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<p>Voice over Internet Protocol (VoIP) telephony is an emerging technology slowly finding its way into military  applications. It provides several advantages over PSTN but comes short on performance, quality of service and  availability. The purpose of this thesis is to measure the quality of voice in VoIP communications. More specifically it  investigates the effects of wireless channel conditions as well as channel coding and compression on the received  speech quality. Both simulation and experimentation are conducted using Matlab code and Speex software and across  commercial VoIP networks. Simulation shows that fading channel parameters can heavily affect the quality of  received speech. Speech compression results in bit rate gain, but, on the other hand, the signal becomes more sensitive  to errors. The performance of an outdoor wireless network is better than that of an indoor network. The VoIP network  architecture can affect the received speech quality on a long-distance connection.
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<br>Subjects: Electrical engineering; Speech; Digital communications</div>
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Nikolaos, Tiantioukas</div>
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