Article
Engineering, Electrical & Electronic
Zhuangzhuang Cui, Ke Guan, Jiayi Zhang, Zhangdui Zhong
Summary: The reconfigurable intelligent surface (RIS) technique is attracting attention due to its cost-effectiveness, easy deployment, and high controllability, with a focus on improving signal transmission quality by analyzing the signal-to-noise ratio (SNR) coverage probability. This study considers practical issues and utilizes path loss and Rayleigh fading models to derive both exact and approximate expressions for SNR coverage probability, taking into account factors like RIS element number and size, channel fading coefficients, and incident angles. The comprehensive evaluation reveals the impacts of essential factors on SNR coverage probability, providing valuable insights for evaluating and implementing RIS in practice.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2021)
Article
Computer Science, Information Systems
Sultangali Arzykulov, Galymzhan Nauryzbayev, Abdulkadir Celik, Ahmed M. Eltawil
Summary: Reconfigurable intelligent surfaces (RISs) are a revolutionary technique in wireless networks. This article analyzes the performance of an RIS-aided multihop FD relaying system and proposes a solution to improve system performance by combining active FD relaying with passive RIS platforms.
IEEE SYSTEMS JOURNAL
(2022)
Article
Computer Science, Information Systems
Anas M. Salhab, Liang Yang
Summary: This study proposes and evaluates the performance of an RIS-equipped RF/FSO mixed relay network with opportunistic RF source scheduling, focusing on the system's performance and approximations at high SNR values. The research findings indicate that at high SNR values, system performance is dominated by the worst hop, and the impact of N on performance is more significant than that of K.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2021)
Article
Telecommunications
Yongwei Wang, Wensheng Zhang, Yunfei Chen, Cheng-Xiang Wang, Jian Sun
Summary: This paper proposes a novel multiple RIS-assisted single-input-single-output (SISO) wireless communication system. Numerical results indicate that the number of RISs, the number of RIS elements, and the communication environment can significantly affect the system's performance.
IEEE COMMUNICATIONS LETTERS
(2022)
Article
Computer Science, Information Systems
Mingxing Wang, Wei Duan, Guoan Zhang, Miaowen Wen, Jaeho Choi, Pin-Han Ho
Summary: In this letter, a novel reconfigurable intelligent surface (RIS)- and relay-assisted cooperative network with non-orthogonal multiple access (NOMA) is proposed, considering both line-of-sight (LoS) and non-line-of-sight (NLoS) scenarios for different user locations. The capacities of the RIS- and relay-assisted downlinks are analyzed, and the central limit theorem (CLT) and Jensen's inequality are used to derive a tight upper bound for the channel gain. The solutions in relay and RIS are further explored to provide more capacity advantages. Numerical and simulation results confirm the accuracy of the derived expressions and the superiority of the proposed model. It is also clarified that RIS- and relay-assisted cooperative networks have various advantages and limitations under different transmit scenarios.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Zheng Yang, Jamal Ahmed Hussein, Peng Xu, Gaojie Chen, Yi Wu, Zhiguo Ding
Summary: This paper considers cooperative non-orthogonal multiple access (NOMA) networks with one pair primary user and one pair cognitive user sharing the same spectrum resource via a common relay. A dynamic power transmission scheme is proposed for both uplink and downlink NOMA transmission in cognitive relay networks, preserving the quality of service for the primary user. Closed-form expressions for overall outage probability and average sum rate are derived, showing that the proposed dynamic power control scheme enhances performance gain for the networks compared to existing NOMA power allocation schemes.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2021)
Article
Computer Science, Hardware & Architecture
Phuong T. Tran, Ba Cao Nguyen, Tran Manh Hoang, Le The Dung, Nguyen Van Vinh
Summary: In this paper, a theoretical framework for analyzing the performance of a non-orthogonal multiple access (NOMA) system with multiple advanced reconfigurable intelligent surfaces (RISs) and a traditional relay is proposed. The analytical expressions of main performance metrics are derived and confirmed through Monte-Carlo simulations. The results show that the proposed RIS-R-NOMA system achieves significantly lower outage probability (OP) and higher achievable data rate (ADR) compared to traditional NOMA systems without RIS or relay. Furthermore, the effects of various parameters on the performance of the RIS-R-NOMA system are demonstrated.
