Hybrid Massive Mimo Precoding In Cloud Ran
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Hybrid Massive Mimo Precoding In Cloud Ran
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Author : Tho Le-Ngoc
language : en
Publisher: Springer
Release Date : 2018-11-28
Hybrid Massive Mimo Precoding In Cloud Ran written by Tho Le-Ngoc and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-11-28 with Technology & Engineering categories.
This book covers the design and optimization of hybrid RF-baseband precoding for massive multiple-input multiple-output (MIMO)-enabled cloud radio access networks (RANs), where use cases such as millimeter-wave wireless backhauling, fully-loaded cellular networks are of interest. The suitability and practical implementation of the proposed precoding solutions for the Cloud RAN architecture are also discussed. Novel techniques are examined for RF precoding optimization in combination with nonlinear precoding at baseband, and the superiority of joint RF-baseband design is verified. Moreover, the efficacy of hybrid RF-baseband precoding to combat intercell interference in a multi-cell environment with universal frequency reuse is investigated, which is concluded to be a promising enabler for the dense deployment of base stations. This book mainly targets researchers and engineers interested in the challenges, optimization, and implementation of massive MIMO precoding in 5G Cloud RAN. Graduate students in electrical engineering and computer science interested in the application of mathematical optimization to model and solve precoding problems in massive MIMO cellular systems will also be interested in this book.
Hybrid Massive Mimo Precoding In Cloud Ran
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Author : Tho Le-Ngoc
language : en
Publisher:
Release Date : 2019
Hybrid Massive Mimo Precoding In Cloud Ran written by Tho Le-Ngoc and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Hybrid Rf Baseband Precoding Combining For Massive Mimo Wireless Communications
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Author : Ruikai Mai
language : en
Publisher:
Release Date : 2018
Hybrid Rf Baseband Precoding Combining For Massive Mimo Wireless Communications written by Ruikai Mai and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
"Massive multiple-input multiple-output (MIMO), which scales up the number of antennas to the order of tens or even hundreds, promises dramatically improved spectral efficiency and link reliability beyond what can be possibly achieved by conventional MIMO. Recently, in an effort to overcome technical issues such as hardware complexity and power consumption confronted by the conventional fully digital implementation in the large-scale antenna regime, a hybrid RF-baseband precoding/combining architecture has been proposed. By limiting the number of RF chains, a stage of RF analog precoding/combining is introduced in combination with baseband digital precoding/combining. In this research, we propose novel strategies for joint RF-baseband optimization assuming two-timescale channel state information (CSI), which consists of instantaneous effective CSI and statistical CSI. Considering the instantaneous effective CSI-based linear baseband precoding/combining for the point-to-point massive MIMO and nonlinear baseband precoding for the multi-user massive MIMO downlink, RF precoding designs are addressed with respect to the performance metrics of mutual information and mean square error (MSE).We first propose to alleviate the channel estimation overhead in point-to-point massive MIMO backhauling by reducing the high-dimensional channel to a low-dimensional RF beam-space. This is motivated by the observation that the channel power tends to be concentrated in the eigen-domain as a result of limited scattering. Through a joint selection of the constitutive RF transmit and receive beams, the loss of channel power can be decreased, and therefore a near-optimal transmission rate can still be achieved under loose and stringent statistical queueing constraints. When the mechanism of hybrid automatic repeat request (ARQ) is enabled, multiple packet retransmissions are likely to experience independent channel realizations. In addition to the spatial diversity, such time diversity presents another possibility for further performance enhancement in the point-to-point massive MIMO. Building upon the knowledge of the previous failed retransmissions, we sequentially optimize the hybrid precoder and combiner for the current packet retransmission, which leads to improved spectral efficiency over those that are oblivious to the diversity in the time dimension.Without receiver cooperation as in the point-to-point MIMO, linear baseband precoding suffers severe power loss relative to the capacity-achieving dirty-paper coding in a fully loaded homogeneous multi-user environment. This is attributed to the fact that the transmission along the eigen-channel with a vanishingly small channel gain consumes most of the transmit power. By taking advantage of the optimization of the extra degrees of freedom