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Article
Engineering, Electrical & Electronic
Renwang Li et al.
Summary: This paper considers a reconfigurable intelligent surface (RIS)-aided millimeter wave downlink communication system and formulates a power minimization problem by jointly optimizing hybrid beamforming and response matrix. Two methods are proposed to solve the problem, and the relationship between power minimization and max-min fairness is discussed.
IEEE TRANSACTIONS ON COMMUNICATIONS
(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
Chenghao Feng et al.
Summary: This article proposes an RIS-assisted mmWave point-to-point communication system based on dynamically configured subarray connected hybrid beamforming structures. The joint design of the base station and RIS beamforming matrices is achieved using an energy-efficient analog beamformer and a successive interference cancelation-based method. The proposed dynamic subconnected structure and joint beamforming method strike an attractive tradeoff between bandwidth efficiency and power consumption.
IEEE INTERNET OF THINGS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Long Jiao et al.
Summary: In this paper, a handover scheme using deep reinforcement learning and reconfigurable intelligent surface (RIS) is proposed to mitigate the switching problem and improve the spectrum efficiency in 5G mobile networks.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Phuong T. Tran et al.
Summary: This paper analyzes the performance of a wireless system that utilizes multiple reconfigurable intelligent surfaces (RISs) and a direct link between the source node and the mobile user, taking into consideration transceiver hardware impairments (HIs). The outage probability, throughput, achievable data rate, and symbol error probability of the system with and without HIs are derived and compared to a point-to-point link system. Monte-Carlo simulations are used to verify the derived formulas. The results show that the system with HIs outperforms the point-to-point system at low transmit power, while the system without HIs always performs better than the point-to-point system. HIs have a more severe effect at higher data transmission rates or high modulation orders.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2022)
Article
Computer Science, Information Systems
Wangyang Xu et al.
Summary: This letter proposes a novel deep reinforcement learning algorithm based on a location-aware imitation environment for joint beamforming design in an RIS-aided mmWave multiple-input multiple-output system. By simulating the transmission environment and interacting with it using location information, the algorithm achieves more robust performance without excessive interaction overhead.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Khoi Khac Nguyen et al.
Summary: A simultaneous wireless power transfer and information transmission scheme is proposed for IoT devices, with support from reconfigurable intelligent surface (RIS)-aided unmanned aerial vehicle (UAV) communications. The optimization of UAV trajectory, power allocation, energy harvesting scheduling of IoT devices, and phase-shift matrix of RIS aims at maximizing total network sum-rate. The proposed techniques demonstrate significant improvement in processing time and throughput performance, making them well applicable for practical IoT applications.
IEEE JOURNAL OF SELECTED TOPICS IN SIGNAL PROCESSING
(2022)
Article
Engineering, Electrical & Electronic
Dinh Thi Tam et al.
Summary: This paper proposes a wireless system that combines multiple advanced reconfigurable intelligent surfaces (RISs) with a traditional relay to significantly enhance system performance. The study takes into consideration the imperfect transceiver hardware (ITH) and derives mathematical expressions for outage probability (OP) and throughput. Monte-Carlo simulations confirm the accuracy of the derived formulas. The paper also analyzes the impact of factors such as ITH, carrier frequency, position of RISs and relay, threshold, transmission rate, and the number of reflecting elements on system performance.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Gui Zhou et al.
Summary: This article proposes a novel cascaded channel estimation strategy with low pilot overhead for RIS-aided multiuser multiple-input single-output wireless communication systems. The method exploits the sparsity and correlation of multiuser cascaded channels in millimeter-wave MISO systems to address the channel estimation challenge. The proposed strategy estimates the full channel state information in the first coherence block and re-estimates the channel gains in the remaining blocks with lower pilot overhead. Simulation results demonstrate that the proposed method outperforms existing methods in terms of estimation accuracy with the same pilot overhead.
IEEE TRANSACTIONS ON SIGNAL PROCESSING
(2022)
Article
Computer Science, Information Systems
Bomin Mao et al.
Summary: Green communications are crucial for reducing energy overhead and fossil fuel usage in the information industry. With the advent of 5G and future 6G eras, the demand for green communications becomes even more urgent. Artificial Intelligence (AI) is recognized as the only solution to meet the stringent requirements of 6G while improving energy efficiency and network management. This paper provides an overview of AI-based green communications and discusses the potential research issues for AI models in the green 6G era.
IEEE COMMUNICATIONS SURVEYS AND TUTORIALS
(2022)
Article
Engineering, Electrical & Electronic
Mahyar Nemati et al.
Summary: Investigated the feasibility of utilizing reconfigurable intelligent surfaces (RISs) for outdoor-to-indoor (O2I) communication in mmWave networks, proposing a new notion of prefabricated RIS-empowered wall. Conducted performance analysis, deriving two closed-form approximations for the downlink signal-to-noise ratio (SNR) coverage probability, and performed extensive simulations to evaluate accuracy.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Yue Xiu et al.
Summary: This paper analyzes a reconfigurable intelligent surface (RIS)-aided millimeter wave (mmWave) non-orthogonal multiple access (NOMA) system and proposes an AO algorithm to solve the problem of maximizing total rate. The results show that the proposed algorithm outperforms existing schemes in terms of total rate and is capable of improving the total rate of traditional systems.
IEEE TRANSACTIONS ON WIRELESS 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
Engineering, Electrical & Electronic
Jiguang He et al.
Summary: The paper proposes a two-stage channel estimation scheme for RIS-aided millimeter wave MIMO systems, achieving super-resolution channel parameter estimation and demonstrating promising performance in the subsequent data transmission phase.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2021)
Article
Computer Science, Information Systems
Yushan Liu et al.
Summary: This study proposes a cascaded channel estimation framework for RIS-assisted mmWave communications, taking into account the wideband effect and using the Newtonized orthogonal matching pursuit algorithm for channel parameter detection. The Cramer-Rao lower bound is introduced to evaluate the channel estimation performance. Numerical results demonstrate the effectiveness of the proposed channel estimation scheme.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Hazem Ibrahim et al.
Summary: Intelligent Reflecting Surfaces (IRS) are proposed as a solution to enhance wireless network coverage by adjusting passive elements, creating a favorable propagation environment. This article introduces a framework based on moment generation functions (MGF) to characterize the coverage probability of users in IRS-aided wireless systems with generic fading channels and direct links, showing tractability for varying metasurface values. Additionally, channel hardening factors and maximum coverage ranges are derived, with analytical results validated through Monte-Carlo simulations.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(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
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
Computer Science, Information Systems
Emil Bjornson et al.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2020)
Article
Engineering, Electrical & Electronic
Lipeng Zhu et al.
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
(2020)
Article
Engineering, Electrical & Electronic
Saman Atapattu et al.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2020)
Article
Computer Science, Information Systems
Mahyar Nemati et al.
Article
Computer Science, Hardware & Architecture
Lu Wang et al.
IEEE WIRELESS COMMUNICATIONS
(2019)
Article
Computer Science, Hardware & Architecture
Ping Yang et al.
Article
Computer Science, Information Systems
Lipeng Zhu et al.
Article
Computer Science, Information Systems
Ertugrul Basar et al.
Article
Engineering, Electrical & Electronic
Cheng Li et al.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2017)
Article
Engineering, Electrical & Electronic
Tran Trung Duy et al.
IET COMMUNICATIONS
(2016)
Article
Materials Science, Multidisciplinary
V. S. Asadchy et al.
Article
Telecommunications
Daniel Benevides da Costa et al.
IEEE COMMUNICATIONS LETTERS
(2011)
