Article
Automation & Control Systems
Osamah S. Badarneh, Raed Mesleh, Yazid M. Khattabi
Summary: This paper investigates the performance analysis of using reconfigurable intelligent surfaces (RIS) in a Terahertz (THz) communication system. The study evaluates the system performance in terms of outage probability, ergodic capacity, and average bit error rate (ABER), and explores the impact of channel parameters, number of reflecting elements, and misalignment error (pointing error impairments) in RIS.
JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS
(2022)
Article
Computer Science, Information Systems
Chi-Bao Le, Dinh-Thuan Do, Xingwang Li, Yung-Fa Huang, Hsing-Chung Chen, Miroslav Voznak
Summary: This paper investigates the application of RIS-based NOMA scheme in emerging communication systems, designs two links to improve the performance of the far user, and characterizes system performance through closed-form expressions. Monte-Carlo simulations reveal that the probability of the two users experiencing system outage is determined by factors related to power allocation, power transmission at the base station, and the number of reflecting elements in the RISs.
Article
Engineering, Electrical & Electronic
Ibrahim Yildirim, Ali Uyrus, Ertugrul Basar
Summary: This paper investigates the potential benefits of using RIS in indoor/outdoor setups and various frequency bands, with a focus on the effect of reflecting elements on signal-to-noise ratio, error performance, path loss exponent, and transmission models with multiple RISs. Through extensive simulations, it is demonstrated that RIS-assisted systems provide promising solutions for indoor/outdoor scenarios at various operating frequencies, even in the presence of system imperfections.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Ertugrul Basar, Ibrahim Yildirim, Fatih Kilinc
Summary: This paper provides a physical, accurate, open-source, and widely applicable RIS channel model for mmWave frequencies, filling an important gap in the literature. Various deployment scenarios for RISs and insights for system designers are presented, revealing the impact of RIS use on communication system performance. The paper also introduces the open-source and comprehensive SimRIS Channel Simulator.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2021)
Article
Computer Science, Information Systems
Faisal Alanazi
Summary: This paper suggests using reconfigurable intelligent surfaces (RIS) to enhance the physical layer security of wireless systems, showing that the use of RIS can improve security by 10-40 dB compared to conventional systems. The system model includes a source, destination, RIS, and eavesdropper, with RIS deployed as a reflector or transmitter.
INTERNATIONAL JOURNAL OF SENSOR NETWORKS
(2021)
Article
Engineering, Electrical & Electronic
Qingchao Li, Mohammed El-Hajjar, Ibrahim Hemadeh, Arman Shojaeifard, Alain A. M. Mourad, Bruno Clerckx, Lajos Hanzo
Summary: This article proposes a novel RIS architecture that improves signal propagation environment and enhances system performance through phase adjustment. It has lower complexity and higher channel gain compared to existing RIS structures.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Karl-Ludwig Besser, Eduard A. Jorswieck
Summary: This article introduces a phase hopping scheme for reconfigurable intelligent surfaces (RISs) which randomly varies the phase of each transmitted symbol, effectively converting slow fading into fast fading. It shows how this scheme can significantly improve outage performance without requiring channel state information (CSI) at the transmitter and RIS, enabling robust and ultra-reliable communications.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2022)
Article
Computer Science, Information Systems
Yiming Huo, Xiaodai Dong, Nuwan Ferdinand
Summary: With the commercialization and rapid deployment of 5G networks, the development of 6G wireless communication is focusing on providing competitive Quality of Service (QoS) to global users. This research emphasizes the modeling and characterization of wireless propagation in the terahertz (THz) domain and addresses the energy efficiency of future networks. By utilizing reconfigurable intelligent surface (RIS)-assisted wireless communications and a distributed RISs framework (DRF), the study demonstrates the efficacy of overcoming human blockage, improving THz signal coverage, and increasing signal-to-noise ratios (SNRs) and QoS. Moreover, the research explores the practical implementation of such a system with integrated sensing and communication techniques for efficient THz communications in IoT networks.
