Characterization and Modeling of Wireless Channel Transitions PDF Download

Author:
Publisher:
ISBN:
Category : Broadband communication systems
Languages : en
Pages :

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Author: Vijayalakshmi Vasudevan
Publisher:
ISBN:
Category : Wireless communication systems
Languages : en
Pages : 148

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Book Description

Author: Xuefeng Yin
Publisher: John Wiley & Sons
ISBN: 111818825X
Category : Technology & Engineering
Languages : en
Pages : 410

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Book Description
A comprehensive reference giving a thorough explanation of propagation mechanisms, channel characteristics results, measurement approaches and the modelling of channels Thoroughly covering channel characteristics and parameters, this book provides the knowledge needed to design various wireless systems, such as cellular communication systems, RFID and ad hoc wireless communication systems. It gives a detailed introduction to aspects of channels before presenting the novel estimation and modelling techniques which can be used to achieve accurate models. To systematically guide readers through the topic, the book is organised in three distinct parts. The first part covers the fundamentals of the characterization of propagation channels, including the conventional single-input single-output (SISO) propagation channel characterization as well as its extension to multiple-input multiple-output (MIMO) cases. Part two focuses on channel measurements and channel data post-processing. Wideband channel measurements are introduced, including the equipment, technology and advantages and disadvantages of different data acquisition schemes. The channel parameter estimation methods are then presented, which include conventional spectral-based estimation, the specular-path-model based high-resolution method, and the newly derived power spectrum estimation methods. Measurement results are used to compare the performance of the different estimation methods. The third part gives a complete introduction to different modelling approaches. Among them, both scattering theoretical channel modelling and measurement-based channel modelling approaches are detailed. This part also approaches how to utilize these two modelling approaches to investigate wireless channels for conventional cellular systems and some new emerging communication systems. This three-part approach means the book caters for the requirements of the audiences at different levels, including readers needing introductory knowledge, engineers who are looking for more advanced understanding, and expert researchers in wireless system design as a reference. Presents technical explanations, illustrated with examples of the theory in practice Discusses results applied to 4G communication systems and other emerging communication systems, such as relay, CoMP, and vehicle-to-vehicle rapid time-variant channels Can be used as comprehensive tutorial for students or a complete reference for engineers in industry Includes selected illustrations in color Program downloads available for readers Companion website with program downloads for readers and presentation slides and solution manual for instructors Essential reading for Graduate students and researchers interested in the characteristics of propagation channel, or who work in areas related to physical layer architectures, air interfaces, navigation, and wireless sensing

Author: Lu Bai
Publisher: Springer Nature
ISBN: 3031575032
Category :
Languages : en
Pages : 234

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Book Description

Author: Ruisi He
Publisher: CRC Press
ISBN: 1003830331
Category : Technology & Engineering
Languages : en
Pages : 270

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Book Description
This book delves into the fundamental characteristics, measurement techniques, modeling methods, and theories of wireless channels in mobile scenarios. Unlike wired communication systems, which are more predictable, wireless communication systems are significantly affected by radio propagation and wireless channels. By investigating the mechanisms of wireless channels and measurement techniques, this book aims to better understand wireless communication systems in order to optimize the quality and design of wireless communications. The title covers key topics in the field, including basic theory of radio wave propagation and non-stationary channels, theory and method of time-varying channel measurement, measurement case analysis, wireless channel modeling theory and parameter extraction method, rail traffic channel measurement and modeling, and dynamic modeling and simulation method of time-varying channels. This book is suitable for researchers and students interested in radio wave propagation, wireless channels and mobile communication systems. It can also serve as a useful guide for technical professionals who have a background in mobile communication technology.

Author: Chan-Ping Edwin Lim
Publisher:
ISBN:
Category : MIMO systems
Languages : en
Pages : 111

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Book Description
Abstract: A new full wave methodology and a well-established ray-tracing method are employed for indoor wireless communications channel modeling. The full-wave method, referred to as array decomposition-fast multipole method (AD-FMM) for indoor simulation, is based on the finite element-boundary integral formulation. A key feature of this technique is the use of domain decomposition methods to efficiently model repeatable components such as bricks, chairs, tables, etc. This leads to significant memory reduction allowing the simulation of realistic structures with different antenna locations to predict the statistical profiles of the received signal strength. These profiles are subsequently used to evaluate the bit error rate (BER) for specific digital modulation schemes. The method is also employed to predict the statistical channel capacity for multiple input multiple output (MIMO) systems via the complementary cumulative distribution function. This dissertation also exploits an established ray-tracing electromagnetic (EM) simulation tool, and measurements for indoor channel characterization for wireless applications. Specifically, measurements are conducted for indoor environments to validate the channel model obtained using ray tracing tools. Such ray-tracing channel models are appropriate for 4th generation 60~GHz communication systems.

