des activités de recherche dans ce contexte.Le Chapitre 2 présente les concepts théoriques nécessaires pour comprendre les résultats des chapitres suivants. Ce chapitre est divisé en deux parties. La première partie traite de la modélisation des métasurfaces où nous passons d'une description microscopique basée sur la physique d'une métasurface et introduisons une représentation macroscopique de celle-ci, qui s'avère appropriée pour une application aux communications sans fil. La deuxième partie présente plusieurs approches analytiques qui nous permettent de calculer le champ électromagnétique dans un certain volume..Le Chapitre 3 fournit une comparaison des performances entre les RISs fonctionnant comme des réflecteurs anormaux et un schéma de relais basé sur le décodage et la transmission. La comparaison est qualitative et couvre une multitude de métriques. En outre, une comparaison quantitative en termes de débits de données réalisables est également présentée. En particulier, les résultats numériques montrent que des RISs suffisamment grands peuvent être plus performants que les systèmes assistés par relais en termes de débit de données, tout en réduisant la complexité.Le Chapitre 4 propose une caractérisation analytique du champ électromagnétique en présence d'un RIS qui est modélisé comme une métasurface homogénéisée et qui fonctionne soit en réflexion ou transmission. Des expressions de forme fermée sont également obtenues dans deux régimes asymptotiques qui sont représentatifs de deux déploiements en champ lointain et en champ proche. Sur la base de l'approche proposée, l'impact de plusieurs paramètres est étudié.Enfin, le Chapitre 5 résume la thèse et discute des perspectives futures qui méritent d'être étudiées pour mieux comprendre les avantages et les inconvénients des RISs pour application aux communications sans fil<br>The emergence of smart radio environment (SRE) as a new paradigm that challenges the status quo in wireless communication has motivated the use of metasurface-based reconfigurable intelligent surface (RIS) to improve the performance limits in wireless communication systems. The main focus of this thesis is the modeling of reconfigurable intelligent surfaces (RIS)-aided communication systems using electromagnetic based methods.Chapter 1 introduces the concept of smart radio environment. We also give the definition of RIS and how RIS can be used in context of SRE. To give some historical perspectives, we also discuss several important milestone papers throughout the development of research activities that lead to the current state of the art.Chapter 2 introduces theoretical concepts that are necessary to understand the results in the subsequent chapters. This chapter is divided into two parts. The first part discusses the metasurfaces modeling where we move from a physics-based microscopic description of a metasurface and introduces a macroscopic representation for it, which is shown to be suitable for application in wireless communications. The second part introduces several analytical approaches that allow us to compute the EM field at any point of a given volume that contains the metasurface.Chapter 3 provides a performance comparison between RISs operating as anomalous reflectors and a decode-and-forward relaying scheme that is representative of competing candidate technologies to realize SREs. The comparison is qualitative and covers multitude metrics. Furthermore, a quantitative comparison in terms of achievable data rates is presented. In particular, the numerical results show that sufficiently large RISs can outperform relay-aided systems in terms of data rate, while reducing the implementation complexity.Chapter 4 proposes an electromagnetic-based analytical characterization of the free-space path-loss of a wireless link in the presence of a RIS that is modeled as a two-dimensional homogenized metasurface made of sub-wavelength scattering elements and that operate either in reflection or transmission mode. The analytical method of physical optics is employed. Closed-form expressions are also obtained in two asymptotic regimes that are representative of far-field and near-field deployments. Based on the proposed approach, the impact of several design parameters and operating regimes is unveiled.Finally, Chapter 5 summarizes the main findings of the thesis and discusses possible future directions that are worth investigating to unlock the full potential of RIS and bring it into practice
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Song, Jian. "A Stochastic Geometry Approach to the Analysis and Optimization of Cellular Networks." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS545.
