A parametric UWB propagation channel estimation and its performance validation in an anechoic chamber
A parametric UWB propagation channel estimation and its performance validation in an anechoic chamber
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DOI：
10.1109/tmtt.2006.871990
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发表时间：
2006-04
影响因子：
4.3
通讯作者：
K. Haneda;J. Takada;Takehiko Kobayashi
中科院分区：
文献类型：
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作者：
K. Haneda;J. Takada;Takehiko Kobayashi
提出了一种基于参数信道估计的超宽带(UWB)信道探测方案，以实现对传播信道的精确探测。通道测深仪由一个矢量网络分析仪和测量空间传递函数的合成阵列组成。然后将测量数据应用于基于最大似然(ML)的估计器。基于最大似然估计的参数信道估计的概念是：1)探测传播路径的幅度和相位的频率相关效应；2)结合稳健的测向概念，即入射波的球面波前模型。将整个频带划分为多个子带，并对每个子带进行幅度和相位估计。球面波前模型包含了一个新的模型参数-曲率半径，该参数在传统的平面波前模型中没有被覆盖。通过暗室测试对所提出的参数UWB信道估计方案的性能进行了评估。测试表明：1)如果路径分辨，则可以准确地检测出与频率相关的幅值和相位；2)在近程环境下，球面波前的模拟效果优于平面波前。此外，还评估了探测方案的基本性能，即角度分辨率和时间分辨率。
This paper presents an ultrawide-band (UWB) channel sounding scheme with a parametric channel estimation to seek accurate probing of the propagation channel. The channel sounder consists of a vector network analzer and synthetic array to measure spatial transfer functions. The measured data are then applied to a maximum-likelihood (ML)-based estimator. The concepts implemented in the ML-based parametric channel estimation are: 1) to probe frequency-dependent effects in magnitude and phase of propagation paths and 2) to incorporate with robust concept of direction finding, namely, the spherical wavefront model of incident waves. The whole frequency band was divided into subbands, and the estimation of magnitude and phase was conducted in each subband. The spherical wavefront model includes a new model parameter, curvature radii, which is not covered in the conventional plane wavefront model. Performances of the proposed parametric UWB channel estimation scheme was assessed by anechoic chamber tests. The test demonstrated that: 1) the frequency-dependent magnitude and phase were accurately detected if the path was resolved and 2) the spherical wavefront outperformed the plane wavefront to model measured data given the short-range environment. Furthermore, fundamental performance of the sounding scheme, i.e., angular and time resolutions, were also evaluated in the test.