Theoretical analysis and simulation of a code division multiple access system (CDMA) for secure signal transmission in wideband channels

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dc.contributor.author Berber, Stevan en
dc.date.accessioned 2017-08-02T00:29:06Z en
dc.date.issued 2014 en
dc.identifier.citation Military Technical Courier / Vojnotehnicki glasnik 62(3):37-58 2014 en
dc.identifier.issn 0042-8469 en
dc.identifier.uri http://hdl.handle.net/2292/34680 en
dc.description.abstract Chaotic spreading sequences can increase secrecy and resistance to interception in signal transmission. Chaos-based CDMA systems have been well investigated in the case of flat fading and noise presence in the channel. However, these systems operating in wideband channels, characterized by the frequency selective fading and white Gaussian noise, have not been investigated to the level of understanding their practical applications. This paper presents a detailed mathematical model of a CDMA system based on chaotic spreading sequences. In a theoretical analysis, all signals are represented in the discrete time domain. Using the theory of discrete time stochastic processes, the probability of error expressions are derived in a closed form for a multi-user chaos based CDMA system. For the sake of comparison, the expressions for the probability of error are derived separately for narrowband and wideband channels. The application of the system interleaving technique is investigated in particular, which showed that this technique can substantially improve probability of error in the system. The system is simulated and the findings of the simulation confirmed theoretically expected results. Possible improvements in the probability of bit error due to multipath channel nature, with and without interleavers, are quantified depending on the random delay and the number of users in the system. In the analyzed system, a simplified version of the wideband channel model, proposed for modern wideband wireless networks, is used. en
dc.publisher Ministry of Defence of the Republic of Serbia en
dc.relation.ispartofseries Military Technical Courier / Vojnotehnicki glasnik en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher.Details obtained from http://www.sherpa.ac.uk/romeo/issn/0042-8469/ en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.rights.uri https://creativecommons.org/licenses/by/3.0/rs/ en
dc.title Theoretical analysis and simulation of a code division multiple access system (CDMA) for secure signal transmission in wideband channels en
dc.type Journal Article en
dc.identifier.doi 10.5937/vojtehg62-5487 en
pubs.issue 3 en
pubs.begin-page 37 en
pubs.volume 62 en
dc.description.version VoR - Version of Record en
dc.rights.holder Copyright: The Author en
pubs.end-page 58 en
pubs.publication-status Published en
dc.rights.accessrights http://purl.org/eprint/accessRights/OpenAccess en
pubs.subtype Article en
pubs.elements-id 626141 en
pubs.org-id Engineering en
pubs.org-id Department of Electrical, Computer and Software Engineering en
dc.identifier.eissn 2217-4753 en
pubs.record-created-at-source-date 2017-08-02 en


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https://creativecommons.org/licenses/by/3.0/rs/ Except where otherwise noted, this item's license is described as https://creativecommons.org/licenses/by/3.0/rs/

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