Описание: MIMO systems have been known to better the quality of service for wireless communication systems. This book discusses emerging techniques in MIMO systems to reduce complexities and keep benefits unaffected at the same time. It discusses about benefits and shortcomings of various MIMO technologies like spatial multiplexing, space time coding, spatial modulation, transmit antenna selection and various power allocation schemes to optimize the performance. Crux of the book is focus on MIMO communication over generalized fading channels as they can model the propagation of signals in a non-homogeneous environment. Relevant MATLAB codes are also included in the appendices. Book is aimed at graduate students and researchers in electronics and wireless engineering specifically interested in electromagnetic theory, antennas and propagation, future wireless systems, signal processing.
Описание: This volumes discusses various aspects regarding the capacity/achievable data rate of stationary Rayleigh fading channels. First, it analyses bounds on the achievable data rate with zero-mean proper Gaussian input symbols, which are capacity achieving in the coherent case, i.e., in case of perfect channel knowledge at the receiver. These bounds are tight in the sense that the difference between the upper and the lower bound is bounded for all SNRs. The lower bound converges to the coherent capacity for asymptotically small channel dynamics. Furthermore, these bounds are extended to the case of multiple-input multiple-output (MIMO) channels and to the case of frequency selective channels. In a further part, the present work studies the achievable rate with receivers based on synchronized detection and a code-aided channel estimation. For a specific type of such a receiver an approximate upper bound on the achievable rate is derived. The comparison of this approximate upper bound and the achievable data rate with receivers using synchronized detection based on a solely pilot based channel estimation gives an approximate upper bound on the possible gain by using this kind of code-aided channel estimation in comparison to the conventional receiver using a solely pilot based channel estimation. In addition, the achievable data rate with an optimal joint processing of pilot and data symbols is studied and a lower bound on the achievable rate for this case is derived. In this context, it is also shown which part of the mutual information of the transmitter and the receiver is discarded when using the conventional receiver with synchronized detection based on a solely pilot based channel estimation.
Описание: Against the backdrop of the emerging 3G wireless personal communications standards and broadband access network standard proposals, this volume covers a range of coding and transmission aspects for transmission over fading wireless channels. It presents the most important classic channel coding issues and also the exciting advances of the last decade, such as turbo coding, turbo equalisation and space-time coding. It endeavours to be the first book with explicit emphasis on channel coding for transmission over wireless channels. Divided into 4 parts: Part 1 - explains the necessary background for novices. It aims to be both an easy reading text book and a deep research monograph. Part 2 - provides detailed coverage of turbo conventional and turbo block coding considering the known decoding algorithms and their performance over Gaussian as well as narrowband and wideband fading channels. Part 3 - comprehensively discusses both space-time block and space-time trlis coding for the first time in literature. Part 4 - provides an overview of turbo equalisations, also referred to as turbo demodulation. The book systematically converts the lessons of Shannon's information theory into design principles applicable to practical wireless systems. It provides overall design performance studies, giving cognizance to the contradictory design requirements of bit error rate, implementational complexity, coding and interleaving delay, effective throughput, coding rate and other related systems design aspects in a comprehensive manner.
Автор: Matthias Ptzold Название: Mobile Fading Channels ISBN: 0471495492 ISBN-13(EAN): 9780471495499 Издательство: Wiley Цена: 11550 р. Наличие на складе: Поставка под заказ.
Описание: Mobile channel fading is a loss in transmission intensity caused by changes in the transmission medium. By dealing with the modelling, analysis and simulation of mobile fading channels this text provides a fundamental understanding of many issues in the area of mobile fading channel modelling. The main topics addressed in the volume are: fundamentals of stochastic and deterministic channel models and modelling and simulation of frequency-nonselective and frequency-selective fading channels. The guide also features methods for the design and realization of efficient channel simulators and fast channel simulators and MATLAB-programs for the evaluation and simulation of mobile fading channels.
Описание: This volume discusses various aspects of the capacity/achievable data rate of stationary Rayleigh fading channels, studying among other topics the achievable rate with receivers based on synchronized detection and a code-aided channel estimation.
Автор: Oviedo-Orta Название: Connexin Cell Communication Channels ISBN: 1439862575 ISBN-13(EAN): 9781439862575 Издательство: Taylor&Francis Рейтинг: Цена: 17903 р. Наличие на складе: Поставка под заказ.