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Cette thèse porte principalement sur la modélisation, l'évaluation des performances et l'optimisation au niveau système des réseaux cellulaires de nouvelle génération à l'aide de la géométrie stochastique. En plus, la technologie émergente des surfaces intelligentes reconfigurables (RISs) est étudiée pour l'application aux futurs réseaux sans fil. En particulier, reposant sur un modèle d’abstraction basé sur la loi de Poisson pour la distribution spatiale des nœuds et des points d’accès, cette thèse développe un ensemble de nouveaux cadres analytiques pour le calcul d’importantes métriques de performance, telles que la probabilité de couverture et l'efficacité spectrale potentielle, qui peuvent être utilisés pour l'analyse et l'optimisation au niveau système. Plus spécifiquement, une nouvelle méthodologie d'analyse pour l'analyse de réseaux cellulaires tridimensionnels est introduite et utilisée pour l'optimisation du système. Un nouveau problème d’allocation de ressources est formulé et résolu en combinant pour la première fois géométrie stochastique et programmation non linéaire mixte en nombres entiers. L'impact du déploiement de surfaces réfléchissantes intelligentes sur un réseau sans fil est quantifié à l'aide de processus ponctuels, et les avantages potentiels des RISs contre le relais sont étudiés à l'aide de simulations numériques<br>The main focus of this thesis is on modeling, performance evaluation and system-level optimization of next-generation cellular networks by using stochastic geometry. In addition, the emerging technology of Reconfigurable Intelligent Surfaces (RISs) is investigated for application to future wireless networks. In particular, relying on a Poisson-based abstraction model for the spatial distribution of nodes and access points, this thesis develops a set of new analytical frameworks for the computation of important performance metrics, such as the coverage probability and potential spectral efficiency, which can be used for system-level analysis and optimization. More specifically, a new analytical methodology for the analysis of three-dimensional cellular networks is introduced and employed for system optimization. A novel resource allocation problem is formulated and solved by jointly combining for the first time stochastic geometry and mixed-integer non-linear programming. The impact of deploying intelligent reflecting surfaces throughout a wireless network is quantified with the aid of line point processes, and the potential benefits of RISs against relaying are investigated with the aid of numerical simulations
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Mursia, Placido. "Multi-antenna methods for scalable beyond-5G access networks." Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS532.
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L’augmentation exponentielle des équipements d’utilisateurs sans fil (UEs) et des services des réseaux associés aux déploiements actuels de cinquième génération (5G) pose plusieurs défis de conception sans précédent qui doivent être résolus avec l’avènement des futurs réseaux au-delà de la 5G. Plus précisément, la demande croissante de débits de données élevés ainsi que la nécessité de desservir un grand nombre d’appareils hétérogènes, allant des téléphones mobiles classiques aux objets connectés formant l’internet des objets (IoT), motivent l’étude de nouveaux schémas de traitement et de transmission du signal. À cet égard, les sorties multiples massives à entrées multiples (massive MIMO) sont une technologie d’accès bien établie, qui permet de desservir plusieurs dizaines d’UEs en utilisant lesmêmes ressources temps-fréquence au moyen de techniques de formation de faisceau hautement directionnelles. Cependant, le massive MIMO présente des problèmes d’évolutivité dans les scénarios accès massif où la population UE est composée d’un grand nombre de périphériques hétérogènes. En effet, si la disponibilité d’un grand nombre d’antennes dans les émetteurs-récepteurs massive MIMO apporte des gains de performances substantiels, elle augmente également considérablement la surcharge et la complexité du système. Plus précisément, la dimensionnalité élevée des canaux nécessite l’allocation de ressources temps-fréquence considérables pour acquérir les informations d’état de canal (CSI) et se traduit par de grandes opérations matricielles pour construire des précodeurs/décodeurs. De plus, dans le contexte de communications de multidiffusion comme, par exemple, la mise en cache périphérique sans fil ou la diffusion de messages critiques pour la mission, les techniques d’antennes multiples conventionnelles présentent des taux de disparition lorsque le nombre d’UEs augmente même dans le régime d’antenne massif. Enfin, le grand nombre de chaînes de radiofréquences (RF) associées aux émetteurs-récepteurs massive MIMO, qui sont utilisés pour contrer les pertes de propagation dans des environnements difficiles tels que, par exemple, à des fréquences d’ondes millimétriques (mmWave), se heurte au budget de puissance limité des appareils IoT. Dans cette thèse, nous proposons de nouvelles méthodes à antennes multiples évolutives pour l’amélioration des performances dans les scénarios d’intérêt susmentionnés. Plus précisément, nous décrivons le rôle fondamental joué par le CSI statistique qui peut être mis à profit pour réduire à la fois la complexité