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Transmit antenna selection for extended balanced space-time block codes

Original proposal of extended balanced space-time block coding (EBSTBC) and its special subsets like balanced space-time block coding (BSTBC) utilize all available transmit antennas to guarantee full diversity and to maximize the coding gain when few bits of feedback from the destination to the source are available. Due to construction technique of the EBSTBC, an antenna out of N transmit antennas does not contribute the coding gain. To prevent this, a novel the EBSTBC design and transmit scheme is proposed. This scheme transmits only N-1 antennas out of N antennas and an antenna which maximize the received SNR at the destination doubles its transmit power. The proposed scheme improves performance of the EBSTBC and its subsets and outperforms closed-loop extended orthogonal space-time block codes (CL-EO-STBC), phase feedback based extended space-time block codes (PFB-ESTBC), partial phase combining (PPC) and transmit antenna selection (TAS) schemes. Another advantage of the proposed scheme is allowing minimum decoding delay for the EBSTBC. The proposed technique can be applied for orthogonal space-time block codes (OSTBCs) and quasi-orthogonal space-time block codes (QOSTBCs) if the destination informs the source which antenna has the highest gain.