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Article
Computer Science, Information Systems
Xiaohui Gu et al.
Summary: This article investigates the physical layer security in reconfigurable intelligent surface (RIS)-aided wireless communication systems. Two scenarios are studied for RIS-aided secure communication systems, taking into account the location uncertainty of the eavesdropper and the design of the RIS. Closed-form expressions for the nonzero secrecy capacity, ergodic secrecy capacity, and secrecy outage probability are derived, providing insights into the system's energy efficiency and the tradeoff between the number of RIS elements.
IEEE SYSTEMS JOURNAL
(2023)
Article
Telecommunications
Chaojin Qing et al.
Summary: This letter proposes an enhanced extreme learning machine (ELM)-based channel estimation method to improve the accuracy of channel estimation in reconfigurable intelligent surface (RIS)-assisted orthogonal frequency division multiplexing (OFDM) systems. The method utilizes least square (LS) estimation and an enhanced ELM network to highlight linear features and enhance the recognition of nonlinear factors. Experimental results show that the proposed method achieves lower normalized mean square error (NMSE) and exhibits robustness against parameter variations given insufficient cyclic prefix (CP) and imperfect hardware.
IEEE COMMUNICATIONS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Aymen Khaleel et al.
Summary: This paper proposes a novel solution that combines RIS with NOMA to improve spectrum efficiency and user fairness. By distributing physical resources to different user clusters, the authors solve a complex optimization problem using three efficient search algorithms. Simulation results show that the proposed system outperforms benchmark systems in multiple performance metrics.
IEEE JOURNAL OF SELECTED TOPICS IN SIGNAL PROCESSING
(2022)
Article
Engineering, Electrical & Electronic
Mohamed Elhattab et al.
Summary: This paper investigates the integration of reconfigurable intelligent surface (RIS) with downlink non-orthogonal-multiple-access (NOMA) in a multi-user two-cell network assisted by the joint-transmission coordinated multipoint (JT-CoMP). It jointly optimizes the power allocation at the base stations, the user clustering policy, and the phase-shift matrix of the RIS to maximize the network sum-rate. The results show that the proposed RIS-assisted CoMP NOMA networks outperform other schemes in terms of network sum-rate.
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Zheng Zhang et al.
Summary: This paper investigates the security enhancement of an intelligent reflecting surface (IRS) assisted non-orthogonal multiple access (NOMA) network. The problem of maximizing the minimum secrecy rate among users is formulated, and algorithms are proposed for both single-antenna and multi-antenna base station cases. Numerical results demonstrate the advantages of the proposed algorithms and discuss the optimal strategy for distributed IRS deployment.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2022)
Article
Telecommunications
Kangda Zhi et al.
Summary: This letter theoretically compares the performance difference between the active RIS and the passive RIS, and demonstrates that the active RIS outperforms the passive RIS when the budget is relatively large and the number of RIS elements is relatively small.
IEEE COMMUNICATIONS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Kangda Zhi et al.
Summary: This paper investigates an uplink reconfigurable intelligent surface (RIS)-aided massive multiple-input multiple-output (MIMO) system, where the phase shifts of the RIS are designed based on statistical channel state information (CSI). The study adopts the general Rician channel model for both the users-RIS links and RIS-BS links in consideration of the complex environment. Closed-form approximate expressions for achievable rate are derived, which are applicable to arbitrary numbers of base station (BS) antennas and RIS elements. Insights on asymptotic rate performance, power scaling laws, and impacts of various system parameters on achievable rate are provided using the derived expressions. The optimization of phase shifts at the RIS using a genetic algorithm (GA) is applied to address sum-rate maximization and minimum user rate maximization problems. Extensive simulations demonstrate the benefits of integrating RIS into conventional massive MIMO systems and the feasibility of deploying large-size but low-resolution RIS in such systems.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Siqi Ma et al.
Summary: This research establishes a communication system model considering blocked RIS and proposes a variational Bayesian based channel estimation algorithm that is robust in estimating both channel information and RIS blockage.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Wei Wang et al.
Summary: This paper proposes an IRS-assisted NOMA scheme to achieve secure communication via artificial jamming. By optimizing the transmit beamforming, the jamming vector, and the IRS reflecting vector, the sum rate of legitimate users is maximized. Numerical results demonstrate the effectiveness of the proposed scheme in ensuring secure transmission.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Tianqi Wang et al.
