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Examination of acousto-optic chaos and application to RF signal encryption and recovery

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Title: Examination of acousto-optic chaos and application to RF signal encryption and recovery
Authors: Al-saedi, Mohammed A.
Source: Graduate Theses and Dissertations
Publisher Information: eCommons
Publication Year: 2012
Collection: University of Dayton: eCommons
Subject Terms: Data encryption (Computer science) Research, Chaotic behavior in systems Research, Acoustooptics Security measures Research, Signal processing Digital techniques, Signal processing Data processing, Signal processing Research
Description: In communication systems, there are different coding schemes such as linear predictive coding, block coding, and veterbi coding that can be used to encode data for different purposes. One of the techniques to encode/encrypt data for security purposes is to use chaos. Chaotic systems can be manipulated, via arbitrarily small time-dependent perturbations, to generate controlled chaotic orbits whose symbolic representation corresponds to the encoding of a desirable message. An advantage of this type of communication strategy is that the nonlinear chaotic oscillator that generates the wave form for transmission can remain simple and efficient, while all the necessary electronics controlling encoding of the signal remain at the low-powered microelectronic level. Moreover, since the chaotic dynamics can be recovered from a chaotic signal, which in principle can be noisy, by using standard dynamical data analysis techniques, communicating with chaos is also more robust and better behaved against channel noise. Signal encryption and recovery using chaotic optical waves has been a subject of active research in the past 10 years. Since an acousto-optic Bragg cell with zeroth- and first-order feedback exhibits chaotic behavior past the threshold for bistability, such a system was examined for possible chaotic encryption using a low-amplitude sinusoidal signal applied via the bias input of the sound cell driver. Subsequent recovery of the message signal was carried out via a heterodyne strategy employing a locally generated chaotic carrier, with threshold parameters matched to the transmitting Bragg cell. The simulation results, though encouraging and extend to the following (i) increasing the chaos frequency using appropriate parameter control; (ii) carefully examining the system sensitivity to three system parameters, viz., feedback delay, feedback gain, and dc bias level; (iii) examine signal recoverability relative to shifts in the three parameters mentioned above relative to the transmitter; and (iv) determining the ...
Document Type: text
Language: unknown
ISBN: 978-1-337-80895-8
1-337-80895-4
Relation: https://ecommons.udayton.edu/graduate_theses/487; http://rave.ohiolink.edu/etdc/view?acc_num=dayton1337808954
Availability: https://ecommons.udayton.edu/graduate_theses/487
http://rave.ohiolink.edu/etdc/view?acc_num=dayton1337808954
Rights: Copyright © 2012, author
Accession Number: edsbas.2AAC9499
Database: BASE
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  – Url: https://ecommons.udayton.edu/graduate_theses/487#
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  Data: Examination of acousto-optic chaos and application to RF signal encryption and recovery
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  Data: <searchLink fieldCode="AR" term="%22Al-saedi%2C+Mohammed+A%2E%22">Al-saedi, Mohammed A.</searchLink>
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  Data: Graduate Theses and Dissertations
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  Data: 2012
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  Data: University of Dayton: eCommons
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  Data: <searchLink fieldCode="DE" term="%22Data+encryption+%28Computer+science%29+Research%22">Data encryption (Computer science) Research</searchLink><br /><searchLink fieldCode="DE" term="%22Chaotic+behavior+in+systems+Research%22">Chaotic behavior in systems Research</searchLink><br /><searchLink fieldCode="DE" term="%22Acoustooptics+Security+measures+Research%22">Acoustooptics Security measures Research</searchLink><br /><searchLink fieldCode="DE" term="%22Signal+processing+Digital+techniques%22">Signal processing Digital techniques</searchLink><br /><searchLink fieldCode="DE" term="%22Signal+processing+Data+processing%22">Signal processing Data processing</searchLink><br /><searchLink fieldCode="DE" term="%22Signal+processing+Research%22">Signal processing Research</searchLink>
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  Label: Description
  Group: Ab
  Data: In communication systems, there are different coding schemes such as linear predictive coding, block coding, and veterbi coding that can be used to encode data for different purposes. One of the techniques to encode/encrypt data for security purposes is to use chaos. Chaotic systems can be manipulated, via arbitrarily small time-dependent perturbations, to generate controlled chaotic orbits whose symbolic representation corresponds to the encoding of a desirable message. An advantage of this type of communication strategy is that the nonlinear chaotic oscillator that generates the wave form for transmission can remain simple and efficient, while all the necessary electronics controlling encoding of the signal remain at the low-powered microelectronic level. Moreover, since the chaotic dynamics can be recovered from a chaotic signal, which in principle can be noisy, by using standard dynamical data analysis techniques, communicating with chaos is also more robust and better behaved against channel noise. Signal encryption and recovery using chaotic optical waves has been a subject of active research in the past 10 years. Since an acousto-optic Bragg cell with zeroth- and first-order feedback exhibits chaotic behavior past the threshold for bistability, such a system was examined for possible chaotic encryption using a low-amplitude sinusoidal signal applied via the bias input of the sound cell driver. Subsequent recovery of the message signal was carried out via a heterodyne strategy employing a locally generated chaotic carrier, with threshold parameters matched to the transmitting Bragg cell. The simulation results, though encouraging and extend to the following (i) increasing the chaos frequency using appropriate parameter control; (ii) carefully examining the system sensitivity to three system parameters, viz., feedback delay, feedback gain, and dc bias level; (iii) examine signal recoverability relative to shifts in the three parameters mentioned above relative to the transmitter; and (iv) determining the ...
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      – SubjectFull: Chaotic behavior in systems Research
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      – SubjectFull: Acoustooptics Security measures Research
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