Browsing by Author "Wasson, Michael William"

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    A Below-Rooftop Dense Urban Wireless Channel Model Based on Empirical Measurements
    (2015-12-22) Wasson, Michael William; Messier, Geoffrey; Fapojuwo, Abraham; O'Keefe, Kyle
    This thesis presents a wireless propagation channel model for the below-rooftop dense urban environment based on empirical measurements conducted in the downtown core of Calgary, Alberta. The measurements characterize a 2x1 multiple input single output channel in the 2.47 GHz band. Two communication scenarios were examined: a picocell mobile scenario consisting of a stationary base station and mobile handsets, and a point-to-point fixed-position wireless communication system consisting of two immobile wireless nodes mounted on utility poles above pedestrian traffic. Measurements were conducted with two antenna types: an omnidirectional dipole, and a polarized directional antenna. Low path-loss values measured with both omnidirectional and directional antennas suggest that buildings lining the downtown streets behave like a waveguide. Directional antennas experience substantially less small scale fading, but are more susceptible to shadowing obstructions. Directional antenna rejection measurements suggest that systems employing space-division multiplexing will experience little interference.