Directional macro-cell channel characterization from urban measurements

• Published in: IEEE transactions on antennas and propagation Vol. 48; no. 2; pp. 137 - 146
• Main Authors: Kuchar, A., Rossi, J.-P., Bonek, E.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.02.2000; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antenna arrays; Antenna measurements; Antennas; Azimuth; Channels; Delay; Diffraction; Elevation; Power distribution; Power measurement; Receiving antennas; Robustness; Roofs; Scattering; Signal resolution; Stations; Synthetic arrays; Transmitting antennas
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/8.833062

We measured the angular power distribution at the mobile station in downtown Paris at 890 MHz. The transmit antenna was omnidirectional and placed high above rooftops. The receiver antenna, a 21/spl times/41 element rectangular synthetic array, was located on the roof of a van. The refined high-resolution evaluation method, particularly robust against nonstationary signal components, allows an angular resolution of better than 1/spl deg/ in both azimuth and elevation and a delay resolution of 33 ns. Combined angular/temporal domain measurements are crucial for the understanding of the propagation mechanisms. The evaluated sites showed strongly street-dominated propagation. We found a combined circular and rectangular distribution of scatterers around the mobile station in street-dominated environments. Propagation over the roofs was significant; typically 65% of energy was incident with elevation larger than 100. Our results corroborate the hypothesis on the importance of multiple reflections/diffractions in urban macro cells. We explain this behavior by two reasons: narrow streets favoring a canyon effect and strong scatterers without line-of-sight (LOS) to the mobile station.