Author: Evaggelos A. GeraniotisPublisher:
ISBN:
Category :
Languages : en
Pages : 136
Book Description
Analysis of Binary Frequency-hopped Spread-spectrum Multiple-access Communications Systems
Author: Evaggelos A. GeraniotisPublisher:
ISBN:
Category :
Languages : en
Pages : 136
Book Description
Multiple-Access Capability of Frequency-Hopped Spread-Spectrum Revisited: An Exact Analysis of the Effect of Unequal Power Levels
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 49
Book Description
In this paper we present a new method for the evaluation of the probability of error of uncoded frequency-hopped spread-spectrum multiple-access (FH/SSMA) communications. For systems with binary FSK modulation the method provides an accurate approximation and a tight upper bound to the bit error probability; for systems with M-ary FSK modulation it provides tight upper bounds to the symbol error probability. This method relies on the integration of the product of the characteristic function of the envelope of the branch of the BFSK demodulator, which carries the desired signal, and of the derivative of the characteristic function of the envelope of the other branch; it can achieve any desirable accuracy and the computational effort required for its evaluation grows linearly with the number of interfering users. In the M-ary case tight upper bounds based on the union bound and the results of the binary case are derived.
Spread Spectrum Communications Handbook, Electronic Edition
Author: Marvin K. SimonPublisher: McGraw Hill Professional
ISBN: 0071395709
Category : Technology & Engineering
Languages : en
Pages : 1250
Book Description
The acknowledged Spread-Spectrum Bible the most complete reference in the field! INCLUDESCD-ROM CONTAININGTHE ENTIRE BOOKIN FULLY-SEARCHABLE PDF Spread-spectrum systems have found important commercial applications in CDMA cellular networks and wireless personal communication networks. Communications engineers and technicians now have ready access to a wealth of spread-spectrum information in this exhaustive handbook the most comprehensive and authoritative compendium on spread-spectrum systems available anywhere. Written by recognized authorities in the field, the Handbook presents both theoretical basics and practical applications, providing succinct, results-oriented solutions to engineering problems. Starting with basic concepts and system models, the book covers: Anti-jamming communication systems Coherent direct-sequence systems Non-coherent frequency-hopped systems Coherent and differentially coherent modulation techniques Pseudonoise acquistion and tracking in direct sequence receivers Time and frequency synchronization of frequency-hopped receivers Low probability of intercept communications In addition, it offers an in-depth look at multiple access communications and positioning systems and discusses the growth of spread-spectrum applications. INCLUDES CD-ROM CONTAINING THE ENTIRE BOOK IN FULLY SEARCHABLE PDF
Frequency-Hopped Spread-Spectrum Systems Have a Larger Multiple-Access Capability: The Effect of Interfering Signals with Unequal Power Levels
Author: Evaggelos GeraniotisPublisher:
ISBN:
Category :
Languages : en
Pages : 48
Book Description
In this report we present a new method for the evaluation of the probability of error of uncoded frequency-hopped spread-spectrum multiple-access (FH/SSMA) communications. For systems with binary FSK modulation, the method provides an accurate approximation and a tight upper bound to the bit error probability; for systems with M -ary FSK modulation, it provides tight upper bounds to the symbol error probability. This method relies on the integration of the product of the characteristic function of the envelope of the branch of the BFSK demodulator, which carries the desired signal, and of the derivative of the characteristic function of the envelope of the other branch; it can achieve any desirable accuracy and the computational effort required for its evaluation grows linearly with the number of interfering users. In the M -ary case, tight upper bounds based on the union bound and the results of the binary case are derived. Keywords: Frequency hopping, Spread spectrum, Multiple access, and Error control coding. (RH).
Perspectives in Spread Spectrum
Author: Amer A. HassanPublisher: Springer Science & Business Media
ISBN: 1461555310
Category : Technology & Engineering
Languages : en
Pages : 170
Book Description
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.
A Study of Binary Sequences for Direct-Sequence Spread-Spectrum Multiple-Access Communication Systems
Author: 陳子健Publisher: Open Dissertation Press
ISBN: 9781374735590
Category :
Languages : en
Pages :
Book Description
This dissertation, "A Study of Binary Sequences for Direct-sequence Spread-spectrum Multiple-access Communication Systems" by 陳子健, Chi-kin, John Baptist, Chan, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b3121276 Subjects: Spread spectrum communications
Performance Analysis of Frequency Hopped Spread Spectrum Multiple Access (FH-SSMA) Communication Systems
Author: Khalid Ali Qaraq'eSpread Spectrum Communications
Author: Marvin K. SimonPublisher:
ISBN: 9780881750157
Category : Spread spectrum communications
Languages : en
Pages : 456
Book Description
Noncoherent Hybrid DS-SFH Spread-Spectrum Multiple-Access Communications
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 38
Book Description
The performance of noncoherent reception in synchronous and asynchronous hybrid direct- sequence/slow-frequency-hopped spread-spectrum multiple-access communication systems operating through additive white Gaussian noise channels is investigated. Systems with binary and Mar-y frequency-shift-keying modulation and noncoherent demodulation, as well as systems with differential-phase-shift keying modulation and differentially coherent demodulation are examined and their probability of error is evaluated for random frequency-hopping patterns and signature sequences. The multiple-access capability of noncoherent hybrid spread-spectrum is shown to be superior to that of noncoherent purely frequency-hopped spread-spectrum and inferior to that of non- coherent purely direct-sequence spread-spectrum for systems with the same bandwidth expansion. Comparison of hybrid systems with coherent and noncoherent demodulation shows a considerable loss in the performance of the noncoherent systems.
Author: Ki Jong Hong