Article
Computer Science, Information Systems
Aravindh Krishnamoorthy, Robert Schober
Summary: In this letter, we propose a novel successively-regularized zero forcing (SRZF) precoding method for downlink massive multi-user multiple-input multiple-output (MIMO) systems. The SRZF precoding exploits successive null spaces of the MIMO channels to control inter-user interference and enhance system performance and robustness to imperfect channel state information (CSI). Simulation results show that the proposed SRZF precoding outperforms baseline schemes for both perfect and imperfect CSI in massive MIMO systems with inter-user channel correlations.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Ke-Xin Li, Li You, Jiaheng Wang, Xiqi Gao, Christos G. Tsinos, Symeon Chatzinotas, Bjorn Ottersten
Summary: This paper investigates the downlink transmit design for low-earth-orbit satellite communication systems using the slow-varying statistical channel state information. An efficient algorithm is devised to compute the optimal precoding vectors, and a low-complexity learning framework is proposed for optimizing the scalar variables.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Weimin Du, Zujun Liu
Summary: This paper proposes a dominant path zero-forcing precoding scheme based on the spatial correlation of FD massive MIMO channels, achieving a better performance-complexity tradeoff with lower complexity.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Mohammed Almoneer, Patrick Mitran, Slim Boumaiza
Summary: In this study, the impact of two variants of zeroforcing (ZF) precoding on massive MIMO transmitters was investigated. The minimax variant was found to reduce variations in average-power levels across RF chains compared to the conventional ZF precoder, resulting in improved transmitter performance.
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2021)
Article
Telecommunications
Mohamed Mostafa, Fatma Newagy, Ismail Hafez
Summary: In this paper, an energy efficient precoding scheme is proposed for massive MIMO systems by introducing a complex valued regularization parameter to improve energy efficiency, outperforming the conventional ZF precoder in terms of power consumption and achievable transmission rate. The proposed complex regularized zero forcing precoder is analytically evaluated, verified through simulations, and shown to be robust in massive MIMO systems.
WIRELESS PERSONAL COMMUNICATIONS
(2021)
Article
Computer Science, Information Systems
Xiaofeng Su, Yi Jiang
Summary: This study examines zero-forcing (ZF) hybrid precoding to maximize the sum-rate of a downlink multi-user massive multi-input multi-output (mMIMO) system. The optimization of both digital and analog precoder is conducted to achieve the optimal hybrid precoder which outperforms existing methods without approximating the objective function of sum-rate.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Kai Wu, J. Andrew Zhang, Xiaojing Huang, Y. Jay Guo, Lajos Hanzo
Summary: This paper proposes a low-complexity solution for the user and beam selection problem in beamspace millimeter-wave (mmWave) and terahertz (THz) massive MIMO. Unlike previous approaches, dirty paper coding (DPC) is introduced to address this problem. The properties of DPC sum rate in beamspace massive MIMO are revealed, showing its monotonic evolution with the number of users and beams selected. A set of algorithms with unique trade-offs is developed to simplify the joint user and beam selection problem, enabling simultaneous user and beam selection based on partial beamspace channels. The simulation results validate the effectiveness of the proposed design and analysis, demonstrating its superiority over prior solutions.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2023)
Article
Computer Science, Information Systems
Idowu Ajayi, Yahia Medjahdi, Rafik Zayani, Lina Mroueh, Fatima Zohra Kaddour
Summary: This paper introduces a new approach to providing secure physical-layer massive MIMO communication by synthesizing orthogonal artificial noise to improve energy efficiency and reduce the PAPR of transmit signal. The proposed PAPR-aware precoding scheme enhances the secrecy performance of massive MIMO while ensuring excellent transmission quality for legitimate users.
Article
Computer Science, Information Systems
Yiru Liu, Bo Ai, Jiayi Zhang
Summary: This paper investigates the mutual coupling effect and its impact on system performance in massive MIMO systems. By employing suitable downlink precoding algorithms, base stations with a large number of antennas can serve multiple users and cells simultaneously. The paper also proposes a method to assess the mutual coupling effect and validates its effectiveness through simulation results.
