Author: Cheong, Kai-yuen
Title: Enhancements in chaos-based digital communication systems
Degree: M.Phil.
Year: 2003
Subject: Hong Kong Polytechnic University -- Dissertations
Digital communications
Chaotic behavior in systems
Department: Department of Electronic and Information Engineering
Pages: 90 leaves : ill. ; 30 cm
Language: English
Abstract: Use of chaos as a fast and convenient mean to spread the spectrum of a signal has received much attention in communication engineering in the past few years. The advantages of spread-spectrum communications include the robustness against multipath fading, resistance to jamming and high secrecy due to low probability of detection. On the other hand, many problems are there to overcome in chaos communication. They include the synchronization problem for coherent demodulation and the estimation problem due to the random-like property of chaos. Moreover in a spread-spectrum system, the issue of bandwidth efficiency must be considered. For instance, multiple users should be able to use the same frequency band without interfering with each other. This thesis studies the modulation-demodulation methods in chaos communications. The study is centered on the previously proposed chaos-shift-keying (CSK) and differential chaos-shift-keying (DCSK) systems. The thesis includes the study of detection methods of CSK and a multiple access system based on DCSK. Also, an M-ary scheme for chaos communications is proposed. The performances of the digital communication systems in this thesis are measured by their bit error rates (BER). The channel is assumed to be of additive white Gaussian noise (AWGN). Computer simulations are carried out and analyses are given. Overall evaluations are also presented.
Rights: All rights reserved
Access: open access

Files in This Item:
File Description SizeFormat 
b17404083.pdfFor All Users2.35 MBAdobe PDFView/Open

Copyright Undertaking

As a bona fide Library user, I declare that:

  1. I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
  2. I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
  3. I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.

By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.

Show full item record

Please use this identifier to cite or link to this item: