A Methodology for Deriving VoIP Equipment Impairment Factors for a Mixed NB/WB Context

A. Raja, R. Azad, C. Flanagan, C. Ryan
2008 IEEE transactions on multimedia  
This paper proposes a novel approach to quantifying the quality degradation of Voice over IP (VoIP) telephony in the presence of codec and network-related impairments. This approach differs from the baisc ITU-T E-Model for VoIP quality estimation [1] in that it addresses mixed narrowband/wideband scenarios. It makes novel use of instrumental models and symbolic regression via Genetic Programming (GP) to enable the evolution of degradation models from a modest set of initial parameters. Here, a
more » ... wo-step approach has been used. First, values of impairment factors are derived using WB-PESQ as a reference model. Secondly, a GP based symbolic regression approach has been utilized to automatically evolve the functional form of equipment impairment factors from a set of variables. Very few a priori assumptions are made about the model structure. The effectiveness of the approach is demonstrated by a number of generated models which compare favorably with WB-PESQ and outperform the traditional E-Model in terms of prediction accuracy when compared using WB-PESQ. A significant advantage of the approach is that new models are easily generated to account for continuing evolution of the VoIP standards. Index Terms-E-Model, genetic programming, symbolic regression, PESQ-WB, I e,W B,ef f .
doi:10.1109/tmm.2008.2001359 fatcat:vhkzewdnh5f3jf7tj4r5yggjla