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Peng Xu et al.
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IEEE COMMUNICATIONS LETTERS
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IEEE COMMUNICATIONS LETTERS
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Qingqing Wu et al.
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Zhangjie Peng et al.
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Yiming Liu et al.
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IEEE WIRELESS COMMUNICATIONS LETTERS
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Samith Abeywickrama et al.
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IEEE WIRELESS COMMUNICATIONS LETTERS
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Andrea Abrardo et al.
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IEEE WIRELESS COMMUNICATIONS LETTERS
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Weidong Mei et al.
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IEEE WIRELESS COMMUNICATIONS LETTERS
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Changsheng You et al.
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IEEE WIRELESS COMMUNICATIONS LETTERS
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Gabriele Gradoni et al.
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IEEE WIRELESS COMMUNICATIONS LETTERS
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Kangda Zhi et al.
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IEEE WIRELESS COMMUNICATIONS LETTERS
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Xiao Chen et al.
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IEEE WIRELESS COMMUNICATIONS LETTERS
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Meng Xu et al.
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Yue Xiu et al.
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IEEE COMMUNICATIONS LETTERS
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Tao Jiang et al.
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Ming-Min Zhao et al.
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IEEE TRANSACTIONS ON COMMUNICATIONS
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Hongyu Li et al.
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IEEE TRANSACTIONS ON COMMUNICATIONS
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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
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Xiaoling Hu et al.
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IEEE TRANSACTIONS ON COMMUNICATIONS
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Jun Wang et al.
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IEEE TRANSACTIONS ON COMMUNICATIONS
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Beixiong Zheng et al.
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IEEE TRANSACTIONS ON COMMUNICATIONS
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Ziwei Wan et al.
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IEEE TRANSACTIONS ON COMMUNICATIONS
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Jiguang He et al.
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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
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Zhe Xing et al.
Summary: Intelligent reflecting surface (IRS) is seen as a promising solution to hardware cost and energy consumption in 5G mobile communication networks. However, hardware impairment (HWI) can lead to performance degradation in IRS-aided wireless communication systems. Despite the negative impact of HWI, opportunities exist for IRS to outperform conventional decode-and-forward (DF) relays in certain scenarios.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
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Yuxing Lin et al.
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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
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Ruizhe Long et al.
Summary: The paper introduces a new type of RIS, called active RIS, which enhances the incoming signal by incorporating active loads to each reflecting element, in contrast to conventional passive RIS systems. However, this amplification may unintentionally boost RIS-correlated noise, requiring optimization of the reflecting coefficient matrix at the RIS and receive beamforming at the receiver to strike a balance between maximizing received signal power and minimizing RIS-related noise.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2021)
Article
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Ming-Min Zhao et al.
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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2021)
Article
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Jun Zhang et al.
Summary: The study focuses on downlink RIS-assisted MIMO wireless communication system, aiming to design optimal transmit covariance matrix at BS and diagonal phase-shifting matrix at RIS to maximize achievable ergodic rate. Results show that using replica method and large-system approximation can enhance system performance.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2021)
Article
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Beixiong Zheng et al.
Summary: Intelligent reflecting surfaces (IRS) have become a cost-effective technology for achieving smart and reconfigurable wireless communication environments. This paper studies a double-IRS assisted multi-user communication system with cooperative passive beamforming design, showing superior performance over conventional single-IRS systems in terms of signal-to-noise ratio and multi-user effective channel rank.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Li You et al.
Summary: This paper discusses the application of reconfigurable intelligent surfaces (RISs) to assist multiuser MIMO uplink transmission, optimizing the transmit covariance matrices of user terminals and the phase shift matrix of RIS to maximize system global energy efficiency (GEE).
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Harsh Tataria et al.
Summary: This article discusses the generational changes in mobile communications, with a focus on the technical requirements, challenges, and possibilities of the sixth generation (6G) wireless systems. With the increasing demand for spectrum utilization, 6G systems will operate in a wider range of frequency bands.
PROCEEDINGS OF THE IEEE
(2021)
Article
Computer Science, Information Systems
Wanming Hao et al.
Summary: This article explores an IRS-aided multiuser THz MIMO system and optimizes the base station analog/digital beamforming and IRS reflection matrix to maximize the weighted sum rate. It proposes an alternatively iterative optimization algorithm and discusses beamforming and reflection matrix design under imperfect CSI in IRS-based systems.
