The Susceptibility of Direct Sequence and Frequency Hopped Spread Spectrum to Interference PDF Download

Author: David Purle
Publisher:
ISBN:
Category : Electric interference
Languages : en
Pages : 6

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Author: John Keelan Grosspietsch
Publisher:
ISBN:
Category : Radio filters
Languages : en
Pages : 350

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Author: Don Torrieri
Publisher: Springer Science & Business Media
ISBN: 1441995951
Category : Technology & Engineering
Languages : en
Pages : 589

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This book provides a concise but lucid explanation of the fundamentals of spread-spectrum systems with an emphasis on theoretical principles. Throughout the book, learning is facilitated by many new or streamlined derivations of the classical theory. Problems at the end of each chapter are intended to assist readers in consolidating their knowledge and to provide practice in analytical techniques. The choice of specific topics is tempered by the author’s judgment of their practical significance and interest to both researchers and system designers. The evolution of spread spectrum communication systems and the prominence of new mathematical methods in their design provided the motivation to undertake this new edition of the book. This edition is intended to enable readers to understand the current state-of-the-art in this field. More than 20 percent of the material in this edition is new, including a chapter on systems with iterative channel estimation, and the remainder of the material has been thoroughly revised.

Author: Robert Clyde Dixon
Publisher: Wiley-Interscience
ISBN:
Category : Science
Languages : en
Pages : 544

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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722795733
Category :
Languages : en
Pages : 46

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The objective of this test guide is to document appropriate unit level test methods and techniques for the performance of EMI testing of Direct Sequence (DS) spread spectrum receivers. Consideration of EMI test methods tailored for spread spectrum receivers utilizing frequency spreading, techniques other than direct sequence (such as frequency hopping, frequency chirping, and various hybrid methods) is beyond the scope of this test guide development program and is not addressed as part of this document EMI test requirements for NASA programs are primarily developed based on the requirements contained in MIL-STD-46 1 D (or earlier revisions of MIL-STD-46 1). The corresponding test method guidelines for the MIL-STD-461 D tests are provided in MIL-STD-462D. These test methods are well documented with the exception of the receiver antenna port susceptibility tests (intermodulation, cross modulation, and rejection of undesired signals) which must be tailored to the specific type of receiver that is being tested. Thus, test methods addressed in this guide consist only of antenna port tests designed to evaluate receiver susceptibility characteristics. MIL-STD-462D should be referred for guidance pertaining to test methods for EMI tests other than the antenna port tests. The scope of this test guide includes: (1) a discussion of generic DS receiver performance characteristics; (2) a summary of S-band TDRSS receiver operation; (3) a discussion of DS receiver EMI susceptibility mechanisms and characteristics; (4) a summary of military standard test guidelines; (5) recommended test approach and methods; and (6) general conclusions and recommendations for future studies in the area of spread spectrum receiver testing. Wheeler, M. L. Marshall Space Flight Center NASA Order H-28506-D...

Author: Don Torrieri
Publisher: Springer
ISBN: 3319140965
Category : Technology & Engineering
Languages : en
Pages : 650

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Book Description
This textbook provides a concise but lucid explanation of the fundamentals of spread-spectrum systems with an emphasis on theoretical principles. The choice of specific topics is tempered by the author’s judgment of their practical significance and interest to both researchers and system designers. Throughout the book, learning is facilitated by many new or streamlined derivations of the classical theory. Problems at the end of each chapter are intended to assist readers in consolidating their knowledge and to provide practice in analytical techniques. This third edition includes new coverage of topics such as CDMA networks, Acquisition and Synchronization in DS-CDMA Cellular Networks, Hopsets for FH-CDMA Ad Hoc Networks, and Implications of Information Theory, as well as updated and revised material on Central Limit Theorem, Power Spectral Density of FH/CPM Complex Envelopes, and Anticipative Adaptive-Array Algorithm for Frequency-Hopping Systems.

