Performance Study Of Hybrid Spread Spectrum Techniques
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Performance Study Of Hybrid Spread Spectrum Techniques
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Author :
language : en
Publisher:
Release Date : 2005
Performance Study Of Hybrid Spread Spectrum Techniques written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
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.
Enhancing The Performance Of Spread Spectrum Techniques In Different Applications
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Author : Omar Abdel-Gaber Mohamed Aly
language : en
Publisher:
Release Date : 2006
Enhancing The Performance Of Spread Spectrum Techniques In Different Applications written by Omar Abdel-Gaber Mohamed Aly and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
Multi Carrier And Spread Spectrum Systems
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Author : K. Fazel
language : en
Publisher: John Wiley & Sons
Release Date : 2004-02-06
Multi Carrier And Spread Spectrum Systems written by K. Fazel and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004-02-06 with Technology & Engineering categories.
Frequency spectrum is a limited and valuable resource for wireless communications. A good example can be observed among network operators in Europe for the prices to pay for UMTS-frequency bands. Therefore, the first goal when designing future wireless communication systems (e.g. 4G - fourth generation) has to be the increase in spectral efficiency. The development in digital communications in the past years has enabled efficient modulation and coding techniques for robust and spectral efficient data, speech, audio and video transmission. These are the multi-carrier modulation (e.g. OFDM) and the spread spectrum technique (e.g. DS-CDMA), where OFDM was chosen for broadcast applications (DVB, DAB) as well as for broadband wireless indoor standards (ETSI HIPERLAN-II, IEEE-802.11) and the DS-CDMA was selected in mobile communications (IS-95, third generation mobile radio systems world wide, UMTS/IMT 2000). Since 1993 various combinations of multi-carrier (MC) modulation and the spread spectrum (SS) technique have been introduced and the field of MC-SS communications has become an independent and important research topic with increasing activities. New application fields have been proposed such as high rate cellular mobile, high rate wireless indoor and LMDS. It has been shown that MC-SS offers the high spectral efficiency, robustness and flexibility that is required for the next generation systems. Meanwhile, different alternative hybrid schemes such as OFDM/OFDMA, MC-TDMA, etc. have been deeply analysed and adopted in different international standards (ETSI-BRAN, IEEE-802 & MMAC). Multi-Carrier & Spread-Spectrum: Analysis of Hybrid Air Interfaces draws together all of the above mentioned hybrid schemes therefore providing a greatly needed resource for system engineers, telecommunication designers and researchers in order to enable them to develop, build and deploy several schemes based on MC-transmission for the next generation systems (which will be an integration of broadband multimedia services covering both 4G mobile and fixed wireless systems). * Offers a complete treatment of multi-carrier, spread-spectrum (SS) and time division multiplexing (TDM) techniques * Provides an in-depth insight into hybrid multiple access techniques based on multi-carrier (MC) transmission * Presents numerous hybrid multiple access and air interface architectures including OFDM/CDMA, MC-CDMA, MC-DS-CDMA and MT-CDMA * Covers new techniques such as space-time coding and software radio Telecommunications engineers, hardware & software system designers and researchers as well as students, lecturers and technicians will all find this an invaluable addition to their bookshelf.
Perspectives In Spread Spectrum
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Author : Amer A. Hassan
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Perspectives In Spread Spectrum written by Amer A. Hassan and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Technology & Engineering categories.
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.
Fundamentals Of Spread Spectrum Modulation
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Author : Rodger E. Ziemer
language : en
Publisher: Morgan & Claypool Publishers
Release Date : 2007
Fundamentals Of Spread Spectrum Modulation written by Rodger E. Ziemer and has been published by Morgan & Claypool Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Digital modulation categories.
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. For more complete treatments of spread spectrum, the reader is referred to [1, 2, 3].
Performance Analysis Of Both Hybrid And Frequency Hopped Phase Coherent Spread Spectrum Systems
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Author : Giovanni Cherubini
language : en
Publisher:
Release Date : 1986
Performance Analysis Of Both Hybrid And Frequency Hopped Phase Coherent Spread Spectrum Systems written by Giovanni Cherubini and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Frequency stability categories.
A Performance Comparison Of Direct Sequence And Frequency Hopping Spread Spectrum Systems
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Author : Mahasen Kamaal Hussein
language : en
Publisher:
Release Date : 1985
A Performance Comparison Of Direct Sequence And Frequency Hopping Spread Spectrum Systems written by Mahasen Kamaal Hussein and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Spread spectrum communications categories.
Spread Spectrum Systems
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Author : Robert Clyde Dixon
language : en
Publisher: Wiley-Interscience
Release Date : 1984
Spread Spectrum Systems written by Robert Clyde Dixon and has been published by Wiley-Interscience this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Science categories.
Spread Spectrum Techniques
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Author : Robert Clyde Dixon
language : en
Publisher:
Release Date : 1976
Spread Spectrum Techniques written by Robert Clyde Dixon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Electronics categories.
Study Of Spread Spectrum Techniques For Tt C
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Author : O. Bätz
language : en
Publisher:
Release Date : 1990
Study Of Spread Spectrum Techniques For Tt C written by O. Bätz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.