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arXiv 1507.05352cs.ITmath.IT
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I/Q不平衡自干扰协调

I/Q-Imbalance Self-Interference Coordination

Alexandros-Apostolos A. Boulogeorgos, Vasileios M. Kapinas, George K. Karagiannidis, Robert Schober

摘要:

在本文中,我们提出了一种新的低复杂度的方案,它提高了单天线多载波通信系统的性能,遭受同相和正交(I/Q)-不平衡(IQI)在接收机。我们将所提出的方案称为I/Q不平衡自干扰协调(IQSC)。IQSC不仅可以减轻IQI的不利影响,而且通过适当的信号处理,还可以协调IQI产生的自干扰项,以实现二阶频率分集。然而,这些好处是以降低传输速率为代价的。更具体地,IQSC是一种简单的发射分集方案,其通过跨对称(镜像)副载波对的基本信号处理操作来改善接收机处的信号质量。因此,所提出的传输协议具有类似的复杂度阿拉曼的空时块编码方案,不需要额外的发射功率,也不需要任何反馈。为了评估IQSC的性能,我们推导出封闭形式的表达式所产生的中断概率和符号出错率。有趣的是,对于相同的频谱效率和实际目标出错率,IQSC不仅优于现有的IQI补偿方案,而且优于没有IQI的理想系统,同时它实现了与理想几乎相同的性能(即,IQI-free)等速率重复编码。我们的研究结果表明,IQSC是一种很有前途的低复杂性技术,可以显着提高受高水平IQI影响的低成本设备的可靠性。

英文摘要:

In this paper, we present a novel low-complexity scheme, which improves the performance of single-antenna multi-carrier communication systems, suffering from in-phase and quadrature (I/Q)-imbalance (IQI) at the receiver. We refer to the proposed scheme as I/Q-imbalance self-interference coordination (IQSC). IQSC does not only mitigate the detrimental effects of IQI, but, through appropriate signal processing, also coordinates the self-interference terms produced by IQI in order to achieve second-order frequency diversity. However, these benefits come at the expense of a reduction in transmission rate. More specifically, IQSC is a simple transmit diversity scheme that improves the signal quality at the receiver by elementary signal processing operations across symmetric (mirror) pairs of subcarriers. Thereby, the proposed transmission protocol has a similar complexity as Alamouti's space-time block coding scheme and does not require extra transmit power nor any feedback. To evaluate the performance of IQSC, we derive closed-form expressions for the resulting outage probability and symbol error rate. Interestingly, IQSC outperforms not only existing IQI compensation schemes but also the ideal system without IQI for the same spectral efficiency and practical target error rates, while it achieves almost the same performance as ideal (i.e., IQI-free) equal-rate repetition coding. Our findings reveal that IQSC is a promising low-complexity technique for significantly increasing the reliability of low-cost devices that suffer from high levels of IQI.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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