Wireless Communications: Principles and Practice
Wireless Communications: Principles and Practice
Physical modeling and template design for UWB channels with per-path distortion
MILCOM'06 Proceedings of the 2006 IEEE conference on Military communications
A study of the ultra-wideband wireless propagation channel and optimum UWB receiver design
IEEE Journal on Selected Areas in Communications
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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 nondistorted 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.