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Audio quality perception of SCIP encrypted voice transmission over low quality radio links
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
2016 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Tactical radio communications used in military applications hasstrict requirements regarding security and has to be operable inrough environments in which there may be disturbances and disruptionson a radio link. The performance of the Secure CommunicationInteroperability Protocol (SCIP) operating in an asynchronouscommunication network with various levels of packet loss isinvestigated and found inadequate mainly due to problems withcryptographic synchronization between the transmitting and receivingunits. The introduction of additional counter data to each datapacket remedies this problem and allows the receiving units to fillthe holes left by packet losses with filler packets, maintainingsynchronization. The audio quality can then be measured using thePerceptual Evaluation of Speech Quality (PESQ) algorithm.Measurements are performed in an emulated radio link with aconfigurable packet loss ratio developed by Saab. The results showthat parts of SCIP can be used alongside the counter solution withoutimpacting the audio quality. The insertion of filler packets is shownto have a positive effect on the audio quality, while aggregation ofpackets to conserve transmission data rate is shown to have anegative effect.

Place, publisher, year, edition, pages
2016. , 33 p.
UPTEC F, ISSN 1401-5757 ; 16039
Keyword [en]
SCIP, audio quality perception, packet loss, PESQ
National Category
Communication Systems
URN: urn:nbn:se:uu:diva-298312OAI: diva2:945610
External cooperation
Saab AB
Educational program
Master Programme in Engineering Physics
Available from: 2016-07-04 Created: 2016-07-01 Last updated: 2016-07-04Bibliographically approved

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