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We propose and construct a new class of full-rate full-diversity quasi-orthogonal space-time block code (QO-STBC), namely four-group QO-STBC (4Gp-QOSTBC), which can support any number of transmit antennas. 4Gp-QOSTBC can linearly separate the symbols into four independent groups, such that symbols within a group is orthogonal to all other symbols in another groups, and the maximum-likelihood (ML)...
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