Dissertation > Excellent graduate degree dissertation topics show

Chaos DS technology research and its applications in covert channel

Author: DongShanShan
Tutor: ZhouNing
School: University of Electronic Science and Technology
Course: Communication and Information System
Keywords: Spread Spectrum Communication Chaos Logistic Mapping Software Radio Secret Channel
CLC: TN914.42
Type: Master's thesis
Year: 2008
Downloads: 85
Quote: 1
Read: Download Dissertation

Abstract


Spread Spectrum Communication is the principal technology in the military communication.Possessing the strong ability of anti-jamming, anti-fading, anti-interception as well as low spectral density,direct sequence spread spectrum(DSSS) is widely used in the modern military field.The spreading code with good randomicity and correlation have a decisive effect on the performance of communication system.The discovery of chaotic dynamic system broad the way of study of PN sequence.Chaos is a convinced and random kind course that appears in the nonlinear system.It is an unperiod and an irregular course.It is not convergence but dose have a bound,while it is sensitive to its initial value.For all these special performance,chaos has an excellent outlook in the application of telecommunication,especially in the generation of PN sequence.In this paper, we have a deep discuss in DS-SS system, analysis the structure of the system, then we come to PN sequence used in DS-SS system and introduce chaos to the study of PN sequence. Taking Logistic sequence as representation, we analysis its randomicity, correlation and linear complexity,and how to obtain binary sequence. Aiming at the characteristic of DS-SS system, some criteria on optimizing spreading sequences are proposed. The method of choosing is also presented. According to the method, chaotic spreading sequences with better performance are obtained. The FPGA implementation scheme of IF software radio is researched. Based on the scheme, the universal hardware platform of IF software radio is designed and implemented.At the same time, we are trying to seek a method of designing secret channel in DS-SS communication system, and analysis its performance. The original symbol in the secret channel is firstly spread by a short PN code, and then part of the long used in the basic channel. As a result, the secret channel would present excellent anti-interception performance.

Related Dissertations

  1. Research on synchronization control of chaotic systems,O415.5
  2. The Research of Chaos M-ary Modulation and Demodulation Method Based on Chaotic Oscillator,TN915.05
  3. With Delay fishing items and based on the ratio of prey - predator model,O175
  4. The Comprehensive Optimization of Hydrodynamic Performance and Structural Characteristics for a High-speed Ship,U661.3
  5. Research on Limit-Factors in IC Design-Tool Application,TN402
  6. Study of Chaos and Its Control in the DC-DC Converters,TM46
  7. Development of a multi- speed radar measurement system answering machine,V556
  8. Two Algorithms for Image Processing Based on Chaos and Fractal,TP391.41
  9. An Improved Method for Short-term Load Forecasting Based on FFT and Chaos,TM715
  10. Register-based chaotic secure communication and Noise Analysis,TN918
  11. Subspace-based analysis of Narrowband Interference Suppression in Spread Spectrum Communications,TN914.42
  12. Spread spectrum communication system command synchronization of pseudo-code,TN914.42
  13. Digital T / R combination of Automatic Test System Design and Implementation,TN957
  14. Robot obstacle avoidance algorithm,TP242
  15. Research on Adaptive Narrowband Suppression Techniques in Spread Spectrum Communication Systems,TN914.42
  16. Hopf Bifurcation and Generalized Synchronization of the Delayed Coupled Lorenz-Rossler Systems,O157.5
  17. Hopf bifurcation and chaos in biological systems,O175
  18. Hopf bifurcation and chaos control of a class with Delay Lotka-Volterra system,O175
  19. Numerical Study of Stochastic Supersensitiviy of Generalized Burgers Equation,O241
  20. Study on Optimization Modeling and Intelligent Control of Alcohol-based Fuel Boiler Combustion System,TK223.2
  21. Communist leaders and the West Army issues order out of chaos,D231

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication systems ( transmission system) > Frequency hopping spread spectrum communication system > Spread spectrum communication
© 2012 www.DissertationTopic.Net  Mobile