Experimental Analysis of Millimeter-wave Channels Based on a Virtual Cubic Antenna Array VNA Based System
Author
Mbugua, Allan Wainaina
Term
4. term
Education
Publication year
2017
Submitted on
2017-06-07
Abstract
This thesis experimentally characterizes indoor millimeter‑wave propagation in the 26–30 GHz band using a vector network analyzer and a virtual uniform cubic antenna array that densely samples the spatial channel. The measurement system was automated to improve repeatability, reliability, and accuracy, and measurement campaigns were conducted in a moderately furnished room under line‑of‑sight (LOS) and obstructed line‑of‑sight (OLOS) conditions. Angles of arrival of multipath components were estimated in azimuth and elevation via classical beamforming, and power–angle–delay and power–delay profiles were analyzed and linked to room geometry and furnishing. Results indicate that LOS is dominated by specular reflections, whereas OLOS exhibits diffuse scattering influenced by the obstructing object. Changes in wall reflectivity noticeably affect the tail of the power–delay profile and the root‑mean‑square delay spread. Overall, the VNA‑based virtual array proved robust and highly repeatable, providing a solid basis for further studies of millimeter‑wave channels.
Denne afhandling undersøger indendørs udbredelse på millimeterbølge (26–30 GHz) eksperimentelt ved hjælp af en vektornetværksanalysator og et virtuelt uniformt kubisk antennearray, som tæt prøvetager kanalen i rummet. Målesystemet blev automatiseret for at sikre høj gentagelighed, pålidelighed og nøjagtighed, og der blev gennemført målekampagner i et moderat møbleret rum under frit sigte (LOS) og obstrueret sigtelinje (OLOS). Ankomstvinkler for flervejskomponenter blev estimeret i azimut og elevation via klassisk beamforming, og effekt‑vinkel‑forsinkelsesprofiler samt effekt‑forsinkelsesprofiler blev analyseret og relateret til rummets geometri og indretning. Resultaterne viser, at LOS domineres af spejlrefleksioner, mens OLOS udviser diffus spredning påvirket af obstruktorens udformning. Ændringer i væggenes reflektivitet påvirker markant halen af effekt‑forsinkelsesprofilen og RMS‑forsinkelsesspredningen. Overordnet viste det VNA‑baserede virtuelle array sig robust og meget reproducerbart og danner et solidt grundlag for videre studier af millimeterbølgekanaler.
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Keywords