Abstract
The multipath components of superwideband (2–17.2 GHz) nonline-of-sight channel responses measured inside several buildings are stable along sections that are 27 cm long on average with a standard deviation of 16 cm. The stability regions of multipath components have an approximately log-normal histogram. An analysis of measured channels that explicitly includes finite spatial areas of visibility of the multipath components is superior to the classic analysis that attributes spatial dynamics to interference of the multipath. The spatial stability of measured responses, that is, the size of the typical area of visibility of each multipath component, decreases as the carrier frequency increases but does not depend on bandwidth. The results offer insight into the nature of the diffuse part of the radio channel.
Highlights
The temporal dynamics of radio channels are intimately related to their variation in space
We compare two types of reconstruction of measured impulse responses, both based on the multipath components extracted from them
This paper offers analysis of measured wideband radio channel responses, with an emphasis on the visibility of the multipath components across space
Summary
The temporal dynamics of radio channels are intimately related to their variation in space. Channel analysis that is based on the Doppler spread implicitly assumes that each, multipath component is received over the entire region of receiver locations [1]. We test this assumption using a large measurement campaign to find that it is not realistic even for decimeter scale regions. The common view of multipath channels assumes that spatial dynamics are caused by the interference of multipath components We tested this assumption by comparing two reconstructions of measured impulse responses based on extracted multipath components; in the “unbounded” reconstruction each component was present along the entire (one-meter) range of receiver locations, and in the “bounded” reconstruction they had finite areas of visibility. Spatial dynamics due to blocking of the LoS by people are discussed in [25], and spatial variations of shadowing are shown in indooroutdoor channels in [26]
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