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In this paper, we investigate two space-time receivers based on zero forcing (ZF) and minimum mean square error (MMSE) criteria for space-time transmit diversity (STTD) system in time varying channel. The performances of these schemes are compared with conventional Alamouti's scheme under the condition of combining with/without ordered successive interference cancellation (OSIC) in terms of normalized Doppler frequency and channel estimation error. Finally, an efficient selective decoding algorithm is proposed to obtain the best performance in time varying channel by selecting the best scheme among all the schemes according to normalized Doppler frequency and channel estimation error. The simulation results show that the performance of the proposed scheme is better than that of other respective decoding schemes.