This lecture covers the fundamentals of spread spectrum modulation, which can be defined as any modulation technique that requires a transmission bandwidth much greater than the modulating signal bandwidth, independently of the bandwidth of the modulating signal. After reviewing basic digital modulation techniques, the principal forms of spread spectrum modulation are described. One of the most important components of a spread spectrum system is the spreading code, and several types and their characteristics are described. The most essential operation required at the receiver in a spread spectrum system is the code synchronization, which is usually broken down into the operations of acquisition and tracking. Means for performing these operations are discussed next. Finally, the performance of spread spectrum systems is of fundamental interest and the effect of jamming is considered, both without and with the use of forward error correction coding. The presentation ends with consideration of spread spectrum systems in the presence of other users.
TEACCH (Treatment and Education of Autistic and related Communication-handicapped Children) has grown over the past three decades from a small clinic for children to an internationally recognized treatment and support modality for individuals of all ages with autism spectrum disorders. In The TEACCH Approach to Autism Spectrum Disorders, the programâs founders and their colleagues explain its methods and philosophy based on an understanding and respect for "the culture of autism."The TEACCH program focuses on persons with autism and the development of instruction and supports based on each individualâs skills, interests, and needs. It draws from the research literature in psychology and ne...
Spectrum analysis can be considered as a topic in statistics as well as a topic in digital signal processing (DSP). This book takes a middle course by emphasizing the time series models and their impact on spectrum analysis. The text begins with elements of probability theory and goes on to introduce the theory of stationary stochastic processes. The depth of coverage is extensive. Many topics of concern to spectral characterization of Gaussian and non-Gaussian time series, scalar and vector time series are covered. A section is devoted to the emerging areas of non-stationary and cyclostationary time series. The book is organized more as a textbook than a reference book. Each chapter includes many examples to illustrate the concepts described. Several exercises are included at the end of each chapter. The level is appropriate for graduate and research students.
Spread spectrum and CDMA are cutting-edge technologies widely used in operational radar, navigation and telecommunication systems and play a pivotal role in the development of the forthcoming generations of systems and networks. This comprehensive resource presents the spread spectrum concept as a product of the advancements in wireless IT, shows how and when the classical problems of signal transmission/processing stimulate the application of spread spectrum, and clarifies the advantages of spread spectrum philosophy. Detailed coverage is provided of the tools and instruments for designing spread spectrum and CDMA signals answering why a designer will prefer one solution over another. The a...
"Written for vibration analysts, predictive maintenance specialists, field mechanics, and a wide variety of engineers, Vibration Spectrum Analysis assumes no prior knowledge of advanced mathematics or mechanical engineering. It carefully guides the reader through sophisticated analysis techniques in a logical, easy-to-understand manner."--BOOK JACKET.
New developments in the response spectrum method have led to calculations in seismic stresses that are more accurate, and usually lower, than those obtained by conventional methods. This new textbook examines the wealth of information on the response spectrum method generated by the latest research and presents the background theory in simplified form. Applications of these methods is essential in the seismic design of critical structures, such as nuclear power plants and petroleum facilities. In new construction, the reduced seismic stresses will result in efficient and economic design. For facilities already built, these more accurate methods can be used where the facility is being reassessed for higher loads and in the calculation of margins. Written by an acknowledged expert in this and related fields, this volume is ideal as a graduate text for courses in structural and earthquake engineering. It is also an excellent reference for civil, structural, mechanical, and earthquake engineers.
This wide-ranging, well-illustrated book offers all kinds of tried and tested strategies to help young people with autistic spectrum disorders develop and learn. Designed to be a really practical guide for nursery nurses, teachers and support staff in mainstream schools, as well as parents, the guide focuses on both work and play. 'Every parent, teacher or teaching assistant who supports a child with autistic tendencies should have a copy of this book.' Fiona Jukes, Learning Support Assistant This wide-ranging, well-illustrated book offers all kinds of tried and tested strategies to help young people with autistic spectrum disorders develop and learn. Designed to be a really practical guide for nursery nurses, teachers and support staff in mainstream schools, as well as parents, the guide focuses on both work and play and includes helpful guidance on numeracy and literacy.
'Physicists, chemists and astronomers, as well as historians and philosophers of science and ideas, and the intelligent layman will all find much that is thought provoking and fascinating in this book, which also includes an extensive bibliography.' -Astrophysics and Space ScienceThis book describes how advances in recording and printing technologies have influenced the research and teaching style of succeeding generations of physicists, chemists, and astronomers, particularly from the boom of spectrum analysis in the 1860s until the advent of quantum mechanics. Seemingly disparate strands such as spectrochemistry and cartography, instrument-design and science education are woven into the rich tapestry of one of the most fascinating and influential research-technologies of the late 19th and early 20th century.