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An important assumption in all orthogonal space-time block coded (OSTBC) systems is that the channel behaves same throughout the codeword length (i.e. quasi-static). However, if the channel is time-varying then the conventional OSTBC detector can suffer from a large error floor at high signal-to-noise ratios. In this paper, the impact of a time-varying, Rayleigh fading channel on the performance of...