IEEE INTERNET OF THINGS JOURNAL
(2021)
Article
Computer Science, Information Systems
Xufeng Guo et al.
Summary: In this study, a novel algorithm is proposed to enhance the security and robustness of millimeter-wave UAV communication by optimizing the active beamforming of the UAV, the coefficients of RIS elements, and the UAV trajectory. Simulation results demonstrate that RIS can significantly improve the sum secrecy rate.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2021)
Article
Computer Science, Information Systems
Anastasios Papazafeiropoulos et al.
Summary: This study explores the use of multiple distributed intelligent reflecting surfaces (IRSs) in controlling the propagation environment in the presence of correlated Rayleigh fading. By comparing the implementation of a finite number of large IRSs and a large number of finite size IRSs, it is shown that adding more surfaces outperforms adding more elements per surface. The coverage probability is derived in closed-form for both cases using statistical channel state information (CSI) and optimal coverage probability is obtained.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2021)
Article
Computer Science, Information Systems
Xuewen Qian et al.
Summary: The paper introduces algorithms for optimizing a single-input single-output reconfigurable intelligent surface (RIS) assisted system, proposing different optimization methods for different scenarios, and numerically demonstrates the significant impact of mutual coupling on system performance.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2021)
Article
Computer Science, Information Systems
Beixiong Zheng et al.
Summary: This letter introduces a novel communication system design with intelligent reflecting surface (IRS) that optimizes relay and passive reflection for maximizing system rate. Simulation results demonstrate that the proposed design significantly improves the coverage and rate performance of IRS-assisted systems.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2021)
Article
Computer Science, Information Systems
Yue Xiu et al.
Summary: In this study, the uplink of a reconfigurable intelligent surface (RIS)-aided millimeter-wave (mmWave) multi-user system was investigated. By jointly optimizing ADC quantization bits, RIS phase shifts, and beam selection matrix, the achievable rate under hardware constraints was maximized. A block coordinated descent (BCD)-based algorithm was proposed for efficient problem-solving, demonstrating the ability of RIS to mitigate hardware loss and the superiority of the proposed algorithm over state-of-the-art methods in simulations.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2021)
Article
Telecommunications
Jawad Mirza et al.
Summary: This paper addresses channel estimation in reconfigurable intelligent surface (RIS) aided multiple-input multiple-output (MIMO) time-division duplexing systems. It proposes a two-stage channel estimation method for effectively estimating the channels in RIS assisted communication. The paper also introduces a phase shift design for the RIS and uses a BAdVAMP algorithm for RIS channel estimation, outperforming the traditional BiGAMP scheme.
IEEE TRANSACTIONS ON COGNITIVE COMMUNICATIONS AND NETWORKING
(2021)
Article
Telecommunications
Eyad Shtaiwi et al.
Summary: This paper investigates the channel estimation problem for RIS-aided MU-MIMO system, proposing an algorithm to estimate the composite channel, separate RIS-based channels, and direct channel by dividing the entire RIS surface into small sub-RISs and controlling the phase shifts for each sub-RIS unit. The simulation results confirm the efficiency and effectiveness of the proposed approach algorithm.
IEEE TRANSACTIONS ON COGNITIVE COMMUNICATIONS AND NETWORKING
(2021)
Article
Telecommunications
Stefano Buzzi et al.
Summary: Reconfigurable Intelligent Surfaces (RISs) have gained attention for their ability to tune wireless propagation environments and improve system performance. This paper studies a multiuser wireless network assisted by RISs and presents resource allocation algorithms for different scenarios, showing that optimizing beamformers and RIS phase shifts can maximize system performance and signal quality.
IEEE TRANSACTIONS ON COGNITIVE COMMUNICATIONS AND NETWORKING
(2021)
Proceedings Paper
Telecommunications
Zixuan Huang et al.
Summary: This paper investigates a new intelligent refracting surface (IRS)-assisted high-mobility communication scheme. By proposing a new transmission protocol to achieve channel estimation and IRS refraction design, the Doppler effect is mitigated and the passive beamforming gain of the IRS is maximized.
IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC 2021)
(2021)
Proceedings Paper
Telecommunications
Beixiong Zheng et al.
