Related references
Note: Only part of the references are listed.
Article
Engineering, Electrical & Electronic
Yongjun Xu et al.
Summary: This paper proposes deploying reconfigurable intelligent surfaces (RISs) to improve the energy efficiency (EE) of femtocells in heterogeneous networks (HetNets). Due to the passive characteristics of RISs and non-cooperative relationship between different tiers, perfect channel state information is difficult to obtain. A realistic robust beamforming design is investigated to maximize the minimum EE of the femtocell under channel uncertainties and residual hardware impairments (HWIs). Simulation results show that the proposed algorithm outperforms existing algorithms in terms of fairness, EE, and outage probability.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Zhengyu Zhu et al.
Summary: This paper proposes a new transmission policy for intelligent reflecting surface (IRS) empowered wireless powered internet of things systems. By optimizing the phase shifts of the IRS, the transfer time scheduling, and the power splitting ratio, the sum throughput is maximized. The problem is divided into two sub-problems and solved using an alternating optimization algorithm, with consideration of a special case where the circuit power consumption of IoT devices can be neglected.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2022)
Article
Telecommunications
Yuze Zou et al.
Summary: This paper investigates the energy harvesting and optimization problem in an intelligent reflecting surface assisted MISO system. A two-stage optimization framework is proposed to jointly optimize the transmit power, beamforming, and reflection amplitude. The study reveals that increasing the size of the IRS does not always lead to improved information transmission performance in the presence of uncertain channel information.
IEEE TRANSACTIONS ON COGNITIVE COMMUNICATIONS AND NETWORKING
(2022)
Article
Engineering, Electrical & Electronic
Li Wei et al.
Summary: In this paper, a channel modeling challenge in the downlink of multi-user MIMO communications is addressed. An EM-compliant channel model is extended to the multi-user case, and the spectral efficiency of maximum-ratio transmission and Zero-Forcing precoding schemes is investigated. A novel hardware efficient ZF precoder is introduced, leveraging Neumann series expansion.
IEEE JOURNAL OF SELECTED TOPICS IN SIGNAL PROCESSING
(2022)
Article
Engineering, Electrical & Electronic
Bin Lyu et al.
Summary: This paper proposes a hybrid-relaying scheme with an IRS to optimize both downlink energy transfer and uplink information transmission in a WPCN. By using TS and PS schemes, the IRS's phase shifts and network resource allocation are jointly optimized to maximize the sum-rate. Through numerical results, significant system sum-rate gain is demonstrated compared to the baseline scheme without IRS.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Alessio Zappone et al.
Summary: Reconfigurable intelligent surfaces have emerged as a promising technology for future wireless networks, but a major challenge is the overhead required for channel state information estimation and optimized phase shift reporting. This study introduces an overhead-aware resource allocation framework for wireless networks using reconfigurable intelligent surfaces, optimizing system rate and energy efficiency with respect to various parameters while investigating the trade-off between optimized radio resource allocation policies and related overhead.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2021)
Article
Telecommunications
Yongjun Xu et al.
Summary: This work focuses on the importance of secure and fair transmission in wireless-powered backscatter communication networks (WPBCNs) and proposes an energy efficiency (EE)-based resource allocation problem to optimize backscattering time, power ratio of artificial noise (AN), and reflection coefficient of tags to enhance security. The proposed Dinkelbach-based iterative algorithm effectively tackles the non-convexity of the problem and simulation results demonstrate the algorithm's effectiveness.
IEEE COMMUNICATIONS LETTERS
(2021)
Article
Telecommunications
Zhengnian Gao et al.
Summary: The study focuses on robust resource allocation for RIS-assisted wireless-powered communication networks, optimizing parameters to maximize the total energy efficiency of WPUs. Simulation results confirm the effectiveness of the proposed algorithm.
IEEE COMMUNICATIONS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Xinyue Xu et al.
Summary: This paper investigates a symbiotic radio system empowered by a reconfigurable intelligent surface (RIS) over a broadcasting system, optimizing the active precoding of the base station (BS) and passive beamforming of the RIS to minimize the BS's transmit power. Two algorithms are proposed to address the high computational complexity issue caused by the semi-definite relaxation (SDR) technique. The simulation results demonstrate the superior performance of the proposed system compared to traditional broadcasting systems without RIS, with the alternative algorithm achieving similar transmit power performance as the SDR-based algorithm but with significantly reduced computational complexity.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2021)
Article
Computer Science, Information Systems
Xingquan Li et al.
