Related references
Note: Only part of the references are listed.
Article
Automation & Control Systems
Deepak Saluja et al.
Summary: This article proposes an exponential windowing scheme (EWS) for improving the scalability of LoRa networks. The scheme maximizes the success probability of the overall network by assigning a distance parameter to each spreading factor. It is shown to outperform existing distance-based schemes.
IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS
(2022)
Article
Computer Science, Information Systems
Van-Duc Phan et al.
Summary: This paper explores the advantages of multiple reconfigurable intelligent surfaces (RISs) in wireless systems, specifically in a cooperative communication system combining reflecting links from RISs and a direct link. The performance of the cooperative RIS-D system is analyzed over Nakagami-$m$ fading channels, and it is found that the cooperative RIS-D system has a significantly lower symbol error probability (SEP) compared to a single-input single-output (SISO) system. Furthermore, increasing the number of RISs or the number of reflecting elements in the RISs can greatly reduce the SEP of the cooperative RIS-D system.
Article
Computer Science, Information Systems
Jiangbin Lyu et al.
Summary: LoRa networks enable long-range connectivity for low-cost and power-constrained user equipments (UEs). However, resource allocation and fairness are challenging issues. This paper utilizes stochastic geometry and proposes an iterative balancing method to address these problems effectively.
IEEE INTERNET OF THINGS JOURNAL
(2022)
Article
Automation & Control Systems
Emiliano Sisinni et al.
Summary: This article discusses the use of LoRaWAN solution for emergency and alarm communications, successfully overcoming the limits of reliability and timeliness by using a message replication scheme and low-cost repeaters. Experimental results show significant improvements in success ratio and data extraction rate in different scenarios.
IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS
(2022)
Article
Telecommunications
Qingyu Bie et al.
Summary: In this paper, we investigate an RIS-aided wireless relaying system and derive closed-form expressions for the achievable rate and optimal RIS deployment. We propose a solution to the non-convex problem of optimizing the RIS deployment and provide insights on the optimal strategy. The results demonstrate that the RIS and relay can complement each other and significantly improve the rate performance.
IEEE TRANSACTIONS ON GREEN COMMUNICATIONS AND NETWORKING
(2022)
Article
Engineering, Electrical & Electronic
Xidong Mu et al.
Summary: The study investigates intelligent reflecting surface (IRS) enhanced multi-unmanned aerial vehicle (UAV) non-orthogonal multiple access (NOMA) networks, proposes a new transmission framework, and develops a block coordinate descent (BCD)-based iterative algorithm. Optimization of UAV placement, IRS reflection matrix, and NOMA decoding orders maximizes the total rate of the network.
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Tri Nhu Do et al.
Summary: This paper studies the statistical characterization and modeling of distributed multi-reconfigurable intelligent surface (RIS)-aided wireless systems, proposing two purpose-oriented multi-RIS-aided schemes – exhaustive RIS-aided (ERA) and opportunistic RIS-aided (ORA). The findings show that the ERA scheme outperforms the ORA scheme in terms of outage probability (OP) and ergodic capacity (EC), with the reflecting element and location settings of RISs having a significant impact on system performance under independent but not identically distributed (i.n.i.d.) fading channels.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2021)
Article
Computer Science, Information Systems
Liang Yang et al.
Summary: This letter investigates a network assisted by multiple reconfigurable intelligent surfaces and analyzes the outage probability and average sum-rate to demonstrate its performance. The results show that the number of RISs and reflecting elements are crucial for network capacity, and the proposed system setup outperforms relay-aided systems in terms of performance.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2021)
Article
Computer Science, Information Systems
Weidong Mei et al.
Summary: Intelligent reflecting surface (IRS) is considered as a revolutionary technology for achieving smart and reconfigurable wireless communication environments. In this study, a new IRS-aided communication system is proposed, where multiple IRSs assist in establishing multi-hop signal reflection between a multi-antenna base station and a single-antenna user. By maximizing the received signal power at the user, the optimal active and cooperative passive beamforming solutions for a given beam route are provided, revealing a trade-off between passive beamforming gain and multi-reflection path loss in optimal beam routing design. The proposed algorithm shows significant performance gains over benchmark schemes in numerical results.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2021)
Article
Telecommunications
Xiuhong Wei et al.
Summary: The reconfigurable intelligent surface (RIS) technology is seen as a promising technique for future 6G communications due to its low hardware cost and energy consumption. Accurate channel state information (CSI) is vital for joint beamforming at the base station (BS) and the RIS in RIS-assisted wireless communication systems. This paper provides an overview of the fundamentals and solutions for channel estimation in such systems, with a new low pilot overhead channel estimation scheme to be introduced in the second part of the letter.
IEEE COMMUNICATIONS LETTERS
(2021)
Article
Telecommunications
Ibrahim Yildirim et al.
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
Telecommunications
Xiuhong Wei et al.
Summary: This paper proposes to reduce pilot overhead in RIS assisted wireless communication system by exploiting the double-structured sparsity of the angular cascaded channels among users, and introduces the double-structured orthogonal matching pursuit (DS-OMP) algorithm. Simulation results demonstrate that the pilot overhead required by the proposed scheme is lower than existing schemes.
IEEE COMMUNICATIONS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Hongxu Zhu et al.
Summary: LPWANs are emerging IoT technologies that support smart city development, with different applications requiring different characteristics of LPWANs. The IEEE P2668 IDex Working Group is developing a standard to evaluate IoT objects' performance, including a sub-index called LPWAN-I for smart selection of LPWANs for specific applications. Challenges and future development of LPWAN-I are also discussed.
IEEE COMMUNICATIONS MAGAZINE
(2021)
Article
Engineering, Electrical & Electronic
Xuan Nam Tran et al.