Summary: In this paper, a new and efficient channel estimation scheme is proposed for the double-IRS assisted uplink MIMO communication system to address the CSI of both single- and double-reflection links. The proposed scheme is shown to be effective in simulations compared to benchmark schemes.
IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC 2021)
(2021)
Article
Engineering, Electrical & Electronic
Mohd Hamza Naim Shaikh et al.
Summary: This paper investigates the impact of transceiver hardware imperfections on the performance of IRS-assisted wireless systems, highlighting the significant restrictions on system performance caused by hardware impairments and the importance of modeling and compensating for them.
IEEE OPEN JOURNAL OF THE COMMUNICATIONS SOCIETY
(2021)
Proceedings Paper
Computer Science, Information Systems
Wanning Yang et al.
Summary: This paper investigates channel estimation in practical IRS-aided OFDM systems with discrete phase shifts, and designs a novel IRS time-varying reflection pattern to minimize the error of estimated channels by considering the response characteristics of practical IRS. The research results demonstrate the importance of considering practical IRS models for channel estimation and the effectiveness of the proposed methods.
2021 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE WORKSHOPS (WCNCW)
(2021)
Article
Engineering, Electrical & Electronic
Filippo Costa et al.
Summary: An accurate and simple analytical model for calculating the reflection amplitude and phase of Reconfigurable Intelligent Surfaces was presented. The model, based on a transmission-line circuit representation of the RIS, takes into account the relevant geometrical and electrical parameters to allow for consideration of various effects, such as incidence angle and mutual coupling among elements. The proposed model aims to bridge the gap between RIS communication algorithms and practical implementation issues to improve the realistic performance of these surfaces.
IEEE OPEN JOURNAL OF THE COMMUNICATIONS SOCIETY
(2021)
Article
Computer Science, Information Systems
Shu Sun et al.
Summary: This letter proposes two practical wideband channel estimation schemes for RIS-assisted communication, incorporating Doppler shift adjustment for multi-path and single-path propagation environments. The proposed algorithms demonstrate high CE accuracy and achievable rate with low complexity, outperforming representative benchmark schemes.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2021)
Article
Computer Science, Information Systems
Abdelrahman Taha et al.
Summary: Employing large intelligent surfaces (LIS) to improve coverage and rate of future wireless systems, this paper proposes efficient solutions for channel estimation by leveraging compressive sensing and deep learning tools. The novel LIS architecture with sparse channel sensors and the use of active elements for training overhead reduction show promising advancements in future LIS systems.
Article
Engineering, Electrical & Electronic
Ming-Min Zhao et al.
Summary: This paper investigates the impact of CSI errors on the outage performance in an IRS-aided multiuser downlink communication system and proposes optimization solutions. It first considers the single-user case and derives the user's outage probability based on MSP and received signal variance. For the multiuser case, a novel CSSCA algorithm is proposed to replace non-convex outage probability constraints. Simulation results show the effectiveness and performance improvement of the proposed robust beamforming algorithms over benchmark schemes.
IEEE TRANSACTIONS ON SIGNAL PROCESSING
(2021)
Article
Computer Science, Information Systems
Xiaoming Liu et al.
Summary: The proposed three-step training (TST) scheme in this study effectively combats Pilot Spoofing Attacks (PSA) and can reliably detect PSA while obtaining Channel State Information (CSI). By examining the transmitter's received signal power levels, the scheme can address significant challenges such as uncertain Channel Distribution Information (CDI) and uncertain noise.
Article
Engineering, Electrical & Electronic
Khaled Ardah et al.
Summary: The channel estimation problem in RIS-aided mmWave MIMO systems is addressed by proposing a non-iterative Two-stage RIS-aided Channel Estimation (TRICE) framework, which exploits the low-rank nature of mmWave channels in the angular domains. This framework offers lower training overhead and computational complexity compared to benchmark solutions.
IEEE SIGNAL PROCESSING 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
Jia Ye et al.
Summary: This study compares the performances of decode-and-forward (DF) relays and reconfigurable intelligent surfaces (RISs), finding that RIS is the superior choice in the near-field scenario, improving both outage probability (OP) and energy efficiency (EE) of communication.
IEEE OPEN JOURNAL OF THE COMMUNICATIONS SOCIETY
(2021)
Article
Engineering, Electrical & Electronic
Neel Kanth Kundu et al.
