Template design and propagation gain for multipath UWB channels with per-path frequency-dependent distortion
Template design and propagation gain for multipath UWB channels with per-path frequency-dependent distortion
复制标题
具有每路径频率相关失真的多路径 UWB 信道的模板设计和传播增益
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
H. Hallen
中科院分区：
文献类型：
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作者：
Neil Mehta;A. Duel;H. Hallen
由于带宽分配较大，超宽带 (UWB) 通道会表现出各个多径分量的频率相关失真。这种每路径失真在室外 UWB 应用中尤其重要，其中接收器可能无法获得视距 (LOS) 或未失真的反射信号，并且主要的传播机制涉及小物体（例如标志或灯柱）的阴影（衍射）或反射。在本文中，采用物理模型来设计以每路径失真为特征的室外单径和多径脉冲无线电信道的鲁棒相关接收机模板。事实证明，采用一组偏导数模板的接收器在能量捕获方面接近最佳，而简单的发射脉冲模板为大多数实际场景提供了出色的复杂性与性能的权衡。此外，还研究了在存在重叠多径分量的情况下保持能量捕获的迭代接收器结构。最后，FCC 频谱的下频带和上频带中的发射脉冲的传播增益之间的巨大差距是针对多种传播机制的特征。*
Due to the large bandwidth allocation, Ultra-Wideband (UWB) channels exhibit frequency-dependent distortion of individual multipath components. This per-path distortion is particularly significant in outdoor UWB applications, where line-of-sight (LOS) or non-distorted reflected signals might not be available at the receiver, and the dominant propagation mechanisms involve shadowing (diffraction) or reflection by small objects (e.g. signs or lamp-posts). In this paper, a physical model is employed in the design of robust correlation receiver templates for outdoor single and multipath impulse radio channels characterized by per-path distortion. It is demonstrated that receivers which employ a set of partial derivatives templates are near-optimal in terms of energy capture while the simple transmit pulse template provides excellent complexity-performance trade-offs for most practical scenarios. Moreover, iterative receiver structures that maintain the energy capture in the presence of overlapping multipath components are investigated. Finally, a large gap between the propagation gains of the transmit pulses in the lower and upper bands of the FCC spectrum is characterized for several propagation mechanisms.*