论文标题
莫斯科接收器的阻抗变化检测
Impedance Variation Detection at MISO Receivers
论文作者
论文摘要
已经提出了技术来估计由于多输入单输出（MISO）接收机的近场载荷条件而导致的未知天线阻抗。但是，尚不清楚何时发生变化，并且必须进行阻抗估计。在这封信中，我们通过将其作为假设检验提出来解决此问题。我们的贡献包括得出广义的似然比测试（GLRT）检测器，以决定天线阻抗是否在两组数据包上发生了变化。这种GLRT配方导致了一个新的优化问题，但是我们提出了一种基于二进制搜索的算法来有效地解决它。与模拟中知名的参考探测器相比，我们衍生的GLRT检测器在更好的检测和虚假警报权衡方面具有更好的检测和虚假警报权衡。结果，更多的传输多样性可显着提高以给定的错误警报率，尤其是在缓慢褪色的频道下的检测准确性。
Techniques have been proposed to estimate unknown antenna impedance due to time-varying near-field loading conditions at multiple-input single-output (MISO) receivers. However, it remains unclear when a change occurs and impedance estimation becomes necessary. In this letter, we address this problem by formulating it as a hypothesis test. Our contributions include deriving a generalized likelihood-ratio test (GLRT) detector to decide if the antenna impedance has changed over two groups of packets. This GLRT formulation leads to a novel optimization problem, but we propose a binary search based algorithm to solve it efficiently. Our derived GLRT detector enjoys a better detection and false alarm trade-off when compared with a well-known, reference detector in simulations. As one result, more transmit diversity significantly improves detection accuracy at a given false alarm rate, especially in slow fading channels.
