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Nonlinear observer-based synchronization of chaotic systems with application to secure communications.

機(jī)譯：混沌系統(tǒng)基于非線性觀測(cè)器的同步及其在安全通信中的應(yīng)用。

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摘要

Due to sensitive dependence on initial conditions, it is practically impossible to repeat the same signal generated by chaotic system. However, it has been shown that two chaotic systems (a drive and a response system) can exhibit synchronous chaotic behavior if adequately “coupled.”; In this dissertation, a more general framework for synchronization of chaotic systems is proposed. Instead of using the exact copy of the drive system as the response system, we make use of nonlinear state observer design methods in state reconstruction of chaotic systems. We show that synchronization of chaotic systems can be effectively achieved by using any of the proposed methods. The issue of robustness of synchronized chaotic oscillators with respect to noise is also addressed.; Unlike periodic carriers, chaotic signals are commonly characterized by quite broad power spectra. This property, together with sensitive dependence on initial conditions make chaotic systems attractive for application in secure communications since an information-bearing message can be hidden within a complicated structure of a chaotic carrier. Various estimator methods are applied to introduce a means to secure communications by chaotic masking and chaotic modulation, where the information signal is injected into the chaotic signal to be simultaneously transmitted to the receiver.
機(jī)譯：由于對(duì)初始條件的敏感依賴性，實(shí)際上不可能重復(fù)由混沌系統(tǒng)生成的相同信號(hào)。但是，已經(jīng)表明，如果適當(dāng)?shù)亍榜詈稀?，則兩個(gè)混沌系統(tǒng)（驅(qū)動(dòng)器和響應(yīng)系統(tǒng)）可以表現(xiàn)出同步混沌行為。本文提出了一種更通用的混沌系統(tǒng)同步框架。我們沒(méi)有使用驅(qū)動(dòng)系統(tǒng)的精確副本作為響應(yīng)系統(tǒng)，而是在混沌系統(tǒng)的狀態(tài)重構(gòu)中使用了非線性狀態(tài)觀測(cè)器設(shè)計(jì)方法。我們表明，通過(guò)使用任何建議的方法可以有效地實(shí)現(xiàn)混沌系統(tǒng)的同步。還解決了同步混沌振蕩器相對(duì)于噪聲的魯棒性問(wèn)題。與周期性載波不同，混沌信號(hào)通常具有相當(dāng)寬的功率譜。這種特性，加上對(duì)初始條件的敏感依賴性，使得混沌系統(tǒng)對(duì)于安全通信具有吸引力，因?yàn)榭梢詫⑿畔⒊休d消息隱藏在復(fù)雜的混沌載體結(jié)構(gòu)中。應(yīng)用各種估計(jì)器方法來(lái)引入一種通過(guò)混沌掩蔽和混沌調(diào)制來(lái)確保通信安全的手段，其中信息信號(hào)被注入到混沌信號(hào)中以同時(shí)發(fā)送到接收器。

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  • 作者

    Amirazodi, Javid.;

  • 作者單位

    University of Arkansas.;

  • 授予單位 University of Arkansas.;
  • 學(xué)科 Engineering Electronics and Electrical.
  • 學(xué)位 Ph.D.
  • 年度 2001
  • 頁(yè)碼 150 p.
  • 總頁(yè)數(shù) 150
  • 原文格式 PDF
  • 正文語(yǔ)種 eng
  • 中圖分類 無(wú)線電電子學(xué)、電信技術(shù);
  • 關(guān)鍵詞

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