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Broadband Wireless Access (BWA) systems have gained a lot of attention in the industry for providing flexible and easy deployment solutions to high-speed wireless communications technology such as WiMAX. Orthogonal Frequency Division Multiplexing (OFDM) system is one of the technologies that can offer BWA efficiently. However, there are certain problems with the OFDM system that need to be solved. In this thesis, a system based on OFDM scheme and principles has been designed to deliver high-speed mobile broadband services with great efficiency and reliability, with emphasis on resolving the problems that current OFDM systems face. A comprehensive investigation of OFDM systems are performed. We highlight and analyze in detail the current problems with channel estimation, synchronization and resource allocation of OFDM systems. We propose a new efficient channel estimation technique for the OFDM technology. Furthermore, we present an enhanced synchronization technique to mitigate frequency errors from which OFDM systems normally suffer in certain multipath environment.
Multi-Carrier Techniques for Broadband Wireless Communications provides an accessible introduction to OFDM-based systems from a signal processing perspective. The first part presents a concise treatment of some fundamental concepts related to wireless communications and multicarrier systems, while the second offers a comprehensive survey of recent developments on a variety of critical design issues. These include synchronization techniques, channel estimation methods, adaptive resource allocation and practical schemes for reducing the peak-to-average power ratio of the transmitted waveform.
ulti-carrier modulation‚ Orthogonal Frequency Division Multi- Mplexing (OFDM) particularly‚ has been successfully applied to a wide variety of digital communications applications over the past several years. Although OFDM has been chosen as the physical layer standard for a diversity of important systems‚ the theory‚ algorithms‚ and implementation techniques remain subjects of current interest. This is clear from the high volume of papers appearing in technical journals and conferences. Multi-carrier modulation continues to evolve rapidly. It is hoped that this book will remain a valuable summary of the technology‚ p- viding an understanding of new advances as well as the present core technology. The Intended Audience This book is intended to be a concise summary of the present state of the art of the theory and practice of OFDM technology. The authors believe that the time is ripe for such a treatment. Particularly based on one of the author’s long experience in development of wireless systems (AB), and the other’s in wireline systems (BS)‚ we have - tempted to present a unified presentation of OFDM performance and xviii implementation over a wide variety of channels. It is hoped that this will prove valuable both to developers of such systems and to researchers and graduate students involved in analysis of digital communications.
OFDM-based Broadband Wireless Networks covers the latest technological advances in digital broadcasting, wireless LAN, and mobile networks to achieve high spectral efficiency, and to meet peak requirements for multimedia traffic. The book emphasizes the OFDM modem, air-interface, medium access-control (MAC), radio link protocols, and radio network planning. An Instructor Support FTP site is available from the Wiley editorial department.
Supported by the expert-level advice of pioneering researchers, Orthogonal Frequency Division Multiple Access Fundamentals and Applications provides a comprehensive and accessible introduction to the foundations and applications of one of the most promising access technologies for current and future wireless networks. It includes authoritative cove
The Definitive Guide to WiMAX Technology WiMAX is the most promising new technology for broadband wireless access to IP services. It can serve an extraordinary range of applications and environments: data, voice, and multimedia; fixed and mobile; licensed and unlicensed. However, until now, wireless professionals have had little reliable information to guide them. Fundamentals of WiMAX is the first comprehensive guide to WiMAX—its technical foundations, features, and performance. Three leading wireless experts systematically cut through the hype surrounding WiMAX and illuminate the realities. They combine complete information for wireless professionals and basic, accessible knowledge for non-experts. Professionals will especially appreciate their detailed discussion of the performance of WiMAX based on comprehensive link- and system-level simulations. Whether you're a wireless engineer, network architect, manager, or system designer, this book delivers essential information for succeeding with WiMAX—from planning through deployment. Topics include Applications, history, spectrum options, technical and business challenges, and competitive technologies of WiMAX 802.16 standards: physical and MAC layers, channel access, scheduling services, mobility, advanced antenna features, hybrid-ARQ, and more Broadband wireless channels: pathloss, shadowing, cellular systems, sectoring, and fading—including modeling and mitigation OFDM: from basic multicarrier concepts to synchronization, PAR reduction, and clipping MIMO: Multiple antennas, spatial diversity, beamforming, and a cutting-edge treatment of the use of MIMO in WiMAX OFDMA: multiple access, multiuser diversity, adaptive modulation, and resource allocation Networking and services aspects: architecture and protocols for IP QoS, session management, ecurity, and mobility management Predicting performance using link-level and system-level simulations WiMAX network architecture: design principles, reference models, authentication, QoS, and mobility management
Broadband wireless communication requires fast and reliable synchronization and channel estimation with low overhead and computation complexity. In this work, we address the above issue by two aspects. First, we develop training signal design for not only achieving low complexity reliable receiver processing algorithms, but also improving the theoretical limit. Second, we develop low complexity high performance receiver algorithms for both single user and multiuser system. We first investigate the optimal periodic preamble design for frequency offset estimation over frequency-selective fading channels by minimizing the average Cramer-Rao bound (CRB). The proposed design includes the optimal sequence structure design and the optimal signal design, and brings new dimensions into the existing theory of the training signal designs for frequency offset estimation. To track the channel variations as well as the phase shift, data-pilot multiplexing scheme is commonly used in OFDM (orthogonal frequency division multiplex) systems. The two performance metrics which are not jointly incorporated yet in the existing data-pilot multiplexing scheme design are the number of data tones transmitted over one OFDM symbol (data throughput) and the channel response and phase estimation performance. In this work, we propose two multiplexing schemes which significantly improve the estimation performance with low data throughput sacrifice, resulting in a substantial performance improvement over current pilot-data multiplexed schemes. In the uplink of OFDMA (orthogonal frequency division multiple access) systems, synchronization and channel estimation problems become more challenging since multiuser, multi-dimension parameters rather than single user parameters issue have to be estimated. The existing techniques have one or more of the following unfavorable requirements: high computation complexity, loss of frequency diversity, and performance sensitivity to the number of subscribe stations. To address the above drawbacks, we propose several training designs as well as the corresponding estimators for OFDMA uplink in this thesis, yielding robust low complexity estimators with enhanced performance.
Orthogonal Frequency Division Multiplexing for Wireless Communications is an edited volume with contributions by leading authorities in the subject of OFDM. Its coverage consists of principles, important wireless topics (e.g. Synchronization, channel estimation, etc.) and techniques. Included is information for advancing wireless communication in a multipath environment with an emphasis on implementation of OFDM in base stations. Orthogonal Frequency Division Multiplexing for Wireless Communications provides a comprehensive introduction of the theory and practice of OFDM. To facilitate the readers, extensive subject indices and references are given at the end of the book. Even though each chapter is written by different experts, symbols and notations in all chapters of the book are consistent.
This introductory volume provides a systematic overview of WiMAX technology, demystifing the technology and providing technical advice on various system trade-offs. Much of the material is based on the practical experiences of the authors in building new systems. Coverage includes the IEEE 802.16 standard, a tutorial on implementation and tips on controlling cost of WiMAX network ownership. This is a must read book for professionals involved in broadband fixed wireless access.