in the form of vector perturbation (VP), the proposed use of minimum MSE (MMSE)-VP in hybrid precoding for single-cell massive MIMO remarkably outperforms the perfect CSI-based fully digital linear counterpart. Moreover, factoring the nonlinear perturbation effect in the RF design delivers a superior error performance to the existing solutions that fail to do so. We then explore coordinated nonlinear hybrid precoding between base stations as a spectrally efficient means to realize single-cell processing with universal frequency reuse. In view of the infeasibility to achieve ICI mitigation between cell-edge users through the spatial correlation-based RF precoding, we resort to the tracking of the high-dimensional CSI, as generated by leveraging the effective CSI together with the channel statistics. Specifically, based on such CSI estimates, the proposed RF block diagonalization effectively limits the adverse impact of ICI, and thus creates multiple single-cell environments in the RF beam domain. The low-dimensional RF beam domain also reduces the exposure of the baseband to the channel estimation errors, and hence lessens the resulting performance degradation." --
Power Allocation In Hybrid Precoding Massive Mimo Systems
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Author : Mahmoud Sallam
language : en
Publisher:
Release Date : 2022
Power Allocation In Hybrid Precoding Massive Mimo Systems written by Mahmoud Sallam and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
"Massive MIMO (mMIMO), using a very large number of antenna elements to effectively serve multiple users (MU) simultaneously, has shown great promise to enhance the system capacity in 5G and beyond. Hybrid beamforming/precoding is one of the most popular mMIMO architectures, aiming to reduce the complexity by using a beamforming stage to bring the very large number of antenna elements to a much smaller number of RF chains, and consequently a small baseband (BB) precoder, sufficient for MU communications. The RF and BB precoders are designed to minimize the interference among users as much as possible.However, when users are too close, it may not be possible to serve them using different beams. This leads to higher interference among users and a significant decrease in capacity, especially when using high transmit power.In this work, we present three approaches for power allocation (PA) in HBF-mMIMO system to maximize the sum-rate of the users based on the effective channel obtained after beamforming/precoding.We start by simplifying the problem with a negligible-interference assumption, which leads to the water-filling (wf) strategy. A parameter called "channel indicator" is proposed accordingly, which can indicate the effects of interference on the channel quality and the success of the WF solution in a given scenario by a single value. By ignoring interference, WF solution tends to allocate more power to users having larger main-channel gains.WF solution is simple and acceptable when interference is low. However, when interference becomes significantly high, WF solution is far from the optimum PA. We continue by introducing a direct-solution (DS) approach for solving the PA optimization problem in presence of interference. The relationship between the channel gains and the sum-rate function is studied in detail, especially for the two-user and three-user cases. We focus on studying the impacts of the direct (main) channel and the levels of interference users caused and received by users on the sum-rate function.A user ranking algorithm based on the channel indicator is proposed, saving time and computational power for the DS.The Lagrangian solution is also derived for the general case as an alternative PA approach, providing a general generating equation. DS tends to reduce power allocated to users causing more interference.DS can offer the optimum PA solution at the costs of high complexity, especially for a large number of users. For this, we consider the iterative water-filling (IWF) as an extension of WF that takes the interference into account.The behavior of the IWF is studied in detail, by investigating the effect of the channel gains and transmit power on its trajectory and convergence. A modified IWF algorithm is proposed based on the user ranking algorithm to improve the performance of the IWF in high interference scenarios.IWF has the tendency to reduce powers allocated to users receiving more interference"--
Hybrid Precoding Algorithms For Millimeter Wave Massive Mimo Systems
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Author : Osama Alluhaibi
language : en
Publisher:
Release Date : 2018
Hybrid Precoding Algorithms For Millimeter Wave Massive Mimo Systems written by Osama Alluhaibi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
Mmwave Massive Mimo
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Author : Shahid Mumtaz
language : en
Publisher: Academic Press
Release Date : 2016-12-02
Mmwave Massive Mimo written by Shahid Mumtaz and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-12-02 with Technology & Engineering categories.
