Performance Analysis of Speech Transmission Over Composite Wireless Channels

This study gives an insight into the performance of speech transmission over the state- of-the-art kappa - mu/inverse and eta - mu/inverse gamma composite wireless channels. By approximation, novel expressions for the probability density functions, cumulative distribution functions, and moment-generating functions of these composite channels have been derived in the form of finite series summations. The comparative results are simple to implement, as well as, it eliminates the constraints of the integer value of inverse gamma parameter present in the existing expressions of moment-generating functions in literature. The system performance has been evaluated as average symbol error rate and outage probability. On the other hand, speech signals from the Texas Instruments/Massachusetts Institute of Technology database have been considered for transmission over the derived composite channels. The quality of the received speech signals has been analyzed as a measure of perceptual evaluation of speech quality, short-time objective intelligibility, and segmental signal to noise ratio for different received signal to noise ratios.