Author: Xuefeng Yin
Publisher: John Wiley & Sons
ISBN: 1118188233
Category : Technology & Engineering
Languages : en
Pages : 408

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Book Description
A comprehensive reference giving a thorough explanation of propagation mechanisms, channel characteristics results, measurement approaches and the modelling of channels Thoroughly covering channel characteristics and parameters, this book provides the knowledge needed to design various wireless systems, such as cellular communication systems, RFID and ad hoc wireless communication systems. It gives a detailed introduction to aspects of channels before presenting the novel estimation and modelling techniques which can be used to achieve accurate models. To systematically guide readers through the topic, the book is organised in three distinct parts. The first part covers the fundamentals of the characterization of propagation channels, including the conventional single-input single-output (SISO) propagation channel characterization as well as its extension to multiple-input multiple-output (MIMO) cases. Part two focuses on channel measurements and channel data post-processing. Wideband channel measurements are introduced, including the equipment, technology and advantages and disadvantages of different data acquisition schemes. The channel parameter estimation methods are then presented, which include conventional spectral-based estimation, the specular-path-model based high-resolution method, and the newly derived power spectrum estimation methods. Measurement results are used to compare the performance of the different estimation methods. The third part gives a complete introduction to different modelling approaches. Among them, both scattering theoretical channel modelling and measurement-based channel modelling approaches are detailed. This part also approaches how to utilize these two modelling approaches to investigate wireless channels for conventional cellular systems and some new emerging communication systems. This three-part approach means the book caters for the requirements of the audiences at different levels, including readers needing introductory knowledge, engineers who are looking for more advanced understanding, and expert researchers in wireless system design as a reference. Presents technical explanations, illustrated with examples of the theory in practice Discusses results applied to 4G communication systems and other emerging communication systems, such as relay, CoMP, and vehicle-to-vehicle rapid time-variant channels Can be used as comprehensive tutorial for students or a complete reference for engineers in industry Includes selected illustrations in color Program downloads available for readers Companion website with program downloads for readers and presentation slides and solution manual for instructors Essential reading for Graduate students and researchers interested in the characteristics of propagation channel, or who work in areas related to physical layer architectures, air interfaces, navigation, and wireless sensing

Author: Chau Vo
Publisher:
ISBN:
Category : Wireless communication systems
Languages : en
Pages : 37

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Book Description
Multipath fading is one of the significant factors that affect the performance of a wireless communications link. Theoretical results exist for calculating link performance in the presence of a fading channel for some modulation schemes and some types of fading. In other cases, link performance must be evaluated by simulation. Mathworks' Simulink is one tool used for these simulations. Mathworks provides pre-constructed blocks for both Rician and Rayleigh fading which accept parameters defining these fading models. The proper use of these blocks to include the parameters that define fading channels has been described. These blocks make it easy to model complex fading systems. Simulation results for link performance obtained using these channel-modeling blocks in BPSK and BFSK systems correspond closely to the theoretical results. The work presented here should be of interest to others studying wireless communications.

Author: Leslie Caroline Wood
Publisher:
ISBN:
Category :
Languages : en
Pages : 215

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Book Description
The use of multiple antennas at one or both ends of a communication link can improve both the capacity and reliability of the system in a fading environment. However, the performance of the system depends heavily on the inherent structure of the channel itself. In this dissertation we focus our attention on the characterization of the wireless channel, modeling the channel, and the practical implications of the channel knowledge on the transmission strategy. The first part of this dissertation considers single-input multiple-output (SIMO) transmission systems. For these systems, receiver diversity is available to improve the reliability of the communication link. The improvement available is governed by spatial correlation. This portion outlines the construction of a dual channel measurement system and channel measurements. Modeling is used to further understand the environment and the received power patterns. The second part of this dissertation focuses on multiple-input multiple-output (MIMO) transmission systems. MIMO channel models are introduced, along with a framework for comparing the predictive performances of the models. Two analytical models, the Kronecker model and the structured eigenbasis model, are examined in detail. The differences in how the underlying physics in the channel are captured by the models are discussed, highlighting the performance impact. Geometrical models are used to investigate the model representations of the correlation matrix and the impact of system parameters on the model structure. The final portion of this work focuses on practical transmission system considerations. The ability of analytical models to accurately predict the performance of two systems using M-QAM modulation is investigated. The performances of the two analytical models, the Kronecker and Weichselberger models, are compared against the predicted performance using measured data. Reduced rank modeling, and other strategies to reduce feedback overhead are discussed. Additionally, the issue of how to best use the channel, showing when spatial multiplexing is preferred for correlated channels, is explored. Finally, the time sensitivity of feedback on a system is discussed. The effect of delay is investigated and the predictive performance of the analytical models is explored.

Author: William Turin
Publisher: Springer Science & Business Media
ISBN: 1441990704
Category : Mathematics
Languages : en
Pages : 451

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Book Description
This book is an expanded third edition of the book Performance Analysis of Digital Transmission Systems, originally published in 1990. Second edition of the book titled Digital Transmission Systems: Performance Analysis and Modeling was published in 1998. The book is intended for those who design communication systems and networks. A computer network designer is interested in selecting communication channels, error protection schemes, and link control protocols. To do this efficiently, one needs a mathematical model that accurately predicts system behavior. Two basic problems arise in mathematical modeling: the problem of identifying a system and the problem of applying a model to the system analysis. System identification consists of selecting a class of mathematical objects to describe fundamental properties of the system behavior. We use a specific class of hidden Markov models (HMMs) to model communication systems. This model was introduced by C. E. Shannon more than 50 years ago as a Noisy Discrete Channel with a finite number of states. The model is described by a finite number of matrices whose elements are estimated on the basis of experimental data. We develop several methods of model identification and show their relationship to other methods of data analysis, such as spectral methods, autoregressive moving average CARMA) approximations, and rational transfer function approximations.