توضیحات
The investigation of the propagation channel is becoming more and more important in modern wireless communication. The demand for spectral efficiency motivates exploitation of all channels that can possibly be used for communications. Nowadays, a common trend for designing physical layer algorithms is to adapt the transceiving strategy, either by maximizing the diversity gains or by utilizing the coherence of the channels to improve the signal-to-noise power ratio.
Dr. Xiang Cheng and I have been working on topics relevant to channel characterization for years. My major research has been focused on measurement-based stochastic channel modeling using high-resolution estimates of the channel parameter from real measurement data Xiang’s work concentrates more on accurate yet easy-to-use channel modeling and simulation based on geometry-based stochastic channel modeling approach. This book is intended to cover both theoretical and experimental studies of channels by merging Xiang’s and my own study results, obtained in the last decade. Most of the content has been published in journals and conference proceedings. New results that are still under review for publication are also addressed in order to give a complete presentation of specific topics. In general, the book can be viewed as a collection of the latest results in the field of theoretical and experimental channel characterization. The contributions of Dr. Xiang Cheng and myself to this book are equivalent.
There are already several books dedicated to channel investigations (Durgin 2003, Koivunen 2007, Parsons 2000, Saunders 1999, P¨atzold 2002). Our book includes more of an introduction to the methods used for the steps of channel characterization than these earlier studies, instead of presenting only the final results. From this point of view, our book tells more complete stories about channels, linking the methods applied in the different stages of channel analysis. Furthermore, combining the description of theoretical and the empirical methods in one book helps the reader conceive more clearly the merits of these methods. Another feature of the book is that we also cover the methods used for extracting the parameters of generic models. Normally, books address channels in one or two chapters and do not describe and comment on theme thods used for characterizing them.An example is the book by (Correia 2001). However, since readers usually want to know how realistic the models are, it is important to give a clear view of the underlying methods. Although some of the methods described in this book have also been described in the literature for general cases (McLachlan and Krishnan 1997,Stoica and Moses 1997), we focus on the adaptation ofmethods applied for analyzing the propagation channels.
This book can be used as a textbook for the courses dedicated for propagation channel characterization, or for parts of courses that focus on wireless communication systems and networks. We organize the book in such a way that the chapters are self-contained and can be selected individually for specific topics. We start in Chapter 2 by introducing the phenomena of propagation in wireless communication channels and the terminologies, and also the parameters used to characterize their properties. Then, in Chapter 3, the generic parametric models applied for representing multiple components in channel impulse responses are introduced. For stochastic behaviors of channels represented by these model parameters, statistical models are needed. We, therefore, review the approaches adopted in channel characterization and modeling; from their theoretical aspects in Chapter 4 and by using measurements in Chapter 5. The impacts of measurement equipment on the observations and model accuracy are also discussed in Chapter 5. Chapters 6 and 7 introduce the high-resolution channel-parameter estimation methods for extracting the parameters of the generic channel models from measurement data, based on deterministic specular-path models and statistical models, respectively. Chapter 8 elaborates the modeling procedure and key techniques for constructing stochastic models based on parameter estimates. At the end of the book, Chapter 9 illustrates specific channel models for different communication systems as examples of the methods and techniques introduced in this book.
by: Xuefeng Yin , Xiang Cheng
File Information :English Language/403 Page/Size :8.19M
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کاری از: Xuefeng Yin , Xiang Cheng
اطلاعات فایل: زبان انگلیسی/ صفحه 403/سایز:8.19M
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