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In this paper, the authors propose a new preprocessing scheme for rate-one Quasi-Orthogonal Space-Time Block Code (QO-STBC), which requires no channel state information at the transmitter. They consider QO-STBCs in real domain so as to utilize the real-valued multidimensional constellation. First, they derive a precoding matrix which makes the effective channel matrix of QO-STBC column-wise orthogonal. Surprisingly, the proposed scheme provides the channel gains identical to the singular values of the channel matrix of STBCs. Since singular value decomposition based precoding method provides better performance than other conventional maximum-likelihood decoding method in coded systems, the proposed scheme outperforms other STBC schemes in coded systems without feedback information, while reducing the decoding complexity dramatically.
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