Author: Amer A. Hassan
Publisher: Springer Science & Business Media
ISBN: 9780792382652
Category : Technology & Engineering
Languages : en
Pages : 178

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Perspectives in Spread Spectrum brings together studies and recent work on six exciting topics from the spread spectrum arts. The book gives a wide, collective view of trends, ideas, and techniques in the spread spectrum discipline, due to the authors' extensive work on spread spectrum techniques and applications from different vantage points. The inexorable march of electronics towards ever faster, ever smaller, and ever more powerful electronic and optical circuitry has wrought, and will continue to enable, profound changes in the spread spectrum arts, by allowing increasingly complex signalling waveforms and statistical tests to be implemented as the theory beyond spread spectrum continues to evolve. Perspectives in Spread Spectrum is divided into six chapters. The first chapter deals with sequence spreading design. There is not a single metric for design of spreading sequences; rather, the design is ideally tailored to the specific scenario of usage. This chapter delves into recent and very promising synthesis work. The second chapter deals with OFDM techniques. As channels become wider and trans-channel fading (or jamming) becomes frequency selective across the band, OFDM techniques may provide a powerful alternative design perspective. The third chapter is a generalization of the venerable Walsh functions. A new modulation scheme, Geometric Harmonic Modulation, GHM for short, is reviewed and characterized as a form of OFDM. From GHM, a further generalization of the Walsh functions is derived for non-binary signalling. The fourth chapter is concerned with some new and exciting results regarding the follower jammer paradigm. A counter-countermeasure technique is reviewed, notable for its counterintuitive characteristic which can be understood from a simple yet elegant game framework. The fifth chapter recounts some results pertaining to random coding for an optical spread spectrum link. The technique is based on laser speckle statistics and uses a coherent array of spatial light modulators at the transmitter but allows the receiver to be realized as a spatially distributed radiometric and therefore incoherent structure. The sixth and final chapter looks at an important and interesting application of spread spectrum to accurately locate a wideband, ‘bent pipe’, satellite transponder. It is, in a strong sense, an inverted GPS technique. Perspectives in Spread Spectrum serves as an excellent reference and source of ideas for further research, and may be used as a text for advanced courses on the topic.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 119

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This thesis focuses on the performance analysis of hybrid direct sequence/slow frequency hopping (DS/SFH) and hybrid direct sequence/fast frequency hopping (DS/FFH) systems under multi-user interference and Rayleigh fading. First, we analyze the performance of direct sequence spread spectrum (DSSS), slow frequency hopping (SFH) and fast frequency hopping (FFH) systems for varying processing gains under interference environment assuming equal bandwidth constraint with Binary Phase Shift Keying (BPSK) modulation and synchronous system. After thorough literature survey, we show that hybrid DS/FFH systems outperform both SFH and hybrid DS/SFH systems under Rayleigh fading and multi-user interference. Also, both hybrid DS/SFH and hybrid DS/FFH show performance improvement with increasing spreading factor and decreasing number of hopping frequencies.

Author: Drew Bird
Publisher: Que Publishing
ISBN: 9780789728302
Category : Computers
Languages : en
Pages : 804

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Annotation The authoritative solution to passing the Network+ exam! Has CompTIAs Authorized Quality Curriculum (CAQC) stamp of approval. Features exam tips, study strategies, review exercises, case studies, practice exams, ExamGear testing software, and more. This exam certifies that candi20020822s know the layers of the OSI model, can describe the features and functions of network components and have the skills needed to install, configure, and troubleshoot basic networking hardware peripherals and protocols. The Network+ exam, developed by CompTIA, is only two years old but already is held by 50,000 individuals. Readers preparing for this exam will find our Training Guide series to be an indispensiblenbsp;self-study tool. This book is their one-stop shop because of its teaching methodology, the accompanying ExamGear testing software, and Web site support at www.quepublishing.com/certification. Drew Bird(MCNI, MCNE, MCT, MCSE, MCP+I) has been working in the IT industry for over 12 years, instructing for the past five. Drew has completed technical training and consultancy assignments for a wide variety of organizations including the Bank of England, The London Stock Exchange, Iomega and the United Nations. Mike Harwood(MCT, MCSE, A+) has 6+ years experience in IT. As well as training and authoring technical courseware, he currently acts as a system manager for a multi site network and performs consultancy projects for a computer networking company. As a team, they have written Network+ Exam Cram(Coriolis) and Network+ Exam Prep(Coriolis).

Author: Marvin K. Simon
Publisher:
ISBN: 9780881750157
Category : Spread spectrum communications
Languages : en
Pages : 456

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