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Author: Haseeb Ur Rehman
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Intelligent reflective surfaces (IRSs) have recently emerged as a promising technology for 6G wireless communications as it can improve both the spectral and energy efficiencies of wireless systems at a low cost. In this thesis, we first tackle the problem of joint active and passive beamforming optimization for an intelligent reflective surface (IRS)-assisted multi-user downlink multiple-input multiple-output (MIMO) communication system under both ideal and practical IRS phase shifts. We aim to maximize the spectral efficiency of the users by minimizing the sum mean square error (MSE) of the users' received symbols. For this, a joint non-convex optimization problem is formulated under the sum minimum mean square error (MMSE) criterion. An alternating optimization and vector approximate message passing (VAMP)-based approach is presented to solve the joint problem under both ideal and practical constraints on the IRS phase shifts. Then, we introduce a novel approach of utilizing the IRS, now called modulating intelligent surface (MIS), for joint data modulation and signal beamforming in a multi-user downlink cellular network by leveraging the idea of backscatter communication. We present a general framework in which the MIS is used $i)$ to beamform the signals for a set of users whose data is modulated by the BS, and at the same time $ii)$ to embed the data of a different set of users by passively modulating the deliberately sent signals from the BS. By following the same VAMP-based optimization approach developed earlier, we optimize $i)$ the MIS phase-shifts for passive beamforming and data embedding for the BS- and MIS-served users, respectively, $ii)$ the active precoder and the receive scaling factors for the BS- and MIS-served users, respectively. Simulation results are presented to illustrate the performance of both the proposed IRS-based and MIS-based schemes under both perfect and imperfect channel state information (CSI). The results validate the superiority of the proposed method over the state-of-the-art techniques both in terms of throughput and computational complexity. The results also reveal that the proposed MIS-based approach outperforms the existing IRS-based schemes in terms of throughput while supporting a much higher number of users.
Author: Haseeb Ur Rehman
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Intelligent reflective surfaces (IRSs) have recently emerged as a promising technology for 6G wireless communications as it can improve both the spectral and energy efficiencies of wireless systems at a low cost. In this thesis, we first tackle the problem of joint active and passive beamforming optimization for an intelligent reflective surface (IRS)-assisted multi-user downlink multiple-input multiple-output (MIMO) communication system under both ideal and practical IRS phase shifts. We aim to maximize the spectral efficiency of the users by minimizing the sum mean square error (MSE) of the users' received symbols. For this, a joint non-convex optimization problem is formulated under the sum minimum mean square error (MMSE) criterion. An alternating optimization and vector approximate message passing (VAMP)-based approach is presented to solve the joint problem under both ideal and practical constraints on the IRS phase shifts. Then, we introduce a novel approach of utilizing the IRS, now called modulating intelligent surface (MIS), for joint data modulation and signal beamforming in a multi-user downlink cellular network by leveraging the idea of backscatter communication. We present a general framework in which the MIS is used $i)$ to beamform the signals for a set of users whose data is modulated by the BS, and at the same time $ii)$ to embed the data of a different set of users by passively modulating the deliberately sent signals from the BS. By following the same VAMP-based optimization approach developed earlier, we optimize $i)$ the MIS phase-shifts for passive beamforming and data embedding for the BS- and MIS-served users, respectively, $ii)$ the active precoder and the receive scaling factors for the BS- and MIS-served users, respectively. Simulation results are presented to illustrate the performance of both the proposed IRS-based and MIS-based schemes under both perfect and imperfect channel state information (CSI). The results validate the superiority of the proposed method over the state-of-the-art techniques both in terms of throughput and computational complexity. The results also reveal that the proposed MIS-based approach outperforms the existing IRS-based schemes in terms of throughput while supporting a much higher number of users.