Summary: This paper proposes a low-complexity scheme to improve the energy efficiency in a RIS-assisted NOMA system. By decomposing the original problem into two subproblems and using alternating optimization to solve them iteratively, a scheme that achieves superior energy efficiency is provided.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2022)
Article
Computer Science, Information Systems
Mingxing Wang et al.
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
Telecommunications
Boqun Zhao et al.
Summary: This letter analyzes the ergodic rates of a STAR-RIS aided NOMA system and derives closed-form expressions for ergodic rates and high SNR slopes. Numerical results show that STAR-RIS aided NOMA systems achieve higher ergodic rates compared to conventional RIS aided NOMA systems.
IEEE COMMUNICATIONS LETTERS
(2022)
Article
Computer Science, Information Systems
Demos Serghiou et al.
Summary: This paper examines the channel propagation characteristics, measurement capabilities, and modeling techniques for 6G communication applications in the Terahertz band. It provides guidelines and recommendations based on recent measurement campaigns and modeling efforts, and discusses the challenges and limitations of measurement and modeling at such high frequencies. The paper also contemplates the future research outlook towards realizing the vision of 6G.
IEEE COMMUNICATIONS SURVEYS AND TUTORIALS
(2022)
Proceedings Paper
Acoustics
Khaled Ardah et al.
Summary: This paper investigates a double-RIS-aided MIMO system and proposes an alternating least-squares-based channel estimation method. By exploiting the Tucker2 tensor structure of the received signals, the cascaded MIMO channel parts can be estimated separately, reducing training overhead and improving estimation accuracy. Compared to single-RIS systems, double-RIS systems can further increase the coverage, capacity, and efficiency of future wireless networks.
2022 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING (ICASSP)
(2022)
Proceedings Paper
Computer Science, Information Systems
Wenhan Shen et al.
Summary: This paper proposes a federated deep residual learning neural network (FDReLNet)-based channel estimation framework in an RIS-aided multi-user OFDM system. By updating a deep residual neural network on a local dataset and sending only model weights to the base station (BS), a global model is trained. Simulation results demonstrate that the proposed FDReLNet can significantly reduce transmission overhead while maintaining satisfactory channel estimation accuracy.
2022 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS WORKSHOPS (ICC WORKSHOPS)
(2022)
Article
Engineering, Electrical & Electronic
Mohd Hamza Naim Shaikh et al.
Summary: This work investigates the impact of hardware impairments on the performance of the RIS-aided NOMA wireless network. The results show that hardware impairments significantly deteriorate the performance of RIS-aided NOMA compared to RIS-aided OMA. Additionally, the gains of RIS-aided NOMA are more significant compared to full-duplex relaying based NOMA.
IEEE OPEN JOURNAL OF SIGNAL PROCESSING
(2022)
Proceedings Paper
Computer Science, Information Systems
Jialin Wu et al.
Summary: The reconfigurable intelligent surface (RIS) has the ability to manipulate wireless communication environment, but suffers from high pilot overhead in channel estimation due to the large number of passive elements. To address this, we propose an improved algorithm that enhances channel estimation accuracy and reduces pilot overhead.
2022 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE (WCNC)
(2022)
Article
Telecommunications
Shuhao Zeng et al.
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
Engineering, Electrical & Electronic
Yang Zhang et al.
Summary: This paper investigates the characteristics of HF massive MIMO systems with CPA in the presence of MC, showing that the randomness of the channel decreases asymptotically, which is conducive to communication system design. By applying random matrix theory, the optimal beamforming to maximize SINR is derived, with numerical results confirming the accuracy and performance superiority of the proposed scheme.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2021)
Article
Computer Science, Information Systems
Kyusung Shim et al.
Summary: This study introduces a full-duplex NOMA system and a minimal transmitter selection scheme to enhance secure transmission in the presence of an active eavesdropper. By having cell-center and cell-edge users act as both receivers and jammers, the scheme aims to degrade the eavesdropper channel condition, while opportunistically selecting transmitters to minimize eavesdropper channel capacity. The proposed methods show improvement in secrecy outage probability and secrecy sum throughput, with the deep neural network model closely approximating other evaluation methods such as Monte-Carlo simulations and analytical expressions.
IEEE INTERNET OF THINGS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Qingqing Wu et al.
Summary: Intelligent reflecting surface (IRS) is a technology that can alter wireless signal propagation in wireless networks by dynamically changing wireless channels to enhance communication performance. The future hybrid wireless network aided by IRS, comprising both active and passive components, is expected to achieve sustainable capacity growth cost-effectively.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2021)
Article
Computer Science, Information Systems
Zhiqing Tang et al.
