Effect of imperfect channel information on M-QAM SER performance of orthogonal space-time block codes

The effect of imperfect channel information on the performance of orthogonal space-time block codes is considered in this paper. The symbol error rate of the M-QAM constellation of an orthogonal space-time block code is derived taking into account the effect of imperfect channel information in a Rayleigh fading channel. Derived results show that imperfect channel information destroys the orthogonality of OSTBC, resulting in an error floor that increases with the channel estimation and the normalized Doppler frequency.