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In the past decade, the wireless industry continues to revolutionize and develop new technologies. Emerging wireless systems like ultrawideband (UWB) radio and smart antennas have defied channel characterization by the paradigm of traditional approaches. This is due to the fact that the technologies either occupy a large fractional bandwidth or utilize a large array to form narrow beams, which will significantly influence the definition of the channel. The need is now greater than ever for more accurate space-time channel models with emphasis laid on the question how to integrate the system dependency into the parametric model. In the first part of the thesis, we present a comprehensive analysis on the geometric channel models from a system-dependent viewpoint. First, a new perspective of channel characterization has been developed under the rubric of "visible channel" and "invisible channel", which sheds some light on the systemdependent nature of multipath channels. Subsequently, a unified skeleton for geometry-based channel models, which aims at providing the underlying connection between the canonical model and the physical propagation process, has been proposed. Following from the general discussion, we probe into the multipath propagation in street-dominated environments. A parabolic scattering model that complements the widely used circular scattering model for urban macrocells has been introduced to reproduce the waveguiding effects observed in street canyons. The generic approach is also applied to explore the impact of direction-sensitive antennas on scatterer distributions in an urban macrocellular environment. Finally, by extending the unified framework to incorporate the frequency-dispersive effect of ii ATTENTION: The Singapore Copyright Act applies to the use of this document. Nanyang Technological University Library

Space-time channel modeling for emerging wireless techniques : a system-dependent approach