This study analyses in-phase and quadrature-phase imbalance (IQI) in large-scale multiple antenna systems and Rayleigh fading channel. Specifically, the authors compare between different approaches (using pilot-based or blind channel estimation processes) to remove the IQI effect at a base station equipped with massive number of antennas. They obtain closed-form expression for the asymptotic achievable rate when using IQI removal algorithm and zero-forcing data detection. They also provide complexity analysis for the proposed solutions and show, by means of Monte Carlo simulations, that the proposed algorithm improves the system performance even for small number of antennas.

中文翻译：

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多天线系统中的IQ不平衡分析和补偿

本研究分析了大规模多天线系统和瑞利衰落信道中的同相和正交相位不平衡（IQI）。具体来说，作者比较了不同方法（使用基于导频或盲信道估计的方法）以消除配备大量天线的基站的IQI效应。当使用IQI去除算法和迫零数据检测时，它们获得渐近可达到速率的闭式表达式。他们还为所提出的解决方案提供了复杂性分析，并通过蒙特卡洛仿真证明，即使对于少量天线，所提出的算法也可以提高系统性能。