Article
Engineering, Electrical & Electronic
Thomas Ketseoglou, Matthew C. Valenti, Ender Ayanoglu
Summary: The study focuses on analyzing and defining high-efficiency precoding groups in dense millimeter-wavelength cells, using multi-carrier analysis to model inter-group interference, achieving balanced throughput among different groups.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Rade P. P. Dabetic, Goran B. B. Markovic
Summary: Multiuser multiple input multiple output (MU-MIMO) systems provide high spectral efficiency (SE) through transmit/receive combining schemes. Regularized zero forcing (RZF) and Tomlinson-Harashima precoding (THP) are commonly used combining schemes for downlink (DL). However, in massive MU-MIMO systems, the computational complexity of RZF and THP schemes is high. The authors propose a low-complexity transmit combining scheme based on gram-Schmidt orthogonalization for massive MU-MIMO systems with time division duplex (TDD), which achieves slightly better SE than THP but with much lower complexity than THP and RZF schemes.
ELECTRONICS LETTERS
(2023)
Article
Automation & Control Systems
Byung Moo Lee
Summary: This article presents high energy-efficiency operation schemes for downlink OFDM-based massive MIMO systems in IIoT networks, focusing on systematic operation methods to meet required EE metrics with low latency and including important downlink operation parameters and PAPR reduction techniques. Simulation results validate the effectiveness of the proposed schemes.
IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS
(2021)
Article
Engineering, Electrical & Electronic
Amin Ghazanfari, Trinh Van Chien, Emil Bjornson, Erik G. Larsson
Summary: This study investigates the downlink channel estimation in a multi-cell Massive MIMO system and proposes two novel estimation methods that can be applied without downlink pilots. The performance of the proposed methods is compared with the state-of-the-art using normalized mean-squared error and spectral efficiency (SE).
IEEE TRANSACTIONS ON COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Lei Hua, Yajun Wang, Zhuxian Lian, Yinjie Su, Zhibin Xie
Summary: This paper addresses the reduction of peak to average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM)-based massive multi-user (MU) multiple-input multiple-output (MIMO) downlink systems. By utilizing the redundancy provided by a large number of base station antennas, the non-convex optimization problem of OFDM modulation, MU precoding, and PAPR reduction is formulated. The linearized alternating direction method of multipliers (LADMM) is used to directly solve this problem without relaxation. Experimental results show that LADMM achieves comparable PAPR reduction, faster convergence, and lower complexity compared to existing methods based on relaxations.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Nan Qu, Bingbing Li, Rubayet Shafin, Mingqian Liu, Fengkui Gong, Lingjia Liu
Summary: The next-generation cellular system operating in millimeter-wave frequencies requires different signal processing schemes, such as beam management and user scheduling, to improve system performance. This novel angle-based downlink precoding strategy shows superiority over conventional techniques.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2022)
Article
Telecommunications
Ali Israr, Adil Israr, Faizullah Khan, Faisal Khan
WIRELESS PERSONAL COMMUNICATIONS
(2019)
Review
Computer Science, Hardware & Architecture
Adil Israr, Qiang Yang, Wei Li, Albert Y. Zomaya
Summary: The article discusses the importance of renewable energy in the design of 5G mobile networks, highlighting the significance of utilizing renewable energy management techniques to reduce energy consumption, costs, and carbon dioxide emissions. It also emphasizes the development challenges and future prospects of renewable energy powered base stations in sustainable 5G network infrastructure.
JOURNAL OF NETWORK AND COMPUTER APPLICATIONS
(2021)
Article
Computer Science, Information Systems
Adil Israr, Qiang Yang, Ali Israr
Summary: This paper investigates the energy consumption and power efficiency of 5G mobile network architectures, considering factors such as traffic load, antenna quantity, bandwidth, and low power node density. The multiband 2-tier heterogeneous network, cloud radio access network, and heterogeneous cloud radio access network are analyzed, and power consumption analytical models are developed. The study identifies energy-efficient architectures and finds that the increase in power consumption of radio frequency components and computation power contributes to the overall increase in energy consumption.
PERVASIVE AND MOBILE COMPUTING
(2022)
Proceedings Paper
Automation & Control Systems
Weiming Zheng, Ke Sun, Xiaodi Zhang, Quanming Zhang, Adil Israr, Qiang Yang
PROCEEDINGS OF THE 32ND 2020 CHINESE CONTROL AND DECISION CONFERENCE (CCDC 2020)
(2020)
Proceedings Paper
Engineering, Marine
Rabia Qadar, Mumraiz K. Kasi, Adil Israr, Faisal A. Kakar, Afroza Batool, Danish Noor, Javed A. Pervaiz, Abraham R. Henry
OCEANS 2016 - SHANGHAI
(2016)
Proceedings Paper
Computer Science, Hardware & Architecture
Ali Israr, Muhammad Junaid, Adil Israr
2015 13TH INTERNATIONAL CONFERENCE ON FRONTIERS OF INFORMATION TECHNOLOGY (FIT)
(2015)