Article
Engineering, Electrical & Electronic
Shizhao Yang, Jun Zhang, Wenchao Xia, Hui Gao, Hongbo Zhu
Summary: This paper investigates a simultaneously transmitting and reflecting reconfigurable intelligent surface aided non-orthogonal multiple access system, which improves the performance of the reflected user and yields a larger throughput through a joint power and discrete amplitude allocation scheme.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2022)
Article
Telecommunications
Ibrahim Yildirim, Fatih Kilinc, Ertugrul Basar, George C. Alexandropoulos
Summary: The letter introduces two hybrid transmission schemes combining RIS with decode-and-forward relaying, offering an efficient solution for coverage extension. A sequential optimization algorithm for power allocation and RIS phase configurations is presented to enhance achievable rate and error performance. The simulations and analysis show that RIS and relaying technologies complement each other, leading to remarkable improvements in performance.
IEEE COMMUNICATIONS LETTERS
(2021)
Article
Computer Science, Information Systems
Phuong T. Tran, Ba Cao Nguyen, Tran Manh Hoang, Tan N. Nguyen
Summary: This article proposes the integration of multiple reconfigurable intelligent surfaces (RISs) with a relay to improve the performance of a low-power wide-area (LPWA) network. The use of RISs enhances the intermediate links between the IoT sensor and the relay, as well as between the relay and the gateway, resulting in better performance for the network. The article also investigates the impact of various factors such as RIS placement, Nakagami-m parameters, data transmission rate, and modulation scheme on the performance of the network.
IEEE TRANSACTIONS ON MOBILE COMPUTING
(2023)
Article
Computer Science, Information Systems
Ping Yang, Liang Yang, Weichao Kuang, Shanjin Wang
Summary: This letter investigates the outage probability of an RIS-aided cognitive radio network, where the reconfigurable intelligent surface is used to eliminate interference from the secondary transmitter. The closed-form expression and asymptotic outage probability at high SNR are derived in this study. Simulation results validate the analysis and demonstrate significant performance gains over different schemes.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Pouya Agheli, Hamzeh Beyranvand, Mohammad Javad Emadi
Summary: This paper proposes a RIS-assisted FSO system that outperforms relay-assisted systems in terms of data rates and coverage area. The study shows that utilizing RIS technology can reduce the number of required base stations and handover processes. The results are verified through Monte-Carlo simulations.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
K. Srinivasarao, M. Surendar
Summary: Cooperative communication and non-orthogonal multiple access play a key role in increasing service quality and aiding dense networks. A novel relay selection scheme is proposed to lower outage probability and its performance is analyzed.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2022)
Article
Telecommunications
Shuhao Zeng, Hongliang Zhang, Boya Di, Zhu Han, Lingyang Song
Summary: This letter analyzes the coverage of a downlink RIS-assisted network with one base station (BS) and one user equipment (UE). An RIS placement optimization problem is formulated to maximize the cell coverage by optimizing the RIS orientation and horizontal distance. A coverage maximization algorithm (CMA) is proposed to solve the problem, with a closed-form optimal RIS orientation obtained, and numerical results verifying the analysis.
IEEE COMMUNICATIONS LETTERS
(2021)
Article
Chemistry, Analytical
Paula Tilleria Lucero, Henry Carvajal Mora, Nathaly Orozco Garzon, Fernando Almeida Garcia
Summary: This work investigates a wireless network that employs a dual-hop decode-and-forward (DF) relaying protocol, where both the relay and the base station (BS) use antenna arrays and received signals are combined using equal-gain combining (EGC). Exact and asymptotic expressions for the system's outage probability (OP) and average bit error probability (ABEP) are derived, providing insights on the impact of system and fading parameters on the performance of the DF-EGC system. Monte Carlo simulations and numerical results are used to evaluate the mean achievable rate of the system and gain further understanding of its performance.