Summary: This letter proposes a novel design of RIS to enhance physical layer security in the RIS-aided NOMA network. The design solves the issue of increasing RIS elements damaging secrecy performance, and allows networks to use traditional channel coding schemes for achieving secrecy. Results indicate that the novel RIS design is effective in enhancing secrecy performance.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2021)
Article
Computer Science, Information Systems
Gui Zhou et al.
Summary: This study focuses on optimizing transmission design for a secure communication system with reconfigurable intelligent surfaces in the presence of transceiver hardware impairments. The proposed scheme maximizes secrecy rate while ensuring power and unit-modulus constraints, using alternate optimization with SCA and SDP methods. Results show that the new design is more robust than conventional non-robust schemes.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Zhe Zhang et al.
Summary: This paper investigates the physical layer security (PLS) for a RIS-aided NOMA 6G networks, where a RIS is deployed to assist two dead zone NOMA users and internal/external eavesdropping are considered. The proposed joint beamforming and power allocation scheme aims to improve system PLS, with superior performance shown in simulation results. Increasing the number of reflecting elements is found to bring more gain in secrecy performance than increasing the number of transmit antennas.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2021)
Article
Computer Science, Information Systems
Animesh Yadav et al.
Summary: The letter examines a novel multiple-antenna hybrid-domain non-orthogonal multiple access (MA-HD-NOMA) scheme and formulates a joint resource allocation problem to maximize the system's total rate. It compares the scheme with multi-antenna SCMA and multi-antenna PD-NOMA schemes with the same overloading factor, using successive convex approximation and reweighted 1 minimization-based approaches for rapid convergence, with results showing superior performance of the proposed MA-HD-NOMA scheme.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2021)
Article
Computer Science, Information Systems
Emil Bjornson et al.
Summary: The channel model is crucial for evaluating the performance of wireless technologies. The traditional Rayleigh fading channel model is not applicable when using reconfigurable intelligent surfaces (RIS), and an alternative physically feasible model is needed for evaluation.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2021)
Article
Computer Science, Information Systems
Yuanwei Liu et al.
Summary: Reconfigurable intelligent surfaces, also known as intelligent reflecting surfaces or large intelligent surfaces, have attracted significant attention for their potential to enhance wireless networks by smartly reconfiguring the propagation environment. Research in this field covers operating principles, performance evaluation, beamforming design, resource management, machine learning applications, and integration with other emerging technologies for next-generation networks.
IEEE COMMUNICATIONS SURVEYS AND TUTORIALS
(2021)
Article
Engineering, Electrical & Electronic
Hong Shen et al.
Summary: This paper focuses on intelligent reflecting surface (IRS) assisted multi-antenna communications with transceiver hardware impairments, aiming to maximize the received signal-to-noise ratio (SNR) through joint design of source transmit beamforming and IRS reflect beamforming. By deriving closed-form optimal solution for source transmit beamforming and obtaining an upper bound to the optimal objective value for IRS reflect beamforming, a low-complexity minorization-maximization (MM) algorithm was developed to approach the upper bound. Simulation results show that the proposed beamforming design is more robust to hardware impairments and achieves better performance gain in IRS-aided communications compared to conventional SNR maximized scheme.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Qingqing Wu et al.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2020)
Article
Engineering, Electrical & Electronic
Boya Di et al.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2020)
Article
Computer Science, Information Systems
Zhen-Qing He et al.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2020)
Article
Engineering, Electrical & Electronic
Boya Di et al.
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
(2020)
Article
Computer Science, Information Systems
Atluri Hemanth et al.
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Engineering, Electrical & Electronic
Gui Zhou et al.
IEEE TRANSACTIONS ON SIGNAL PROCESSING
(2020)
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Qingqing Wu et al.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2019)
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Kaiming Shen et al.
IEEE TRANSACTIONS ON SIGNAL PROCESSING
(2018)
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Emil Bjornson et al.
FOUNDATIONS AND TRENDS IN SIGNAL PROCESSING
(2017)
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Zhi-Quan Luo et al.
IEEE SIGNAL PROCESSING MAGAZINE
(2010)
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Engineering, Electrical & Electronic
Hajime Suzuki et al.
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
(2008)
Article
Engineering, Electrical & Electronic
W Namgoong
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
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