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Author: Shahab Sanayei
Publisher:
ISBN:
Category : Electrical engineering
Languages : en
Pages : 28
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Book Description
Opportunistic methods solve dynamic resource allocation problems by choosing only one (or a few) out of many allocation options at each point in time, thus solving the problem in sub-optimal, but efficient ways. This work explores several opportunistic methods in wireless communications and provides an analytic framework for such problems under limited feedback. An instance of opportunistic communication is antenna selection, a low-cost, low-complexity MIMO (multiple-input multiple-output) method that uses, at each point in time, the best of available antennas. We consider capacity-maximizing antenna selection algorithms, and explore their asymptotic performance at high- and low-SNR, as well as scaling laws with the number of antennas. We propose fast algorithms for joint transmit-receive antenna selection. We analyze the capacity and diversity of antenna selection algorithms under the so-called keyhole condition. In a multi-user network, opportunistic scheduling effectively captures multi-user diversity in the downlink, however, existing techniques require substantial channel state information, per user, at the base station. We propose a simple scheduling algorithm to achieve the multiuser diversity advantage with only minimal feedback requirement and prove its desirable properties in terms of the sum-rate capacity. Using this novel approach, we propose a beamforming scheme with limited-rate feedback in multiuser MIMO systems and show its superior performance over the known methods. Finally we extend our scheduling method to multiuser OFDM networks where reduction of feedback overhead is a crucial issue.
Author: Shahab Sanayei
Publisher:
ISBN:
Category : Electrical engineering
Languages : en
Pages : 28
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Book Description
Opportunistic methods solve dynamic resource allocation problems by choosing only one (or a few) out of many allocation options at each point in time, thus solving the problem in sub-optimal, but efficient ways. This work explores several opportunistic methods in wireless communications and provides an analytic framework for such problems under limited feedback. An instance of opportunistic communication is antenna selection, a low-cost, low-complexity MIMO (multiple-input multiple-output) method that uses, at each point in time, the best of available antennas. We consider capacity-maximizing antenna selection algorithms, and explore their asymptotic performance at high- and low-SNR, as well as scaling laws with the number of antennas. We propose fast algorithms for joint transmit-receive antenna selection. We analyze the capacity and diversity of antenna selection algorithms under the so-called keyhole condition. In a multi-user network, opportunistic scheduling effectively captures multi-user diversity in the downlink, however, existing techniques require substantial channel state information, per user, at the base station. We propose a simple scheduling algorithm to achieve the multiuser diversity advantage with only minimal feedback requirement and prove its desirable properties in terms of the sum-rate capacity. Using this novel approach, we propose a beamforming scheme with limited-rate feedback in multiuser MIMO systems and show its superior performance over the known methods. Finally we extend our scheduling method to multiuser OFDM networks where reduction of feedback overhead is a crucial issue.
Author: Berna Özbek
Publisher: Springer Science & Business Media
ISBN: 1461477417
Category : Technology & Engineering
Languages : en
Pages : 344
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Book Description
This book explores the different strategies regarding limited feedback information. The book analyzes the impact of quantization and the delay of CSI on the performance. The author shows the effect of the reduced feedback information and gives an overview about the feedback strategies in the standards. This volume presents theoretical analysis as well as practical algorithms for the required feedback information at the base stations to perform adaptive resource algorithms efficiently and mitigate interference coming from other cells.
Author: Zhe Wang
Publisher: Springer
ISBN: 3319155423
Category : Technology & Engineering
Languages : en
Pages : 70
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Book Description
This Springer Brief investigates spectrum sharing with limited channel feedback in various cognitive radio systems, such as point-to-point, broadcast scheduling and ad-hoc networks. The design aim is to optimally allocate the secondary resources to improve the throughput of secondary users while maintaining a certain quality of service for primary users. The analytical results of optimal resource allocation are derived via optimization theory and are verified by the numerical results. The results demonstrate the secondary performance is significantly improved by limited feedback and is further improved by more feedback bits, more secondary receivers and more primary side information.
Author: Sudhir Srinivasa
Publisher:
ISBN: 9780549865759
Category :
Languages : en
Pages : 266
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Book Description
This thesis is motivated by the need to understand the advantages and fundamental limitations of side information in different wireless networks. Based on the available side information, transmit strategies in a wireless system can be designed with two contrasting goals in mind: (1) help the desired receiver by directing power along its own channel (beamforming), or (2) help the undesired receivers by minimizing interference caused to them (avoiding interference). We explore these two goals separately in this two part thesis.
