论文标题
MIMO接收器的天线阻抗估计
Antenna Impedance Estimation at MIMO Receivers
论文作者
论文摘要
本文考虑了基于MIMO接收器的训练序列的天线阻抗估计。目的是首先利用大多数无线系统中可用的广泛资源来实时估算天线阻抗。我们假设接收器在每个训练序列中以预定的方式切换其阻抗。基于整个负载的电压观察，开发了一个经典估计框架，并结合了雷利褪色假设。然后，我们以i.i.d.下的最大可能性（ML）估计量来得出封闭形式。褪色并显示相同的ML估计器是相关通道中矩（mM）估计器的方法。数值结果表明一种快速算法，即在I.I.D.中的mle。相关褪色的褪色和MM估计量，对于所有瑞利褪色通道，可以实时估计未知天线阻抗。
This paper considers antenna impedance estimation based on training sequences at MIMO receivers. The goal is to firstly leverage extensive resources available in most wireless systems for channel estimation to estimate antenna impedance in real-time. We assume the receiver switches its impedance in a predetermined fashion during each training sequence. Based on voltage observation across the load, a classical estimation framework is developed incorporating the Rayleigh fading assumption. We then derive in closed-form a maximum-likelihood (ML) estimator under i.i.d. fading and show this same ML estimator is a method of moments (MM) estimator in correlated channels. Numerical results suggest a fast algorithm, i.e., MLE in i.i.d. fading and the MM estimator in correlated fading, that estimates the unknown antenna impedance in real-time for all Rayleigh fading channels.