Author: Alice Faisal
Publisher: Springer Nature
ISBN: 303152554X
Category :
Languages : en
Pages : 64
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Book Description
Author: Hongliang Zhang
Publisher: Springer Nature
ISBN: 3030734994
Category : Computers
Languages : en
Pages : 260
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Book Description
This book presents novel RIS-Based Smart Radio techniques, targeting at achieving high-quality channel links in cellular communications via design and optimization of the RIS construction. Unlike traditional antenna arrays, three unique characteristics of the RIS will be revealed in this book. First, the built-in programmable configuration of the RIS enables analog beamforming inherently without extra hardware or signal processing. Second, the incident signals can be controlled to partly reflect and partly transmit through the RIS simultaneously, adding more flexibility to signal transmission. Third, the RIS has no digital processing capability to actively send signals nor any radio frequency (RF) components. As such, it is necessary to develop novel channel estimation and communication protocols, design joint digital and RIS-based analog beamforming schemes and perform interference control via mixed reflection and transmission. This book also investigates how to integrate the RIS to legacy communication systems. RIS techniques are further investigated in this book (benefited from its ability to actively shape the propagation environment) to achieve two types of wireless applications, i.e., RF sensing and localization. The influence of the sensing objectives on the wireless signal propagation can be potentially recognized by the receivers, which are then utilized to identify the objectives in RF sensing. Unlike traditional sensing techniques, RIS-aided sensing can actively customize the wireless channels and generate a favorable massive number of independent paths interacting with the sensing objectives. It is desirable to design RIS-based sensing algorithms, and optimize RIS configurations. For the second application, i.e., RIS aided localization, an RIS is deployed between the access point (AP) and users. The AP can then analyze reflected signals from users via different RIS configurations to obtain accurate locations of users. However, this is a challenging task due to the dynamic user topology, as well as the mutual influence between multiple users and the RIS. Therefore, the operations of the RIS, the AP, and multiple users need to be carefully coordinated. A new RIS-based localization protocol for device cooperation and an RIS configuration optimization algorithm are also required. This book targets researchers and graduate-level students focusing on communications and networks. Signal processing engineers, computer and information scientists, applied mathematicians and statisticians, who work in RIS research and development will also find this book useful.
Author: Khoa N. Le
Publisher: Springer Nature
ISBN: 3030553663
Category : Technology & Engineering
Languages : en
Pages : 213
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Book Description
This book studies the vulnerability of wireless communications under line-of-sight (LoS) and non-LoS correlated fading environments. The authors theoretically and practically provide physical layer security analyses for several technologies and networks such as Fifth-Generation (5G) networks, Internet of Things (IoT) applications, and Non-orthogonal multiple access (NOMA). The authors have provided these under various practical scenarios, and developed theoretical aspects to validate their proposed applications. Presents physical layer security (PLS) under correlated fading environments, 5G wireless networks, and NOMA networks; Provides end-to-end analyses, combination of channel correlation and outdated CSI and their effects on PL; Includes contributions of PLS research written by global experts in academia and industry.
Author: Mojtaba Vaezi
Publisher: Springer
ISBN: 3319920901
Category : Technology & Engineering
Languages : en
Pages : 685
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Book Description
This book presents comprehensive coverage of current and emerging multiple access, random access, and waveform design techniques for 5G wireless networks and beyond. A definitive reference for researchers in these fields, the book describes recent research from academia, industry, and standardization bodies. The book is an all-encompassing treatment of these areas addressing orthogonal multiple access and waveform design, non-orthogonal multiple access (NOMA) via power, code, and other domains, and orthogonal, non-orthogonal, and grant-free random access. The book builds its foundations on state of the art research papers, measurements, and experimental results from a variety of sources.
Author: Fan Yang
Publisher: Cambridge University Press
ISBN: 1108654207
Category : Science
Languages : en
Pages : 489
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Book Description
Written by the leading experts in the field, this text provides systematic coverage of the theory, physics, functional designs, and engineering applications of advanced engineered electromagnetic surfaces. All the essential topics are included, from the fundamental theorems of surface electromagnetics, to analytical models, general sheet transmission conditions (GSTC), metasurface synthesis, and quasi-periodic analysis. A plethora of examples throughout illustrate the practical applications of surface electromagnetics, including gap waveguides, modulated metasurface antennas, transmit arrays, microwave imaging, cloaking, and orbital angular momentum (OAM ) beam generation, allowing readers to develop their own surface electromagnetics-based devices and systems. Enabling a fully comprehensive understanding of surface electromagnetics, this is an invaluable text for researchers, practising engineers and students working in electromagnetics antennas, metasurfaces and optics.
