An E-Model Implementation for Speech Quality Evaluation in VoIP Systems
ISCC '05 Proceedings of the 10th IEEE Symposium on Computers and Communications
ICASSP '01 Proceedings of the Acoustics, Speech, and Signal Processing, 200. on IEEE International Conference - Volume 02
Improving Quality of VoIP Streams over WiMax
IEEE Transactions on Computers
On the evaluation of the conversational speech quality in telecommunications
EURASIP Journal on Advances in Signal Processing
Experimental Study of Voice over IP Services over Broadband Wireless Networks
AINA '08 Proceedings of the 22nd International Conference on Advanced Information Networking and Applications
Jitter-Buffer Management for VoIP over Wireless LAN in a Limited Resource Device
ICNS '08 Proceedings of the Fourth International Conference on Networking and Services
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The Voice over Internet Protocol (VoIP) services are currently present in our personal and professional activities and will be key services in Next Generation Networks (NGN). Hence, in order to keep and attract new customers, the quality of delivery for VoIP services needs to be measured and optimized to ensure Quality of Service (QoS) and Quality of Experience (QoE) support to users in future multimedia networking systems. This paper presents the requirements to assess the quality level of VoIP services in NGN and analyzes the limitations of the well-known E-Model and Perceptual Evaluation of Speech Quality (PESQ) metrics for quality evaluation of VoIP services. Additionally, a new QoE metric, named Advanced Model for Perceptual Evaluation of Speech Quality (AdmPESQ), is proposed to overcome the limitations of current proposals concerning packet loss and packet delay awareness and to improve the VoIP assessment process. Performance evaluation was carried out based on simulation experiments to show the benefits of AdmPESQ in assessing the impact of VoIP services on the user's expectation.