On quasi-orthogonal space-time block codes for dual-polarized MIMO channels
On quasi-orthogonal space-time block codes for dual-polarized MIMO channels
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DOI：
10.1109/twc.2011.110811.111061
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发表时间：
2011-12
期刊：
影响因子：
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通讯作者：
Yabo Li;Haiquan Wang;X. Xia
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文献类型：
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作者：
Yabo Li;Haiquan Wang;X. Xia
双极化天线作为一种节省空间和成本的天线配置，广泛应用于真实的MIMO无线通信系统中。准正交空时码（QOSTBC）由于其在传输速率和译码复杂度上的优势，成为一种重要的多天线发射分集方案。在本文中，我们研究了双极化MIMO信道的QOSTBC的性能。我们表明，当QOSTBC与双极化天线一起使用时，我们需要小心地将功率放大器（PA）输出连接到不同极化的天线，以避免在高交叉极化鉴别（XPD）下出现超过1dB的性能损失。此外，我们表明，如果QOSTBC与星座旋转，实现全分集在单极化MIMO信道中，使用，由于不良PA到天线连接的性能损失减轻。然而，当XPD高时，如果连接正确，则没有全分集的QOSTBC可以比具有全分集但连接不良的QOSTBC获得更好的性能，这表明在高XPD下适当连接的重要性。因此，为了保证QOSTBC在任何XPD下的鲁棒性能，除了设计具有全分集和良好分集积的码之外，PA输出到天线之间的正确连接也很重要。
As a space and cost-efficient antenna configuration, dual-polarized antennas are widely deployed in real field MIMO wireless communication systems. The Quasi-Orthogonal Space-Time Code (QOSTBC), due to its advantages in the transmission rate and the decoding complexity, is an important transmit diversity scheme for more than 2 transmit antennas. In this paper, we investigate the performance of QOSTBC for dual-polarized MIMO channels. We show that when QOSTBC is used with dual-polarized antennas, we need to connect the power amplifier (PA) outputs to the differently polarized antennas carefully, in order to avoid more than 1dB performance loss at high cross-polar discrimination (XPD). Also, we show that, if the QOSTBC with constellation rotations, which achieves full diversity in uni-polarized MIMO channels, is used, the performance loss due to the bad PA to antenna connections is mitigated. However, when the XPD is high, the QOSTBC without full diversity, if connected properly, can achieve better performance than the QOSTBC with full diversity but connected badly, which shows the importance of proper connection at high XPD. So, to guarantee robust performance of QOSTBC at any XPD, besides designing codes to have full diversity and good diversity product, connecting properly between the PA outputs to the antennas is also important.