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This paper presents a new double space-time transmit diversity-orthogonal frequency division multiplexing (DSTTD-OFDM) scheme using the zero-forcing decision-feedback (ZF-DF) detector. To improve the diversity gain of streams in the lower Alamouti's STTD unit, the proposed system adopts frequency-repetition method. Analytical results verify that the proposed system can obtain the fourth order diversity...
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