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In this paper we present a modified quasiorthogonal space-time block coding (M QO-STBC) scheme with full diversity and code gain distance (CGD) for use in asynchronous relay networks. We implement an orthogonal frequency division multiplexing (OFDM) scheme with cyclic prefix (CP) at the source to mitigate the effects of random delays between the relay nodes and the destination caused by asynchronism...
In this paper we consider quasi-orthogonal distributed space-time block codes (D-STBCs) for application in cooperative wireless network. One scheme is designed by using appropriate signal rotations and set partitioning of two quasi-orthogonal codebooks. The codebooks are formed from the union of two modified quasi-orthogonal codes, then the union is pruned down by one-half. In contrast, the closed-loop...
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