Author: Farnoosh BahramPublisher:
ISBN:
Category :
Languages : en
Pages : 62
Book Description
Effects of Pulse Shape on Performance of Direct Sequence Spread Spectrum Multiple Access Communication Systems
Author: Farnoosh BahramThe Performance of Direct-sequence Spread-spectrum Multiple-access Systems Including Jamming and Partial Code Correlation Effects
Author: Nersi NazariMultiple Access Interference Characterization for Direct-Sequence Spread-Spectrum Communications Using Chip Waveform Shaping
Author: Matthew G. GlenPublisher:
ISBN: 9781423519928
Category : Coding theory
Languages : en
Pages : 78
Book Description
This research characterizes MAI effects on DS/SSMA system performance through simulation in Matlab , and explores the impact of multiple access code selection, chip waveform shaping, and multiple access code length on BER for both synchronous and asynchronous multiple access networks. In addition, the simulated DS/SSMA model permits rapid research into the effects of additional factors on BER. Prior to experimental testing, model validation is conducted through single user trials and by comparison with existing research for similar system designs. For synchronous and asynchronous networks, Gold coding improves BER by 7.5 and 4.0 dB, respectively, relative to aperiodic random spreading codes. Synchronous network results show that chip waveform shaping provides no significant BER improvement for the Blackman or Lanczos shapes. However, asynchronous network results show a potential BER improvement for Blackman and Lanczos shapes. Increasing code length from 31 to 511 resulted in a 7.5 dB BER improvement. Collectively, these results directly relate changes in BER to waveform cross-correlation statistics.
Perspectives in Spread Spectrum
Author: Amer A. HassanPublisher: Springer Science & Business Media
ISBN: 9780792382652
Category : Technology & Engineering
Languages : en
Pages : 178
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.
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
Spread Spectrum Communications
Author: Marvin K. SimonPublisher:
ISBN: 9780881750157
Category : Spread spectrum communications
Languages : en
Pages : 456
Book Description
Spread Spectrum Techniques
Author: Robert C. DixonPublisher:
ISBN: 9780471023593
Category :
Languages : en
Pages : 408
Book Description
Performance of Direct Sequence Modualted Spread Spectrum Multiple Access Communication Systems in a Ra[y]leigh Fading Environment
![Performance of Direct Sequence Modualted Spread Spectrum Multiple Access Communication Systems in a Ra[y]leigh Fading Environment PDF](https://books.google.com/books/content/images/frontcover/ILo8ywAACAAJ?fife=w80-h100)
Author: Gerald Anthony WelchPartial Correlation Effects in Direct-Sequence Spread-Spectrum Multiple-Access Communication Systems
Author: D. V. SarwateChip Waveform Selection in Offset-quaternary Direct-sequence Spread-spectrum Multiple-access Communications
Author: James Stanley LehnertPublisher:
ISBN:
Category :
Languages : en
Pages : 90
Book Description
An offset-quaternary direct-sequence spread-spectrum multiple-access communication system is analyzed. This analysis considers the effect of the choice of chip waveforms on the bandwidth which the system utilizes, the signal-to-noise ratio at each user's receiver, and the constant-envelope character of the transmitted signals. (Author).