Summary: This article introduces the integration of intelligent reflecting surfaces (IRS) into wireless-powered communication networks (WPCNs) to optimize the transmission efficiency of IoT devices. By using the block coordinate descent method to decouple the optimization problem into three subproblems, simulation results demonstrate that the performance of integrating IRS and WPCNs outperforms traditional WPCNs. Additionally, the results show that IRS is an effective method to preserve the tradeoff of energy efficiency and transmission efficiency in the IoT.
IEEE INTERNET OF THINGS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Gilderlan T. de Araujo et al.
Summary: This paper explores the receiver design for an IRS-assisted MIMO communication system using a tensor modeling approach to solve the channel estimation problem. Two channel estimation methods are presented, both of which rely on decoupling of the channel matrices to enhance performance.
IEEE JOURNAL OF SELECTED TOPICS IN SIGNAL PROCESSING
(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
Engineering, Electrical & Electronic
Li Wei et al.
Summary: Reconfigurable Intelligent Surfaces (RISs) are considered as an energy-efficient solution for future wireless networks due to their potential in enabling massive connectivity and low-latency communications. In this paper, a channel estimation framework based on parallel factor decomposition is proposed for the uplink of a RIS-empowered multi-user MISO communication systems. Two iterative estimation algorithms are presented and shown to outperform benchmark schemes in simulation results.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Yongjun Xu et al.
Summary: This paper proposes a joint optimization scheme for RIS-assisted wireless-powered communication networks, leading to improved energy efficiency compared to conventional schemes.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Zheng Chu et al.
Summary: This paper proposes a novel transmission policy for a wireless powered sensor network assisted by an intelligent reflecting surface to enhance the performance of wireless energy transfer and wireless information transfer with certain phase shifts. The proposed policy is capable of scheduling transmission time slots by switching between energy collection and energy reflection modes, aiming to maximize system sum throughput. Numerical results demonstrate the effectiveness of the proposed policy and validate the beneficial role of the intelligent reflecting surface compared to benchmark schemes.
IEEE JOURNAL OF SELECTED TOPICS IN SIGNAL PROCESSING
(2021)
Article
Engineering, Electrical & Electronic
Qingqing Wu et al.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2020)
Article
Computer Science, Information Systems
Qingqing Wu et al.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2020)
Article
Engineering, Electrical & Electronic
Cunhua Pan et al.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2020)
Article
Computer Science, Information Systems
Yifei Yang et al.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2020)
Article
Engineering, Electrical & Electronic
Cunhua Pan et al.
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
(2020)
Article
Engineering, Electrical & Electronic
Qingqing Wu et al.
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
(2020)
Article
Engineering, Electrical & Electronic
Yuze Zou et al.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2020)
Article
Engineering, Electrical & Electronic
Emil Bjornson et al.
IEEE COMMUNICATIONS MAGAZINE
(2020)
Article
Engineering, Electrical & Electronic
Marco Di Renzo et al.
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
(2020)
Article
Engineering, Electrical & Electronic
Gui Zhou et al.
IEEE TRANSACTIONS ON SIGNAL PROCESSING
(2020)
Article
Mathematics, Applied
Yu Wang et al.
JOURNAL OF SCIENTIFIC COMPUTING
(2019)
Article
Engineering, Electrical & Electronic
Qingqing Wu et al.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2019)
Article
Engineering, Electrical & Electronic
Shuai Wang et al.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2017)
Article
Engineering, Electrical & Electronic
Shixin Luo et al.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2015)
Article
Engineering, Electrical & Electronic
Kaiming Shen et al.
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
(2014)
Article
Engineering, Electrical & Electronic
Nicholas D. Sidiropoulos et al.
IEEE TRANSACTIONS ON SIGNAL PROCESSING
(2006)
Article
Computer Science, Hardware & Architecture
MX Goemans et al.
JOURNAL OF COMPUTER AND SYSTEM SCIENCES
(2004)