Article
Engineering, Electrical & Electronic
Mohammad Taghi Dabiri, Mazen Hasna
Summary: In this study, we propose a UAV-assisted heterogeneous network as a cost effective and easy to deploy solution for transferring traffic of distributed small cells to the core network. We accurately model the mmWave channel between SBSs and NFP by considering real parameters such as UAV's vibrations, SBSs' distribution, UAVs' positions, antenna pattern and interference. We derive closed-form expressions for the SINR, outage probability and channel capacity of the UAV-based mmWave uplinks, and verify their accuracy through Monte Carlo simulations. We also investigate the impact of different channel parameters on the performance of the UAV-based uplink channel.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Mohammad Taghi Dabiri, Mazen Hasna, Walid Saad
Summary: In this paper, a UAV-based heterogeneous network is studied to address the problem of transferring traffic from distributed small cells to the core network. The authors develop a detailed 3D model of the downlink channel, taking into account factors such as antenna pattern, UAV vibrations, random distribution of small cell base stations, and UAV positions in 3D space. Interference analysis is performed for intra-cell and inter-cell interference, and the results are used to derive an upper bound on the system's outage probability. The numerical results demonstrate the consistency between the analytical and simulation results, highlighting the tradeoff between increasing pattern gain and decreasing interference in the presence of UAV vibrations.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Muhammad Salman Bashir, Mohamed-Slim Alouini
Summary: Unmanned aerial vehicles (UAV) could be used as base stations and backhaul relays in the next generation of wireless communication systems due to their flexibility and low cost deployment. However, their operation time is limited in the untethered mode due to limited battery energy. This study analyzes the simultaneous lightwave information and power transfer (SLIPT) scheme for laser-powered decode-and-forward UAV relays in an optical wireless backhaul. The goal is to optimally allocate the received beam energy to maximize quality-of-service metrics and maximize the UAV relay's operational time while meeting a minimum quality-of-service requirement.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2023)
Article
Computer Science, Hardware & Architecture
Gaofeng Pan, Haoxing Zhang, Rui Zhang, Shuai Wang, Jianping An, Mohamed-Slim Alouini
Summary: This study introduces novel space simultaneous-information and power-transfer (SSIPT) schemes to overcome the limited on-board power of miniaturized satellites. The SSIPT schemes aim to extend the satellites' lifetime and reduce manufacturing and launching costs. Two types of transceivers for SSIPT-miniaturized satellites are introduced, and several designs of SSIPT-miniaturized satellite systems are presented. Numerical results confirm the advantages of SSIPT. Finally, the challenges and future directions are outlined and investigated.
IEEE WIRELESS COMMUNICATIONS
(2023)
Article
Computer Science, Hardware & Architecture
Ahmed Magbool, Hadi Sarieddeen, Nour Kouzayha, Mohamed-Slim Alouini, Tareq Y. Al-Naffouri
Summary: This work investigates the prospects and challenges of combining algorithmic and spectrum enablers in THz-band NOMA communications, focusing on power-domain NOMA with successive interference cancellation and MIMO systems. The scalability of THz-NOMA beamforming, clustering, and spectrum/power allocation algorithms are studied at the system level, while challenges in channel estimation, data detection, and computational complexity are highlighted at the link level.
IEEE WIRELESS COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Mohammad Arif, Mazen O. Hasna
Summary: This paper investigates the performance of a U-V2X network in the presence of UAV fluctuations. By modeling the UAVs and vehicular-nodes, the association probability and success probability of various links are derived, and the effect of different network settings is quantified. The research reveals that V2X networks provide more reliable connectivity for UAVs, especially in less dense areas.
