University of Twente Student Theses
Investigating the coherence bandwidth and coherence distance of radio signals scattered from u rban building point clouds using physical pptics
Velkers, Arjen (2020) Investigating the coherence bandwidth and coherence distance of radio signals scattered from u rban building point clouds using physical pptics.
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| Abstract: | In this paper the coherence bandwidth and coherence distance of radio channel are investigated in a realistic nonline-of-sight urban setting in Helsinki, where the geometrical information of the environment is characterized using point clouds and the scattered radio signals are computed using physical optics with modified equivalent currents. The surface irregularity of a street wall described by deterministic point clouds is also modeled as a stochastic Gaussian process, providing take-aways for other researchers on simulating the measured reality. The computed radio channel is composed of specular reflection and diffuse scattering at lower 5G frequency bands. Coherence in frequency and spatial domains are calculated and analyzed for different polarized pair of antennas at link ends. The values provide take aways for other researchers on how to design the radio systems for site-specific and missioncritical urban scenarios. The results show that: 1) the antenna polarization does not significantly influence the channel coherence due to the non-negligible contribution of diffuse scattering (nonspecular) to radio channel; 2) the frequency continuity can still be observed over 3.6 to 7.8 MHz, but the spatial consistency is very bad ranging from 7.0 to 15.5 mm with the contamination of the coherent specular reflection with the non-coherent diffuse scattering. |
| Item Type: | Essay (Bachelor) |
| Faculty: | EEMCS: Electrical Engineering, Mathematics and Computer Science |
| Subject: | 53 electrotechnology |
| Programme: | Electrical Engineering BSc (56953) |
| Link to this item: | https://purl.utwente.nl/essays/81901 |
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