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Parametric Prediction Model for Perceived Voice Quality in Secure VoIP
Linköpings universitet, Institutionen för systemteknik, Informationskodning.
2016 (Engelska)Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)Alternativ titel
Parameter Baserad Prediktionsmodell för Upplevd Talkvalité i Säker VoIP trafik (Svenska)
Abstract [en]

More and more sensitive information is communicated digitally and with thatcomes the demand for security and privacy on the services being used. An accurateQoS metric for these services are of interest both for the customer and theservice provider. This thesis has investigated the impact of different parameterson the perceived voice quality for encrypted VoIP using a PESQ score as referencevalue. Based on this investigation a parametric prediction model has been developedwhich outputs a R-value, comparable to that of the widely used E-modelfrom ITU. This thesis can further be seen as a template for how to construct modelsof other equipments or codecs than those evaluated here since they effect theresult but are hard to parametrise.

The results of the investigation are consistent with previous studies regarding theimpact of packet loss, the impact of jitter is shown to be significant over 40 ms.The results from three different packetizers are presented which illustrates theneed to take such aspects into consideration when constructing a model to predictvoice quality. The model derived from the investigation performs well withno mean error and a standard deviation of the error of a mere 1:45 R-value unitswhen validated in conditions to be expected in GSM networks. When validatedagainst an emulated 3G network the standard deviation is even lower.v

Ort, förlag, år, upplaga, sidor
2016.
Nyckelord [en]
VoIP, QoS, Parametric model, Encryption
Nationell ämneskategori
Kommunikationssystem
Identifikatorer
URN: urn:nbn:se:liu:diva-127402ISRN: LiTH-ISY-EX--16/4940--SEOAI: oai:DiVA.org:liu-127402DiVA: diva2:934326
Externt samarbete
Sectra Communications AB
Ämne / kurs
Examensarbete i Informationskodning
Presentation
2016-05-31, 13:15 (Engelska)
Tillgänglig från: 2016-06-08 Skapad: 2016-04-26 Senast uppdaterad: 2016-06-08Bibliografiskt granskad

Open Access i DiVA

Thesis_Martin_Andersson(1239 kB)128 nedladdningar
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Typ fulltextMimetyp application/pdf

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http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-127402
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