Abdur Rahim , Ali Haider , A.N.M. Rezaul Karim , Performance Investigation of Space-Time Coding Under Different Modulation Schemes, International Journal of Electrical and Power Engineering, Volume 1,Issue 2, 2007, Pages 169-171, ISSN 1990-7958, ijepe.2007.169.171, (https://makhillpublications.co/view-article.php?doi=ijepe.2007.169.171) Abstract: In this study we have investigated the performance of space-time coding over flat rayleigh fading channel under different modulation schemes, such as BPSK, QPSK, 8-PSK and 16-QAM. It is shown by computer simulation that the performance of BPSK is the best among the 4-types and QPSK is better than 8-PSK and 8-PSK is better than 16-QAM. Keywords: Rayleigh fading channel;space-time block codes;maximum likelihood decoding