IEEE INTERNET OF THINGS JOURNAL
(2023)
Article
Telecommunications
Majid H. Khoshafa, Telex M. N. Ngatched, Mohamed H. Ahmed, Alain R. Ndjiongue
Summary: The use of active elements in RIS significantly reduces the size of the structure to achieve desired performance levels. A practical design for active RIS is proposed to overcome the double-fading problem in wireless communications systems.
IEEE COMMUNICATIONS LETTERS
(2021)
Article
Computer Science, Information Systems
David Demmer, Francesco Foglia Manzillo, Samara Gharbieh, Maciej Smierzchalski, Raffaele D'Errico, Jean-Baptiste Dore, Antonio Clemente
Summary: In this work, hybrid precoding techniques for multi-user T-RIS systems are studied. A multi-beam T-RIS propagation model with strong phase quantization constraints and limited beam codebooks is proposed and validated by characterizing a Ka-band T-RIS. The quad-beam T-RIS structure is optimized using two metrics and the system performance is evaluated in a multi-user scenario. The results show that considering analog precoding is sufficient to optimize the T-RIS, but a fully hybrid precoding scheme is required to deal with inter-user interference. A codebook-aware optimization is proposed to improve the aperture efficiency of the T-RIS system.
Article
Telecommunications
Athanasios P. Chrysologou, Alexandros-Apostolos A. Boulogeorgos, Nestor D. Chatzidiamantis
Summary: This letter investigates the performance of HRIS-assisted THz-NOMA wireless systems and proposes a system setup considering the unique features of HRIS, NOMA and THz transmission. Analytical closed-form expressions for UE's OPs under imperfect SIC are derived, and asymptotic expressions and diversity orders are evaluated for high signal-to-noise ratio. Numerical results confirm the validity of the analysis, show the superiority of NOMA approach over orthogonal multiple access-based approaches, and reveal the detrimental impact of misalignment on HRIS-assisted THz-NOMA systems' performance.
IEEE COMMUNICATIONS LETTERS
(2023)
Article
Computer Science, Information Systems
Jose David Vega Sanchez, Luis Urquiza-Aguiar, Martha Cecilia Paredes Paredes, F. Javier Lopez-Martinez
Summary: The study proposes a general approach to model RIS end-to-end equivalent channel using unsupervised learning algorithm, proving its superiority in accurately approximating the channel and incorporating crucial aspects of channel modeling.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2021)
Article
Computer Science, Information Systems
Kainan Li, Siyuan Zhou, Guoping Tan
Summary: This article examines the communication transmission performance of an RIS-assisted V2V communication network. By selecting the signal transmission mode and using stochastic geometry theory, the communication distance distribution and aggregate interference distribution of direct mode and RIS-assisted mode are calculated. The overall outage probability is evaluated for V2V communication in the direct mode. Numerical results show improved performance in RIS-assisted V2V networks with an optimized phase shift scheme. Monte Carlo simulation validates the analytical findings.
Article
Engineering, Electrical & Electronic
Aymen Khaleel, Ertugrul Basar
Summary: This paper proposes a low-cost and phase shift-free passive beamforming (PB) scheme for reconfigurable intelligent surface (RIS) that achieves the same signal-to-noise ratio scaling law as the classical phase shift-based PB scheme. The proposed scheme optimizes the on/off states of the RIS elements while fixing their phase shifts, resulting in less sensitivity to spatial correlation and phase errors. The performance of the proposed scheme is characterized through mathematical analysis and computer simulations, showing clear superiority over the classical scheme under different performance metrics.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2022)
Article
Chemistry, Analytical
Francesco Chiti, Ashley Degl'Innocenti, Laura Pierucci
Summary: This paper proposes the integration of a multi-RISs system within a Software Defined Networking (SDN) architecture to provide a specific control layer for secure data flows forwarding. The optimization problem is properly characterized, and different heuristics are proposed to evaluate the more suitable multi-beam routing strategy. Numerical results are provided to show the improvement of secrecy rate and the security performance in a pedestrian scenario.
