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High spectral efficiency and the reliability can be achieved by multiple transmit/receive antennas. As a such system, double space-time transmit diversity (DSTTD) is introduced. Furthermore, an antenna shuffling using partial channel feedback can additionally improve performance of the DSTTD system. However, the multiple antennas and the amount of feedback overhead are serious burden to system in...
We investigate closed-form bit error rate (BER) expressions for the double space-time transmit diversity (DSTTD) system with a zero-forcing decision-feedback (ZF-DF) detector. We show that the lower Alamouti's STTD unit can obtain the second order diversity gain. However, the upper one cannot guarantee the fourth order diversity due to the effect of error propagation. For example, it simply gives...
We present two ordered successive interference cancellation (OSIC) schemes using the QR decomposition for the double space-time transmit diversity (DSTTD) system. These are designed by zero-forcing (ZF) and minimum-mean-squared error (MMSE) criteria. The computational complexity is significantly reduced by utilizing special structure of the channel matrix. These schemes require fewer computations...
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