Performance evaluation of VoIP over WLAN networks using Weibull distribution for canal emulation

Authors:
Omar Carvalho Branquinho;Alessandra Bussolin Bandeira;Fernando Lino;Adriano Almeida Góes;Norma Reggiani
Affiliations:
Pontifícia Universidade Católica de Campinas -- SP;Pontifícia Universidade Católica de Campinas -- SP;Pontifícia Universidade Católica de Campinas -- SP;Pontifícia Universidade Católica de Campinas -- SP;Pontifícia Universidade Católica de Campinas -- SP
Venue:
EATIS '07 Proceedings of the 2007 Euro American conference on Telematics and information systems
Year:
2007

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Abstract

This article investigates VoIP performance over WLAN (WVoIP) through qualitative and quantitative point of view, considering degradation with the mobility. The results was obtained through a channel emulator to produce the Weibull distribution. Measurements results with a robot showed that this distribution is adequate to represent WLAN environment instability. The test utilized the CODECs G711 and GSM. The article presents preliminary results that indicate the effect of the instability of wireless environment in the VoIP performance. The results indicate a significant variation of voice quality, considering the severity of the phenomena emulated. The behaviors of the CODECs are evaluated considering the different characteristics of bandwidth and robustness.