PHYSICAL COMMUNICATION
(2023)
Article
Engineering, Electrical & Electronic
Yu Tian, Gaofeng Pan, Hesham ElSawy, Mohamed-Slim Alouini
Summary: Satellite-aerial communication (SAC) is studied in this research, considering the importance of SAC in the sixth-generation wireless networks. The study includes a SAC system with a geostationary satellite, a target aircraft, and interfering aircraft. By introducing safety distances and two approximation models, the uplink coverage probability and coverage probability of the aviation use case are investigated.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Praveen Kumar Singya, Behrooz Makki, Antonio D'Errico, Mohamed-Slim Alouini
Summary: This paper considers a hybrid free-space optics (FSO)/ teraHertz (THz) based backhaul network for high-data-rate reliable communication. A soft switching method is introduced at the access point (AP) to minimize the effect of back-and-forth switching and compared with a hard switching method. Selective decode-and-forward relaying is considered at the AP. The effects of various parameters on network performance are studied.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Yalcin Ata, Mohamed-Slim Alouini
Summary: This paper investigates the performance of HAPS-based FSO communication links, including downlink, uplink, and horizontal link communications. Attenuation loss, atmospheric turbulence, pointing error, and AOA are taken into account. The application of adaptive optics correction, using Zernike polynomials representation, is analyzed. Analytical expressions for PDF, CDF, Rytov variance, adaptive optics filter function, and outage probability are obtained. Selected results are presented based on various parameters. The improvement of performance with adaptive optics correction is studied.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2023)
Article
Computer Science, Information Systems
Sutanu Ghosh, Arafat Al-Dweik, Mohamed-Slim Alouini
Summary: This article studies the end-to-end uplink and downlink outage probability of an IoT network with RF energy harvesting. The impact of various system parameters on the network performance is analyzed and the results show that the harvesting time and the assumption of successive interference cancelation significantly affect the system outage probability.
IEEE INTERNET OF THINGS JOURNAL
(2023)
Article
Computer Science, Information Systems
Hongjiang Lei, Haosi Yang, Ki-Hong Park, Imran Shafique Ansari, Jing Jiang, Mohamed-Slim Alouini
Summary: This paper investigates the security of aerial underlay Internet of Things systems by jointly designing trajectory and user scheduling. It proposes an iterative algorithm based on block coordinate descent and successive convex approximation to optimize the secrecy performance. Numerical results demonstrate the effectiveness of the proposed algorithm and the improvement in secrecy performance.
IEEE INTERNET OF THINGS JOURNAL
(2023)
Article
Computer Science, Information Systems
Ganghui Lin, Ahmed Elzanaty, Mohamed-Slim Alouini
Summary: This article comprehensively analyzes LB modulation from temporal, spectral, and error performance characteristics. The analysis shows that out-of-band emissions for LB satisfy regulations only when considering a relatively large number of loads. The ML decoder can achieve performance similar to conventional LoRa with a moderate number of loads.
IEEE INTERNET OF THINGS JOURNAL
(2023)
Article
Computer Science, Information Systems
Abdullah Alghaihab, Amr M. Ragheb, Ammar El Falou, Pervez Z. Khan, Ibrahim Y. Alhawas, Moath M. Almanea, Ayman Maghrabi, Mohammad S. Aljanoobi, Mohammed A. Alabdulqader, Abdulah Jeza Aljohani, Ali H. Muqaibel, Mohamed-Slim Alouini, Saleh A. Alshebeili
Summary: In this paper, a simulation-based study is conducted to analyze the coexistence of an International Mobile Telecommunication (IMT) system and a Digital Terrestrial Television Broadcasting (DTTB) system in the sub-700 MHz band. The study examines interference analysis results in different terrains of Saudi Arabia and aims to provide recommendations for the coexistence of these two systems.
Article
Computer Science, Information Systems
Gaofeng Pan, Jia Ye, Jianping An, Mohamed-Slim Alouini
Summary: Large low earth orbit (LEO) mega-constellation systems are deployed to provide global connectivity, but setting up long-distance connections with low latency is challenging due to high traffic load/congestion. Introducing third-party relays can improve latency performance for wide-area real-time traffic, but it degrades signal reliability. This work analyzes an LEO satellite-terrestrial communication scenario and investigates end-to-end time delay and outage performance under different relay-assisted transmission scenarios, considering the randomness of user and relay positions.
IEEE TRANSACTIONS ON MOBILE COMPUTING
(2023)
Article
Telecommunications
Yalcin Ata, Mohamed-Slim Alouini
Summary: This paper analyzes the outage performance of the maritime free-space optical (FSO) communication system and proposes a new maritime FSO link configuration. The channel model for maritime FSO link takes into account the combined effects of turbulence, pointing error, angle-of-arrival (AOA) fluctuations, and attenuation. The outage probability and statistics of the maritime communication channel are derived analytically. The results provide insights into the performance of maritime FSO communication systems under various environmental and system parameters.
FRONTIERS IN COMMUNICATIONS AND NETWORKS
(2023)