Article
Engineering, Electrical & Electronic
Mohammad Alibakhshikenari, Bal S. Virdee, Sonia Aissa, Chan H. See, Ayman A. Althuwayb, Raed A. Abd-Alhameed, Isabelle Huynen, Francisco Falcone, Ernesto Limiti
Summary: A set of singular integral formulations are derived in this letter to calculate the surface impedance matrix on the antenna array elements, enabling electrodynamic analysis of antenna arrays designed using metamaterial-inspired structures. The proposed model offers significantly lower computational cost compared to conventional EM solvers and shows excellent agreement with full-wave EM software, validating its accuracy for single-layer structures.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Gervais N. Kamga, Sonia Aissa, Tau R. Rasethuntsa, Mohamed-Slim Alouini
Summary: This paper investigates the performance of dual-hop amplify-and-forward mixed RF/FSO transmissions with partial relay selection based on outdated CSI estimates. Novel closed-form expressions for key performance metrics are derived, showing that in the low SNR regime, the use of more relays in PRS systems may be prohibitive.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2021)
Article
Telecommunications
Insha Amin, Deepak Mishra, Ravikant Saini, Sonia Aissa
Summary: This letter considers a trusted decode-and-forward relay-assisted two-user non-orthogonal multiple access (NOMA) communication system, and solves the problem of secure rate maximization for the near user. The problem is optimally solved using KKT conditions, while satisfying the quality of service (QoS) requirements of the far user.
IEEE COMMUNICATIONS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Ali Bayat, Sonia Aissa
Summary: In this paper, a deep learning based resource allocation framework is designed for simultaneous information and power transfer. An optimal mechanism is developed to maximize revenue using Myerson's lemma and virtual welfare maximization. To overcome the complexity, a deep neural network (DNN) is proposed. Additionally, a heuristic iterative solution is introduced.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2022)
Article
Telecommunications
Soumya P. Dash, Sandeep Joshi, Sonia Aissa
Summary: This research investigates the operation of point-to-point communication assisted with reconfigurable intelligent surfaces, specifically focusing on Rician fading and the correlation between multi-hop channels. The study evaluates system performance in terms of reliability and capacity, considering binary phase-shift keying signaling and optimal maximum-likelihood detection. Results reveal the impact of channel correlation on error rate and provide practical guidelines for system deployments with high reliability.
IEEE COMMUNICATIONS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Rakhesh Singh Kshetrimayum, Mohit Mishra, Sonia Aissa, Shiban K. Koul, Mohammad S. Sharawi
Summary: This letter calculates the diversity order (DO) and diversity measure (DM) of multiple-input multiple-output (MIMO) antennas in various practical scenarios of single-user, multiuser, and massive MIMO wireless communications. These metrics are computed using the antenna correlation coefficient (ACC) matrix. The DO is obtained from the rank of the ACC matrix, while the DM is derived from the trace and Frobenius norm of the ACC matrix. Numerical results are presented, highlighting that the DM captures the impact of antenna correlation on diversity gain more effectively than the DO.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Anirban Bhowal, Sonia Aissa
Summary: In future wireless networks, device-to-device (D2D) communications play a critical role in supporting various applications. This paper proposes a framework for bidirectional D2D communications using reconfigurable intelligent surfaces (RIS) that manipulate radio waves. The framework leverages concepts of polarization and achieves high reliability, high spectral and energy efficiencies, even in the presence of hardware impairments and imperfect interference cancellation.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Zina Mohamed, Anirban Bhowal, Sonia Aissa
