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It has been shown that a quasi-orthogonal space-time block code (QOSTBC) provides full transmission rate and half of the maximum possible diversity for four transmit antennas. We can see that QOSTBC has high complexity at the decoder since pairs of transmitted symbols are decoded with two parallel maximum likelihood (ML) detectors. In this paper, we propose new decoding schemes for reducing complexity...
A fast maximum-likelihood (ML) detection scheme is proposed for the important quasi-orthogonal space-time block codes (STBCs) of symbol rate 2 for three and four transmission antennas. In particular, the proposed scheme is applicable even to the under-determined system where the number of transmission antennas is larger than that of the receive antennas. The half of the symbols of the transmission...
ABBA codes are an important class of quasi- orthogonal space-time block codes proposed by Tirkkonen et al.. Recently, they have become more attractive for practical applications because Yuen et al. have shown that ABBA codes allow pair-wise real-symbol decoding (or equivalently, single-complex symbol decoding) complexity; it is the minimum decoding complexity (MDC) achievable by any non-OSTBC. Additionally,...
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