Application of SPC in perceptual speech quality control in modern mobile radio networks

[Truncated abstract] One of the important aspects of a mobile communications industry is satisfying customers' needs most economically. Indeed, customers expect good and consistent quality of service from the provider. As such, in mobile telephony, this amounts to controlling speech quality as "perceived" by customers. Controlling perceptual speech quality necessitates a reliable measurement of the quality first, followed by exercising direct control over it. The ultimate measure of perceived speech quality is realized through subjective listening tests, but this is not practical for real-time day to day applications. In recent years, objective quality measurement algorithms have been developed to predict the subjective quality with considerable accuracy. And the ITU-T P.862 Perceptual Evaluation of Speech Quality (PESQ) model is state of the art in the International Telecommunication Union's Telecommunication Standardization Sector (ITU-T) recommendation for reference objective quality measurement method. However, these algorithms have yet to be applied for end user quality control in cellular networks. Hence, in this thesis, the research framework for application of the PESQ algorithm for perceptual speech quality control is presented.