We analyze and simulate the impact of a time-varying Rician fading channel on the performance of an alamouti transmit diversity. We investigate the performance of the three receivers to alleviate the effects of a time-varying Rician fading channel. The investigated systems are the maximum-likelihood, the decision feedback and the zero forcing receivers. The metric is the bit error rate as a function of the channel correlation coefficient ρ. We found that the maximum-likelihood receiver is very tolerant to time-varying Rician fading channel in compare to the other receivers.