et la surcharge pour l’acquisition de CSI et pour la suppression des interférences multi-utilisateurs. En effet, lorsque les UEs sont équipés au moins de duex antennes, leurs propriétés de sélectivité spatiale peuvent être exploitées pour imposer une orthogonalité statistique parmi les transmissions interférentes. De plus, nous exploitons les communications de périphérique à périphérique (D2D) pour surmonter le goulot d’étranglement fondamental de la multidiffusion conventionnelle. En particulier, nous exploitons les capacités de précodage d’un émetteur multi-antennes pour sélectionner soigneusement les UEs dans des conditions de canal favorables, qui à leur tour agissent comme des relais opportunistes et retransmettent le message via les liaisons D2D. Enfin, dans le cadre des communications mmWave, nous explorons les avantages des surfaces intelligentes reconfigurables (RISs) récemment proposées, qui sont un catalyseur clé de l’innovation grâce à leur structure intrinsèquement passive qui permet de contrôler l’environnement de propagation et de contrer efficacement les pertes de propagation. En particulier, nous utilisons la formation de faisceaux passive au niveau du RIS, c’est-à-dire sans aucune dépense d’énergie significative, ainsi que la formation de faisceaux active conventionnelle au niveau de l’émetteur pour augmenter considérablement les performances du réseau<br>The exponential increase of wireless user equipments (UEs) and network services associated with current 5G deployments poses several unprecedented design challenges that need to be addressed with the advent of future beyond-5G networks and novel signal processing and transmission schemes. In this regard, massive MIMO is a well-established access technology, which allows to serve many tens of UEs using the same time-frequency resources. However, massive MIMO exhibits scalability issues in massive access scenarios where the UE population is composed of a large number of heterogeneous devices. In this thesis, we propose novel scalable multiple antenna methods for performance enhancement in several scenarios of interest. Specifically, we describe the fundamental role played by statistical channel state information (CSI) that can be leveraged for reduction of both complexity and overhead for CSI acquisition, and for multiuser interference suppression. Moreover, we exploit device-to-device communications to overcome the fundamental bottleneck of conventional multicasting. Lastly, in the context of millimiter wave communications, we explore the benefits of the recently proposed reconfigurable intelligent surfaces (RISs). Thanks to their inherently passive structure, RISs allow to control the propagation environment and effectively counteract propagation losses and substantially increase the network performance
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Praia, João Miguel Rocha. "Um projeto de sistema de comunicações com reconhecimento de contexto para a banda THz." Master's thesis, 2021. http://hdl.handle.net/10071/24172.
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As comunicações na banda Terahertz (THz) são consideradas uma tecnologia crucial para a
transmissão de dados a velocidades ultra-elevadas em sistemas de comunicação sem fios da
futura geração. As extensas larguras de banda disponíveis nas frequências de THz têm o custo
de graves perdas de propagação e limitações de potência, o que resulta em distâncias de
comunicação muito curtas. Superfícies inteligentes reconfiguráveis (RIS) são uma tecnologia
promissora para ultrapassar esta limitação uma vez que têm capacidade para moldar as ondas
THz, ajustando adequadamente as mudanças de fase. Esta dissertação foca-se no estudo de um
sistema eficaz em contexto de ambiente para as comunicações sem fio THz.
Na presente dissertação concebemos um sistema de comunicação sem fios ultra-massivo
de múltiplas entradas e saídas (UM-MIMO) assistido por RIS. Para maximizar a taxa alcançável
do sistema, e ao mesmo tempo que se lida com a grande configuração de problemas que é típica
dos sistemas UM-MIMO assistidos por RIS, é desenvolvido um algoritmo de gradiente
proximal acelerado (APG) de baixa complexidade para o cálculo das mudanças de fase dos
elementos do RIS. Também se considera a pré-codificação híbrida, a qual é necessária para
tornar viável a implementação de comunicações UM-MIMO nos THz, e avalia-se a incidência
de não-idealidades que são típicas na implementação prática do sistema.
Os resultados numéricos demonstram que quanto maior o RIS maior taxa de dados o
sistema alcança, e que o mesmo deve ficar situado na vizinhança do recetor ou do transmissor.
A eficácia do algoritmo proposto também é comprovada, mesmo quando se considera a
quantização realista das mudanças de fase discretas e o conhecimento imperfeito do canal.<br>Terahertz (THz)-band communications are considered a crucial technology for ultrahigh data
rate transmission in future-generation wireless communication systems. The extensive
available bandwidths at THz frequencies come at the cost of severe propagation losses and
power limitations, which results in very short communication distances. Reconfigurable
intelligent surfaces are a promising technology to overcome this limitation as they can be used
to shape THz waves by adequately adjusting the phase shifts. This dissertation focuses on the
study of an effective system for THz wireless communications environment.
