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In this paper, a new hybrid stacked cyclic delay diversity (HSCDD) scheme is proposed for the multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) systems to flexibly maximize the tradeoff between multiplexing and diversity gains. Unlike the existing double space time transmit diversity (DSTTD) and the stacked cyclic delay diversity (SCDD) schemes which are suitable...
In this paper, we study the universal optimal STF block codes design for the MIMO- OFDM systems under the IEEE 802.15.3a UWB channel model. We provide a design criterion, an efficient searching algorithm for the optimal STF block codes, and optimal BER performance curves. Among our proposed optimal STF block codes, we find that almost all of them need nonlinear operations. We also find that the BER...
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