Summary: This study focuses on multi-antenna wireless systems aided by reconfigurable intelligent surfaces (RIS) to improve coverage and energy efficiency by controlling the propagation environment intelligently. Accurate channel estimation is crucial for achieving the anticipated gains of RIS. The authors propose approaches to approximate the optimal MMSE channel estimator, including a linear estimator LMMSE and data-driven nonlinear solutions based on deep learning.
IEEE OPEN JOURNAL OF THE COMMUNICATIONS SOCIETY
(2021)
Article
Engineering, Electrical & Electronic
Li You et al.
Summary: The study focuses on the tradeoff between energy efficiency and spectral efficiency in multiuser MIMO uplink communications aided by reconfigurable intelligent surfaces. A transmission strategy based on partial channel state information and joint optimization of transmit precoding and reflective beamforming is developed to maximize resource efficiency. Numerical results show the effectiveness and rapid convergence rate of the proposed optimization framework.
IEEE TRANSACTIONS ON SIGNAL PROCESSING
(2021)
Article
Engineering, Electrical & Electronic
Shaoe Lin et al.
Summary: In this paper, a system utilizing reconfigurable intelligent surfaces for passive beamforming and information transfer is proposed, with active and passive beamforming jointly optimized to maximize received signal power. A high-quality suboptimal solution is proposed based on Rician fading conditions and finite constellation assumptions, showing superior achievable rate compared to traditional RIS-assisted systems in simulation results.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(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
Telecommunications
Wenhui Zhang et al.
Summary: In this study, we optimized the channel estimator of the cascaded channel in an IRS-assisted mmWave multi-antenna system. The proposed method leverages typical MSE criterion to derive a closed-form optimized channel estimator, and generalizes the approach by exploiting channel sparsity for further performance enhancement and computational complexity reduction. Simulation results demonstrate significant performance improvement over existing estimators.
IEEE COMMUNICATIONS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Gui Zhou et al.
Summary: This paper analyzes a mmWave communication system assisted by multiple reconfigurable intelligent surface (RISs) to enhance network reliability and connectivity in the presence of random blockages. The proposed algorithm, based on the stochastic block gradient descent method, improves beamforming robustness by learning sensible blockage patterns without exhaustive search. Numerical results confirm the algorithm's performance benefits in terms of outage probability and effective data rate.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Qingqing Wu et al.
IEEE COMMUNICATIONS MAGAZINE
(2020)
Article
Telecommunications
Beixiong Zheng et al.
IEEE COMMUNICATIONS LETTERS
(2020)
Article
Telecommunications
Zhiguo Ding et al.
IEEE COMMUNICATIONS LETTERS
(2020)
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IEEE TRANSACTIONS ON COMMUNICATIONS
(2020)
Article
Engineering, Electrical & Electronic
Hongliang Zhang et al.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2020)
Article
Computer Science, Information Systems
Zhen-Qing He et al.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2020)
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Computer Science, Information Systems
Emil Bjornson et al.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2020)
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Computer Science, Information Systems
Mihai-Alin Badiu et al.
IEEE WIRELESS COMMUNICATIONS LETTERS
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Computer Science, Information Systems
Keming Feng et al.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2020)
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Beixiong Zheng et al.
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Telecommunications
Jae-Mo Kang
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Wenhao Cai et al.
IEEE COMMUNICATIONS LETTERS
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Walid Saad et al.
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Shicong Liu et al.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
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Yitao Han et al.
IEEE WIRELESS COMMUNICATIONS LETTERS
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Jian Dang et al.
China Communications
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Jiezhi Zhang et al.
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Victoria Dala Pegorara Souto et al.
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Shaoqing Zhou et al.
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Ahmet M. Elbir et al.
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Mohamed A. ElMossallamy et al.
IEEE TRANSACTIONS ON COGNITIVE COMMUNICATIONS AND NETWORKING
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IEEE COMMUNICATIONS MAGAZINE
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IEEE VEHICULAR TECHNOLOGY MAGAZINE
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Xingbo Lu et al.
IEEE WIRELESS COMMUNICATIONS LETTERS
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2020 IEEE GLOBAL COMMUNICATIONS CONFERENCE (GLOBECOM)
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