mmWave Massive MIMO: A Paradigm for 5G is the first book of its kind to hinge together related discussions on mmWave and Massive MIMO under the umbrella of 5G networks. New networking scenarios are identified, along with fundamental design requirements for mmWave Massive MIMO networks from an architectural and practical perspective. Working towards final deployment, this book updates the research community on the current mmWave Massive MIMO roadmap, taking into account the future emerging technologies emanating from 3GPP/IEEE. The book's editors draw on their vast experience in international research on the forefront of the mmWave Massive MIMO research arena and standardization. This book aims to talk openly about the topic, and will serve as a useful reference not only for postgraduates students to learn more on this evolving field, but also as inspiration for mobile communication researchers who want to make further innovative strides in the field to mark their legacy in the 5G arena. Contains tutorials on the basics of mmWave and Massive MIMO Identifies new 5G networking scenarios, along with design requirements from an architectural and practical perspective Details the latest updates on the evolution of the mmWave Massive MIMO roadmap, considering future emerging technologies emanating from 3GPP/IEEE Includes contributions from leading experts in the field in modeling and prototype design for mmWave Massive MIMO design Presents an ideal reference that not only helps postgraduate students learn more in this evolving field, but also inspires mobile communication researchers towards further innovation
International Conference On Innovative Computing And Communications
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Author : Ashish Khanna
language : en
Publisher: Springer Nature
Release Date : 2021-08-28
International Conference On Innovative Computing And Communications written by Ashish Khanna and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-08-28 with Technology & Engineering categories.
This book includes high-quality research papers presented at the Fourth International Conference on Innovative Computing and Communication (ICICC 2021), which is held at the Shaheed Sukhdev College of Business Studies, University of Delhi, Delhi, India, on February 20–21, 2021. Introducing the innovative works of scientists, professors, research scholars, students and industrial experts in the field of computing and communication, the book promotes the transformation of fundamental research into institutional and industrialized research and the conversion of applied exploration into real-time applications.
Proceedings Of Sixth International Congress On Information And Communication Technology
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Author : Xin-She Yang
language : en
Publisher: Springer Nature
Release Date : 2021-10-26
Proceedings Of Sixth International Congress On Information And Communication Technology written by Xin-She Yang and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-10-26 with Technology & Engineering categories.
This book gathers selected high-quality research papers presented at the Sixth International Congress on Information and Communication Technology, held at Brunel University, London, on February 25–26, 2021. It discusses emerging topics pertaining to information and communication technology (ICT) for managerial applications, e-governance, e-agriculture, e-education and computing technologies, the Internet of Things (IoT) and e-mining. Written by respected experts and researchers working on ICT, the book offers a valuable asset for young researchers involved in advanced studies. The book is presented in four volumes.
Ultra Dense Heterogeneous Networks
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Author : Wen Sun
language : en
Publisher: CRC Press
Release Date : 2022-09-14
Ultra Dense Heterogeneous Networks written by Wen Sun and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-09-14 with Computers categories.
Driven by the ever-increasing amount of mobile data, cellular networks evolve from small cell network to ultra-dense heterogeneous networks, to provide high system capacity and spectrum efficiency. By bringing base stations (BSs) to the approximate spatial scale and number magnitude, ultra-dense heterogeneous networks would definitely bring unprecedented paradigm changes to the network design. Firstly, along with densification of small cells, inter-cell interference becomes severe and may deteriorate performance of mobile users. Assigning network resources including bandwidth and time slots, while avoiding interference, desires serious consideration. Secondly, the coverage area of BSs becomes small and irregular, resulting in much frequent and complicated handovers when mobile users move around. How to ensure continuous communication and implement effective mobility management, and inter-cell resource allocation and cooperation, remains a challenging issue. Thirdly, such dynamic change in spatial dimension enables us to re-investigate available and ongoing communications and networking techniques, such as massive MIMO, CoMP, millimeter waves (mmWaves), carrier aggregation, full duplex radio, and D2D communications. To address the aforementioned challenging research issues, this book will investigate the service and QoE provisioning in ultra-dense heterogeneous networks. In particular, firstly we introduce ultra-dense heterogeneous networks by careful definition regarding spatial deployment, generic characteristics, and requirements of ultra-dense heterogeneous networks in order to ensure QoE of mobile users. Secondly, we depict the resource management among small cells in close proximity, mobility management for mobile users (address the super-frequent handovers), and interference management (dealing with the interference due to frequency-reuse in the vicinity). Thirdly, we study the enabling factors, and the integration of ultra-dense heterogeneous networks with enabling technologies, such as massive-MIMO, cloud-RAN, mmWaves, D2D, IoT. Finally, we conclude the book and indicate future directions and challenges.
Green And Software Defined Wireless Networks
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Author : Chih-Lin I
language : en
Publisher: Cambridge University Press
Release Date : 2019-04-25
Green And Software Defined Wireless Networks written by Chih-Lin I and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-04-25 with Computers categories.
An expert treatment of the state-of-the-art in green and soft communications, covering theory, design, and resource management strategies.