Abstract—Alamouti’s space time block coding (STBC) and maximal ratio combining (MRC) scheme is considered on audio signal transmission to investigate the effect of antenna diversity on the system performance. The FEC encoded Alamouti-MRC transmission system under investigation deploys various multi-level digital modulations (16-PSK and 16-QAM) techniques over an Additive White Gaussian Noise (AWGN) and Correlated Rayleigh Fading Channels. Rayleigh channel correlation parameter ρ is varied from 0 to 0.9. Correlation in fading across multiple diversity channels results in a degradation of the system performance. It has been observed from the study that in case of without receive antenna diversity and the correlation parameter ρ=0.9 the system shows comparatively worst performance in 16-PSK scheme and satisfactory performance in 16-QAM. It
is obvious that the system performance is improved with increase in number of receive antennas. The performance analysis shows that with implemented Alamouti-MRC scheme under 16-QAM digital modulation, the system provides excellent performance over a significant low signal
to noise ratio (SNR) values.

Index Terms—MRC, Correlated Rayleigh Fading, STBC

Cite: Tanvir Ahmed and Md. Mortuza Ali, "Audio Signal Transmission through Correlated Rayleigh Fading Channel with Alamouti-MRC System" International Journal of Electronics and Electrical Engineering, Vol. 1, No. 4, pp. 295-298, December 2013. doi: 10.12720/ijeee.1.4.295-298