An Enhanced DSTTD-OFDM System with Decision-Feedback Detection

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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 gain, whereas the conventional DSTTD-OFDM system produces the second order diversity gain. We also suggest openloop power allocation to minimize lower performance bound. Simulation results show that the proposed system outperforms the conventional DSTTD-OFDM system with the ZF-DF detector by about 3.7 dB at the bit error rate (BER) of 10^−4. The openloop power allocation provides additional 1.0 dB performance improvement.
Publisher
IEEE
Issue Date
2007-06-24
Language
ENG
Citation

IEEE International Conference on Communications (ICC 2007), pp.5109 - 5113

ISSN
0536-1486
URI
http://hdl.handle.net/10203/158326
Appears in Collection
EE-Conference Papers(학술회의논문)
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