In this dissertation, we design a RIS-assisted ultra-massive multiple-input multiple-output
(UM-MIMO) wireless communication system. To maximize the achievable rate of the system,
while coping with the large problem setting that is typical in RIS-aided UM-MIMO systems, a
low complexity accelerated proximal gradient (APG) algorithm is developed for computing the
phase-shifts of the RIS elements. We also consider the adoption of hybrid precoding which is
necessary for viable UM-MIMO THz implementations and evaluate the impact of non-idealities
that are typical in practical implementations of the system.
Numerical results demonstrate that the larger the RIS is, the higher data rate the system
achieves, and that it should be located in the vicinity of the receiver or transmitter. The
effectiveness of the proposed algorithm is also proven, even when considering realistic
quantization of discrete phase shifts and imperfect channel knowledge.
Libros sobre el tema "Reconfigurable Intelligent Surfaces (RIS)"
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Faisal, Alice, Ibrahim Al-Nahhal, Octavia A. Dobre, and Telex M. N. Ngatched. Reinforcement Learning for Reconfigurable Intelligent Surfaces. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-52554-4.
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Imran, Muhammad Ali, Lina Mohjazi, Lina Bariah, Sami Muhaidat, and Tei Jun Cui. Intelligent Reconfigurable Surfaces (IRS) for Prospective 6G Wireless Networks. Wiley & Sons, Incorporated, John, 2022.
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Imran, Muhammad Ali, Lina Mohjazi, Lina Bariah, Sami Muhaidat, and Tei Jun Cui. Intelligent Reconfigurable Surfaces (IRS) for Prospective 6G Wireless Networks. Wiley & Sons, Incorporated, John, 2022.
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Intelligent Reconfigurable Surfaces (IRS) for Prospective 6G Wireless Networks. Wiley & Sons, Limited, John, 2023.
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Imran, Muhammad Ali, Lina Mohjazi, Lina Bariah, Sami Muhaidat, and Tei Jun Cui. Intelligent Reconfigurable Surfaces (IRS) for Prospective 6G Wireless Networks. Wiley & Sons, Incorporated, John, 2022.
Buscar texto completoCapítulos de libros sobre el tema "Reconfigurable Intelligent Surfaces (RIS)"
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Zhang, Hongliang, Boya Di, Lingyang Song, and Zhu Han. "RIS Aided MIMO Communications." In Reconfigurable Intelligent Surface-Empowered 6G. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-73499-2_2.
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Zhang, Hongliang, Boya Di, Lingyang Song, and Zhu Han. "RIS Aided RF Sensing and Localization." In Reconfigurable Intelligent Surface-Empowered 6G. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-73499-2_4.
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Ihsana Muhammed, P., Yasar Moidutty, N. M. Sreenarayanan, and V. M. Meera. "Reconfigurable Intelligent Surface (RIS)-Assisted UAV Cellular Communication." In Unmanned Aerial Vehicle Cellular Communications. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-08395-2_6.
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Hu, Xiaoling, Chenxi Liu, Mugen Peng, and Caijun Zhong. "Introduction of RIS-Enabled ISAC." In Reconfigurable Intelligent Surface-Enabled Integrated Sensing and Communication in 6G. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-8299-8_1.
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Hu, Xiaoling, Chenxi Liu, Mugen Peng, and Caijun Zhong. "Angle Information Acquisition in RIS-Enabled ISAC." In Reconfigurable Intelligent Surface-Enabled Integrated Sensing and Communication in 6G. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-8299-8_3.
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Hu, Xiaoling, Chenxi Liu, Mugen Peng, and Caijun Zhong. "Sensing-Assisted Beamforming in RIS-Enabled ISAC." In Reconfigurable Intelligent Surface-Enabled Integrated Sensing and Communication in 6G. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-8299-8_5.
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Hu, Xiaoling, Chenxi Liu, Mugen Peng, and Caijun Zhong. "Theoretical Performance Analysis of RIS-Enabled ISAC." In Reconfigurable Intelligent Surface-Enabled Integrated Sensing and Communication in 6G. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-8299-8_2.
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Hu, Xiaoling, Chenxi Liu, Mugen Peng, and Caijun Zhong. "Delay-Doppler Information Acquisition in RIS-Enabled ISAC." In Reconfigurable Intelligent Surface-Enabled Integrated Sensing and Communication in 6G. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-8299-8_4.
