Estimation of Noise Parameters in Multi-Antenna Receivers using Digitized Signal Samples
Estimation of Noise Parameters in Multi-Antenna Receivers using Digitized Signal Samples
复制标题
使用数字化信号样本估计多天线接收器中的噪声参数
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
B. Lankl
中科院分区：
文献类型：
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作者：
M. Ivrlac;Bernhard Lehmeyer;J. Nossek;C. Hofmann;B. Lankl
即使在天线彼此电靠近地间隔开的情况下，多天线系统也可以提供多流和分集操作。这就要求在天线端口和接收机的低噪声放大器（lna）的输入端之间连接一个去耦和匹配网络（dmn）。dmn的工作是对连接到lnas的端口进行电解耦，并为后者提供最佳驱动阻抗，使得它们的噪声系数最小（噪声匹配）。实现噪声匹配的驱动阻抗的值仅取决于接收机的某些噪声参数。据我们所知，目前还没有能够测量这些参数的测量设备。在本文中，我们报告了一个简单的计划，通过该计划，这些噪声参数可以估计使用多天线接收机本身作为测量设备。其思想是通过同轴电缆连接两个lna的输入，并估计各自接收器链的数字化输出的相关系数。从对于同轴电缆的两个不同长度获得的两个这样的估计的相关系数，可以获得与噪声匹配相关的所有噪声参数。
Multi-antenna systems can provide multi-streaming and diversity operation even in the case where the antennas are spaced electrically close to each other. This requires that a decoupling and matching network (dmn) is connected between the antenna ports and the inputs of the low-noise amplifiers (lna) of the receiver. The job of the dmn is to electrically decouple the ports which are connected to the lnas, and to provide the latter with the optimum driving impedance such that their noise figure is minimum (noise matching). The value of the driving impedance to achieve noise matching only depends on certain noise parameters of the receiver. To our best knowledge, there is no measurement equipment available to this date, which would allow to measure these parameters. In this paper, we report on a simple scheme by which these noise parameters can be estimated using the multiantenna receiver itself as the measurement equipment. The idea is to connect the inputs of two lnas by a coax cable and estimate the correlation coefficient of the digitized outputs of the respective receiver chains. From two such estimated correlation coefficients obtained for two different lengths of the coax cable, all noise parameters which are relevant for noise matching can be obtained.