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Evaluating the Impact of Noise and QoS Parameters on Satisfaction (QoE) of VoIP Users

Fathi, Parshang | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52678 (19)
  4. University: Sharif University of Technology
  5. Department: Computer Engineering
  6. Advisor(s): Jahangir, Amir Hossein
  7. Abstract:
  8. Today, users can easily access network and Internet services from anywhere, anytime, using mobile computing devices, such as laptops, tablets, smartphones, and so forth This trend has diversified users and their need for network protocol-based services, including VoIP. VoIP is an Internet protocol for voice transmission and reception, which has become one of the biggest challenges in today's world of communications and telecommunications. Analyzing and evaluating the quality of network service (QoS) in VoIP traffic is an essential part of the process of ensuring and improving the quality of multimedia networks. Therefore, monitoring and measuring "users’ satisfaction" toward voice communication (also called QoE "Quality of Experience") is very important. Therefore, evaluating the impact of different factors and their implications for VoIP is required by distributors and consumers of multimedia content on the network platform in order to meet the expectations of users and reduce the number of resources consumed. The low quality of voice transmission can lead to users' dissatisfaction so that users leave the service and join another. In this research, we aim to improve the quality of VoIP by evaluating the effect of different network and signal parameters on the quality of user experience using a monitoring system. In fact, by objectively measuring the parameters affecting the VoIP quality, QoE values are calculated and evaluated based on common methods (such as PESQ), and the influence of different network and signal factors on the quality of user experience is observed. Network parameters and audio signals including CODEC type, sending rate, packet loss rate, delay, and jitter are considered in this evaluation. Also, signal impact includes adding noise to a sound file (audio signal) to consider the effect of noise on the reduction of VoIP voice and speech quality. It is also estimated using reference audio files and comparing reported values, satisfaction, and experience quality with actual user feedback.The results of the observations and practical experience show that the relationship between the main parameters of network service quality (QoS) such as packet loss rate, latency, delay fluctuation and codec type has a direct impact on user satisfaction and in addition, the signal-to-noise ratio, especially when severe ambient noise (such as 0db, 5db, and 10db signal to noise ratio) greatly affects the quality of user satisfaction
  9. Keywords:
  10. Service Quality ; Voice Over Internet Protocol (VOIP) ; Experience Quality ; User Satisfaction

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