Author: Ismail Guvenc
Publisher: Cambridge University Press
ISBN: 1139500376
Category : Technology & Engineering
Languages : en
Pages : 427
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Book Description
Ensuring reliable communication is an important concern in short-range wireless communication systems with stringent quality of service requirements. Key characteristics of these systems, including data rate, communication range, channel profiles, network topologies and power efficiency, are very different from those in long-range systems. This comprehensive book classifies short-range wireless technologies as high and low data rate systems. It addresses major factors affecting reliability at different layers of the protocol stack, detailing the best ways to enhance the capacity and performance of short-range wireless systems. Particular emphasis is placed on reliable channel estimation, state-of-the-art interference mitigation techniques and cooperative communications for improved reliability. The book also provides detailed coverage of related international standards including UWB, ZigBee, and 60 GHz communications. With a balanced treatment of theoretical and practical aspects of short-range wireless communications and with a focus on reliability, this is an ideal resource for practitioners and researchers in wireless communications.
Author: Nalân Gülpınar
Publisher: Springer Science & Business Media
ISBN: 1441905340
Category : Business & Economics
Languages : en
Pages : 262
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Book Description
This volume covers recent developments in the design, operation, and management of mobile telecommunication and computer systems. Uncertainty regarding loading and system parameters leads to challenging optimization and robustness issues. Stochastic modeling combined with optimization theory ensures the optimum end-to-end performance of telecommunication or computer network systems. In view of the diverse design options possible, supporting models have many adjustable parameters and choosing the best set for a particular performance objective is delicate and time-consuming. An optimization based approach determines the optimal possible allocation for these parameters. Researchers and graduate students working at the interface of telecommunications and operations research will benefit from this book. Due to the practical approach, this book will also serve as a reference tool for scientists and engineers in telecommunication and computer networks who depend upon optimization.
Author: Uysal, Murat
Publisher: IGI Global
ISBN: 1605666661
Category : Computers
Languages : en
Pages : 632
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Book Description
Offers practitioners, researchers, and academicians with fundamental principles of cooperative communication. This book provides readers diverse findings and exposes underlying issues in the analysis, design, and optimization of wireless systems.
Author: Alessandro Bazzi
Publisher: BoD – Books on Demand
ISBN: 9533070919
Category : Technology & Engineering
Languages : en
Pages : 724
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Book Description
In the last decades the restless evolution of information and communication technologies (ICT) brought to a deep transformation of our habits. The growth of the Internet and the advances in hardware and software implementations modified our way to communicate and to share information. In this book, an overview of the major issues faced today by researchers in the field of radio communications is given through 35 high quality chapters written by specialists working in universities and research centers all over the world. Various aspects will be deeply discussed: channel modeling, beamforming, multiple antennas, cooperative networks, opportunistic scheduling, advanced admission control, handover management, systems performance assessment, routing issues in mobility conditions, localization, web security. Advanced techniques for the radio resource management will be discussed both in single and multiple radio technologies; either in infrastructure, mesh or ad hoc networks.
Author: David Tse
Publisher: Cambridge University Press
ISBN: 1139444662
Category : Technology & Engineering
Languages : en
Pages : 598
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Book Description
The past decade has seen many advances in physical layer wireless communication theory and their implementation in wireless systems. This textbook takes a unified view of the fundamentals of wireless communication and explains the web of concepts underpinning these advances at a level accessible to an audience with a basic background in probability and digital communication. Topics covered include MIMO (multi-input, multi-output) communication, space-time coding, opportunistic communication, OFDM and CDMA. The concepts are illustrated using many examples from real wireless systems such as GSM, IS-95 (CDMA), IS-856 (1 x EV-DO), Flash OFDM and UWB (ultra-wideband). Particular emphasis is placed on the interplay between concepts and their implementation in real systems. An abundant supply of exercises and figures reinforce the material in the text. This book is intended for use on graduate courses in electrical and computer engineering and will also be of great interest to practising engineers.
Author: Mohammed E. Eltayeb
Publisher:
ISBN:
Category : Computer engineering
Languages : en
Pages : 156
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Book Description
In multiuser networks, the base stations (BSs) rely on the channel state information (CSI) of the users to perform user scheduling and downlink transmissions. While the downlink channels can be easily estimated at all user terminals via a single broadcast, several key challenges are faced during uplink (feedback) transmissions. Firstly, the amount of air-time consumed during feedback transmission grows linearly with the number of users. This domination of the network resources by feedback traffic leads to increased scheduling delay and outdated CSI at the BS. Secondly , the fed back CSI is generally corrupted by the fading and noisy feedback channel. This could lead to transmission outages if the network scheduler bases its scheduling decisions on inaccurate CSI. These challenges make CSI acquisition arduous, if not impossible, in practice. In this research, we develop efficient scheduling algorithms that account for the feedback channel impairments of multiuser wireless networks. The proposed algorithms encompass both single and dual-hop wireless networks, and; permit the BS to obtain CSI with acceptable recovery guarantees under substantially reduced feedback overhead. More specifically, we consider feedback reduction for i) multiuser networks with single antenna base stations, ii) multiuser user networks with multi-antenna base stations, and iii) cooperative multiuser networks. Analytical and simulations results show that the proposed algorithms, together with the proposed feedback noise mitigation techniques, drastically reduce the feedback overhead, and achieve a rate close to that obtained by scheduling algorithms that require noiseless dedicated feedback from all users.