Summary: This paper investigates the power coverage probability in cooperative wireless powered communication networks. The probability density functions (PDF) of the distance between the access points and devices are derived based on Poisson-Delaunay triangulation theory. Closed-form expressions for wireless power coverage probability are obtained for different device locations using stochastic geometry theory. A new implementation for numerical calculation of a complex function is proposed. The impacts of network parameters on the proposed framework are analyzed, showing significant gains compared to non-cooperative schemes.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Zina Mohamed, Sonia Aissa
Summary: A novel framework for joint broadcast-unicast downlink transmissions using dual-polarized aerial reconfigurable intelligent surface (RIS) is proposed in this paper to maximize energy efficiency. The optimization problem is solved using a two-stage algorithm, where the first stage designs the passive beamforming matrix of the RIS and the second stage designs the active beamforming at the base station. Numerical results show that the proposed polarization-based communication system achieves higher energy efficiency gains compared to a layered division multiplexing system.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2023)
Article
Computer Science, Hardware & Architecture
Konstantinos Oikonomou, George Koufoudakis, Sonia Aissa, Ioannis Stavrakakis
Summary: This paper proposes a probabilistic flooding information dissemination policy and investigates the relationship between global coverage and node eigenvector centrality in this policy. The analysis shows that under certain conditions, the policy can achieve global coverage, and the coverage and receiving probability are proportional to the node eigenvector centrality.
IEEE-ACM TRANSACTIONS ON NETWORKING
(2023)
Article
Computer Science, Information Systems
Anirban Bhowal, Sonia Aissa
Summary: By making the propagation environment programmable, reconfigurable intelligent surfaces (RIS) are essential for meeting the quality-of-service requirements of device-to-device (D2D) communications. However, a single RIS may not establish a line-of-sight path in environments with scattering or distant devices, hindering communications in applications that require transferring different data sets to multiple destinations. This letter proposes a dual-polarized cooperative RIS-assisted MIMO D2D communication scheme, selecting beam routing path via multiple RISs based on the maximum received signal-to-noise ratio and path constraints. The scheme outperforms other RIS-based schemes in terms of system performance.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Bhaskara Narottama, Zina Mohamed, Sonia Aissa
Summary: This paper provides a comprehensive coverage of quantum machine learning (QML) methodologies in the context of wireless communications, exploring fundamental principles of quantum computing, various QML techniques, and their potential applications in optimizing wireless systems. It also examines the integration of quantum-based learning models into existing machine learning methodologies and highlights studies that utilize QML-based optimization methods.
IEEE OPEN JOURNAL OF THE COMMUNICATIONS SOCIETY
(2023)
Article
Engineering, Electrical & Electronic
Milad Abolpour, Sonia Aissa, Leila Musavian, Anirban Bhowal
Summary: In this paper, the performance of rate splitting is thoroughly investigated for simultaneous service to a near user and far user, focusing on outage and secrecy outage. Different decoding strategies are proposed and evaluated, and closed-form expressions for outage probability and tight approximations for secrecy outage probability are obtained. The results indicate that for better outage probability, each user should decode the private stream with lower target data rate after decoding the common stream, without considering secrecy. To improve secrecy outage probability, the near user should decode the far user's private stream after decoding the common stream, and the far user should first retrieve the private stream with lower target data rate.
IEEE OPEN JOURNAL OF THE COMMUNICATIONS SOCIETY
(2022)
Article
Telecommunications
Ali Bayat, Sonia Aissa
Summary: This study compares two wireless power transfer (WPT) scheduling schemes, TS and SM, in terms of fairness among energy receivers (ERs) while considering the nonlinearity of harvesting circuits. A theoretical analysis is performed to determine the optimal scheduling policies and solve the max-min fairness optimization problems in both homogeneous and heterogeneous network scenarios, with the conclusion that TS outperforms SM due to considering the non-linearity of harvesting devices.
IEEE TRANSACTIONS ON GREEN COMMUNICATIONS AND NETWORKING
(2022)