Summary: This paper combines energy harvesting at wireless sensor and cooperative communications for LPWA systems. Mathematical analysis is used to derive performance metrics and obtain optimal time switching ratio. Results show the impact of distance, path loss exponent, and data transmission rate, with using half of transmission blocks for EH maximizing system performance.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Huan Ma et al.
Summary: This paper introduces MIMO configuration and STBC schemes to improve the performance of LoRa system in fading-channel environments, and investigates the theoretical performance, deriving an approximate BER expression and analyzing diversity order and throughput. The results show that under specific conditions, the system can achieve full diversity effects.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Weidong Mei et al.
Summary: Intelligent reflecting surface (IRS) is proposed to improve spectral and energy efficiency in wireless communications. In this paper, a new IRS-user/BS association problem is addressed to optimally balance passive beamforming gains among different communication links. The proposed solutions show significant performance gains over benchmark schemes.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2021)
Proceedings Paper
Computer Science, Information Systems
Mohanad Obeed et al.
Summary: Reconfigurable intelligent surfaces (RIS) have controllable scattering elements that can direct electromagnetic waves, and proposed multi-user communication system optimizing RIS elements and beamforming matrices to minimize total transmit power while meeting quality-of-service (QoS) constraint. Suboptimal solutions based on singular value decomposition (SVD) and uplink-downlink duality, as well as SVD combined with zero-forcing, outperform systems with only relay or RIS, especially in closer proximity to users than base station.
2021 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS WORKSHOPS (ICC WORKSHOPS)
(2021)
Proceedings Paper
Telecommunications
Nipuni Ginige et al.
Summary: In this paper, a deep learning-based, low complexity channel estimator is proposed for RIS-assisted systems, which improves the accuracy of channel estimation with lower complexity. The proposed method is shown to outperform conventional methods in terms of accuracy and complexity, and is robust to hardware impairments at the transceiver and RIS.
2021 IEEE 32ND ANNUAL INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS (PIMRC)
(2021)
Article
Engineering, Electrical & Electronic
L. Gallego Manzano et al.
Summary: CERN has developed a reliable and highly scalable IoT end-to-end data infrastructure for environmental radiation monitoring using LPWAN, called W-MON. The system consists of thousands of sensitive, ultralow-power sensors that continuously measure radiation levels in waste containers and send data to the network server.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Review
Computer Science, Information Systems
Panagiotis Gkotsiopoulos et al.
Summary: LoRa radio technology is a prominent choice in the Internet of Things Low-Power Wide Area Networks industry due to its versatile technical characteristics. The capacity metric in LoRa networks is influenced by various factors and parameters. This survey reviews research on LoRa-based networks, highlighting performance determinants in five main categories including physical layer characteristics, deployment and hardware features, end device transmission settings, LoRa MAC protocols, and application requirements.
IEEE COMMUNICATIONS SURVEYS AND TUTORIALS
(2021)
Article
Computer Science, Information Systems
Felipe S. Dantas Silva et al.
Summary: LoRaWAN enables flexible long-range service communications suitable for various IoT applications, but the densification needed to meet networking requirements poses challenges, including interference in urban areas. The optimization of LoRaWAN in five key aspects directly impacts its performance, and further research is essential to address these challenges.
Article
Computer Science, Information Systems
Ba Cao Nguyen et al.
Summary: This paper investigates the application of reconfigurable intelligent surface in a two-way full-duplex wireless communication system, analyzing the performance advantages compared to traditional relay. Mathematical expressions for system performance in different scenarios are derived and validated through Monte-Carlo simulations.
Article
Engineering, Electrical & Electronic
Ankur Bansal et al.
Summary: The paper focuses on improving the performance of multiuser MISO downlink networks using multiple IRSs and hierarchical rate splitting technique. A switch scheme for controlling IRSs and the outperformance of the proposed framework in comparison with other technologies are demonstrated through extensive Monte Carlo simulations.
IEEE OPEN JOURNAL OF THE COMMUNICATIONS SOCIETY
(2021)
Article
Engineering, Electrical & Electronic
Ibrahim Yildirim et al.
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
Qingqing Wu et al.
IEEE COMMUNICATIONS MAGAZINE
(2020)
Article
Engineering, Electrical & Electronic
Qingqing Wu et al.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2020)
Article
Computer Science, Information Systems
Emil Bjornson et al.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2020)
Article
Computer Science, Information Systems
Chang Seok You et al.
Article
Engineering, Electrical & Electronic
Saman Atapattu et al.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2020)
Article
Computer Science, Information Systems
Atluri Hemanth et al.
Article
Engineering, Electrical & Electronic
Tianwei Hou et al.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2020)
Article
Engineering, Electrical & Electronic
Zhaorui Wang et al.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2020)
Article
Engineering, Electrical & Electronic
Marco Di Renzo et al.
IEEE OPEN JOURNAL OF THE COMMUNICATIONS SOCIETY
(2020)
Article
Computer Science, Information Systems
Alexandros-Apostolos A. Boulogeorgos et al.
Article
Computer Science, Information Systems
Tao Jiang et al.
IEEE INTERNET OF THINGS JOURNAL
(2019)
Article
Computer Science, Information Systems
Ertugrul Basar et al.
Article
Engineering, Electrical & Electronic
Cheng Li et al.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2017)
Article
Engineering, Electrical & Electronic
Dushyantha A. Basnayaka et al.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2016)
Article
Materials Science, Multidisciplinary
V. S. Asadchy et al.
Article
Engineering, Electrical & Electronic
Hongyu Cui et al.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2014)
Article
Telecommunications
Daniel Benevides da Costa et al.
IEEE COMMUNICATIONS LETTERS
(2011)
Article
Engineering, Electrical & Electronic
ZD Wang et al.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2003)