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Le, Chi-Bao, Dinh-Thuan Do, and Samarendra Nath Sur. "Reconfigurable Intelligent Surface (RIS)-Assisted Wireless Systems: Potentials for 6G and a Case Study." In Advances in Communication, Devices and Networking. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2911-2_39.
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Rinchi, Omar, Ahmed Elzanaty, and Ahmad Alsharoa. "Wireless Localization with Reconfigurable Intelligent Surfaces." In 6G Wireless. CRC Press, 2023. http://dx.doi.org/10.1201/9781003282211-5.
Texto completoActas de conferencias sobre el tema "Reconfigurable Intelligent Surfaces (RIS)"
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Amri, Muhammad Miftahul. "Recent Trends in the Reconfigurable Intelligent Surfaces (RIS): Active RIS to Brain-controlled RIS." In 2022 IEEE International Conference on Communication, Networks and Satellite (COMNETSAT). IEEE, 2022. http://dx.doi.org/10.1109/comnetsat56033.2022.9994338.
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Yazdani, Reza, Manish Kizhakkeveettil Mathew, Zhekun Peng, and DongHyun Kim. "Reconfigurable Intelligent Surface (RIS) Design for 5G n260 Frequency Band." In 2023 IEEE Symposium on Electromagnetic Compatibility & Signal/Power Integrity (EMC+SIPI). IEEE, 2023. http://dx.doi.org/10.1109/emcsipi50001.2023.10241407.
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Eddine Zegrar, Salah, Liza Afeef, and Huseyin Arslan. "Reconfigurable intelligent surface (RIS): Eigenvalue Decomposition-Based Separate Channel Estimation." In 2021 IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC). IEEE, 2021. http://dx.doi.org/10.1109/pimrc50174.2021.9569501.
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Sadia, Haleema, Ziaul Haq Abbas, Ahmad Kamal Hassan, and Ghulam Abbas. "Outage Probability Analysis of Reconfigurable Intelligent Surface (RIS)-Enabled NOMA Network." In 2023 10th International Conference on Wireless Networks and Mobile Communications (WINCOM). IEEE, 2023. http://dx.doi.org/10.1109/wincom59760.2023.10322994.
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Youn, Youngno, Donggeun An, Daehyeon Kim, Myeonggin Hwang, and Wonbin Hong. "Cognitive Reconfigurable Intelligent Surface (RIS) for mmWave Integrated Sensing and Communication." In 2023 IEEE International Symposium On Antennas And Propagation (ISAP). IEEE, 2023. http://dx.doi.org/10.1109/isap57493.2023.10389072.
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Huang, Yiqian, Saviour Zammit, Ping Yang, et al. "Over-the-RIS Modulation: A Reconfigurable Intelligent Surface Assisted Modulation Design." In 2023 8th International Conference on Communication, Image and Signal Processing (CCISP). IEEE, 2023. http://dx.doi.org/10.1109/ccisp59915.2023.10355851.
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Ouyang, Chongjun, Hao Xu, Xujie Zang, and Hongwen Yang. "On the Ergodic Capacity of Reconfigurable Intelligent Surface (RIS)-Aided MIMO Channels." In 2022 IEEE 96th Vehicular Technology Conference (VTC2022-Fall). IEEE, 2022. http://dx.doi.org/10.1109/vtc2022-fall57202.2022.10012964.
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Zhao, Qichao, Wenfei Gong, Tianwei Hou, Xin Sun, and Eliane Bodanese. "Global Navigation Satellite System (GNSS): A Reconfigurable Intelligent Surface (RIS)-aided Approach." In GLOBECOM 2022 - 2022 IEEE Global Communications Conference. IEEE, 2022. http://dx.doi.org/10.1109/globecom48099.2022.10001462.
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Zhao, Qichao, Wenfei Gong, Tianwei Hou, Xin Sun, Anna Li, and Eliane Bodanese. "Integrated-Navigation-and-Communication (INAC): A Reconfigurable Intelligent Surface (RIS)-aided Approach." In 2023 IEEE 97th Vehicular Technology Conference (VTC2023-Spring). IEEE, 2023. http://dx.doi.org/10.1109/vtc2023-spring57618.2023.10199514.
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Dong, Limeng, and Wanyu Yan. "Active Reconfigurable Intelligent Surface (RIS) Aided Secure Wireless Transmission Under a Shared Power Source Between Transmitter and RIS." In 2022 14th International Conference on Wireless Communications and Signal Processing (WCSP). IEEE, 2022. http://dx.doi.org/10.1109/wcsp55476.2022.10039260.
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