Abstract
Space-time block codes based on complex orthogonal design have been widely investigated for their remarkable performance. In this paper, we propose a definition of more general complex orthogonal designs, which permits arbitrary complex factor with unit modulus in each entry. We prove that the maximal rate is still \( \frac{{m + 1}} {{2m}} \) for n = 2m or 2m − 1 antennas and minimal delay is also lower-bounded by \( (_{m - 1}^{2m} ) \). Thus, allowing complex factor with unit modulus in each entry will not improve the main performance criterion of space-time block codes.
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Li, Y., Kan, H., Yuan, C. et al. The maximal rates and minimal decoding delay of more general complex orthogonal designs. Sci. China Inf. Sci. 53, 1826–1832 (2010). https://doi.org/10.1007/s11432-010-4038-1
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DOI: https://doi.org/10.1007/s11432-010-4038-1