Author: IEEE Staff
Publisher:
ISBN: 9781728194424
Category :
Languages : en
Pages :
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Book Description
IEEE ICC is one of the two flagship IEEE conferences in the field of communications Montreal is to host this conference in 2021 Each annual IEEE ICC conference typically attracts approximately 1,500 2,000 attendees, and will present over 1,000 research works over its duration As well as being an opportunity to share pioneering research ideas and developments, the conference is also an excellent networking and publicity event, giving the opportunity for businesses and clients to link together, and presenting the scope for companies to publicize themselves and their products among the leaders of communications industries from all over the world
Author: Qingqing Wu
Publisher: John Wiley & Sons
ISBN: 1119913098
Category : Technology & Engineering
Languages : en
Pages : 372
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Book Description
INTELLIGENT SURFACES EMPOWERED 6G WIRELESS NETWORK Integrate intelligent surfaces into the wireless networks of the future. The next generation of wireless technology (6G) promises to transform wireless communication and human interconnectivity like never before. Intelligent surface, which adopts significant numbers of small reflective surfaces to reconfigure wireless connections and improve network performance, has recently been recognized as a critical component for enabling future 6G. The next phase of wireless technology demands engineers and researchers are familiar with this technology and are able to cope with the challenges. Intelligent Surfaces Empowered 6G Wireless Network provides a thorough overview of intelligent surface technologies and their applications in wireless networks and 6G. It includes an introduction to the fundamentals of intelligent surfaces, before moving to more advanced content for engineers who understand them and look to apply them in the 6G realm. Its detailed discussion of the challenges and opportunities posed by intelligent surfaces empowered wireless networks makes it the first work of its kind. Intelligent Surfaces Empowered 6G Wireless Network readers will also find: An editorial team including the original pioneers of intelligent surface technology. Detailed coverage of subjects including MIMO, terahertz, NOMA, energy harvesting, physical layer security, computing, sensing, machine learning, and more. Discussion of hardware design, signal processing techniques, and other critical aspects of IRS engineering. Intelligent Surfaces Empowered 6G Wireless Network is a must for students, researchers, and working engineers looking to understand this vital aspect of the coming 6G revolution.
Author: Huilong Jin
Publisher: Springer Nature
ISBN: 3030980022
Category : Computers
Languages : en
Pages : 369
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Book Description
This book constitutes the refereed post-conference proceedings of the 16th International Conference on Cognitive Radio Oriented Wireless Networks, CROWNCOM 2021, held in December 2021, and the 14th International Conference on Wireless Internet, WiCON 2021, held in November 2021. Due to COVID-19 pandemic the conferences were held virtually. The 18 full papers of CROWNCOM 2021 were selected from 40 submissions and present new research results and perspectives of cognitive radio systems for 5G and beyond 5G networks, big data technologies, such as storage, search and management. WiCON 2021 presents 7 papers covering topics ranging from technology issues to new applications and test-bed developments, especially focusing on next-generation wireless Internet, 5G, 6G, IoT, Industrial IoT, Healthcare IoT, and related methodologies.
Author: Derrick Wing Kwan Ng
Publisher: John Wiley & Sons
ISBN: 1119476798
Category : Technology & Engineering
Languages : en
Pages : 318
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Book Description
em style="mso-bidi-font-style: normal;"Wireless Information and Power Transfer offers an authoritative and comprehensive guide to the theory, models, techniques, implementation and application of wireless information and power transfer (WIPT) in energy-constrained wireless communication networks. With contributions from an international panel of experts, this important resource covers the various aspects of WIPT systems such as, system modeling, physical layer techniques, resource allocation and performance analysis. The contributors also explore targeted research problems typically encountered when designing WIPT systems.