Описание: Plasma membrane-associated channels known as gap junctions, along with their protein building blocks—connexins—have an important functional role in a range of immunological processes, including heart function, cell growth and specialization, and early development. Spanning basic science and potential clinical applications, Connexin Cell Communication Channels: Roles in the Immune System and Immunopathology assembles and synthesizes four decades of the most important research carried out in this field. The book first provides a historical overview of the discovery of these membrane channels in cells and tissues of the immune system. It describes their general molecular and biological characteristics and examines how they participate in the evolution, organization, function, and regulation of leukocytes, as well as their interaction with other tissues. The next section examines immunologically related disease scenarios where gap junctions and connexins have been shown to play a fundamental role. The contributors explain how gap junctional communication participates in the establishment and maintenance of immunological properties such as antibody and cytokine production, as well as lymphocyte immune surveillance in both physiological and pathological conditions. The book explores the most important technical approaches used and how they have been specially adapted to answer key biological questions particular to the mobile nature of leukocytes. It also describes the most recent understanding of how gap junctions and connexins participate in antigen recognition, cross-presentation, lymphocyte activation, and in the assembly and function of the immunological synapse. Finally, the book focuses on the latest progress made on translating the knowledge gained to specific treatment modalities. Topics in this section include approaches for reducing scarring and cardiac arrhythmia, combating inflammation in the central nervous system, and enhancing epithelial tissue repair. A comprehensive view of achievements in this promising field, the book will inform and update specialists, clinical practitioners, and those studying the potential for commercial applications.
Описание: The most natural way for human communication is speech. This fact makes automatic speech recognition (ASR) a very attractive way for human-machine interaction. During the last four years, this subject has been extensively treated in journals and conferences, but until now there was no book available on the market to cover it.
Описание: As a result of higher frequencies and increased user mobility, researchers and systems designers are shifting their focus from time-invariant models to channels that vary within a block. Wireless Communications Over Rapidly Time-Varying Channels explains the latest theoretical advances and practical methods to give an understanding of rapidly time varying channels, together with performance trade-offs and potential performance gains, providing the expertise to develop future wireless systems technology. As well as an overview of the issues of developing wireless systems using time-varying channels, the book gives extensive coverage to methods for estimating and equalizing rapidly time-varying channels, including a discussion of training data optimization, as well as providing models and transceiver methods for time-varying ultra-wideband channels.
Описание: "Wireless Communications over MIMO Channels: Applications to CDMA and Multiple Antenna Systems" covers both, state of the art channel coding concepts
and CDMA and multiple antenna systems, rarely found in other books on the subject. Furthermore, an information theoretical analysis of CDMA and SDMA systems illuminate ultimate
limits and demonstrates the high potential of these concepts. Besides spatial multiplexing, the use of multiple transmit antennas in order to increase the link reliability by diversity concepts
(space time coding) is described.
Another focus is the application of error control coding in mobile radio communications. Accompanying appendices include: basic
derivations, tables of frequently used channel models, chain rules for entropy and information, data processing theorem, basics of linear algebra, Householder reflection and Givens
rotation, and the LLL algorithm for lattice reduction.
Описание: As a result of higher frequencies and increased user mobility researchers and systems designers are shifting their focus from time-invariant models to channels that vary within a block. This book explains the latest theoretical advances and practical methods to give an understanding of rapidly time varying channels, together with performance trade-offs and potential performance gains, providing the expertise to develop future wireless systems technology. As well as an overview of the issues of developing wireless systems using time-varying channels, the book gives extensive coverage to methods for estimating and equalizing rapidly time-varying channels, including a discussion of training data optimization, as well as providing models and transceiver methods for time-varying ultra-wideband channels. <br><br>*An introduction to time-varying channel models gives in a nutshell the important issues of developing wireless systems technology using time-varying channels<br><br>*Extensive coverage of methods for estimating and equalizing rapidly time-varying channels, including a discussion of training data optimization, enables development of high performance wireless systems<br><br>*Chapters on transceiver design for OFDM and receiver algorithms for MIMO communication channels over time-varying channels, with an emphasis on modern iterative turbo-style architectures, demonstrates how these important technologies can optimize future wireless systems
Описание: Following the success of the first edition, this edition is revised in light of new developments in near-capacity turbo-transceivers. Coverage includes Multilevel Coding Theory; MLC Design Using EXIT Analysis; Space Time Sphere Packing Aided MLC/ BICM Design; MLC/ BICM Schemes for Wireless Internet and Near-Capacity Irregular BICM-ID Design.
Автор: Patzold Название: Mobile Radio Channels, 2nd Edition ISBN: 0470517476 ISBN-13(EAN): 9780470517475 Издательство: Wiley Рейтинг: Цена: 13687 р. Наличие на складе: Поставка под заказ.
Описание: Building on the success of the first edition while filling a gap in the current literature, Mobile Radio Channels, Second Edition provides an understanding of the key issues currently being investigated in the area of mobile fading channel modeling.
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