HIGH-RESOLUTION 3-D DIRECTION-OF-ARRIVAL DETERMINATION FOR URBAN MOBILE RADIO

Citation
J. Fuhl et al., HIGH-RESOLUTION 3-D DIRECTION-OF-ARRIVAL DETERMINATION FOR URBAN MOBILE RADIO, IEEE transactions on antennas and propagation, 45(4), 1997, pp. 672-682
Citations number
21
Categorie Soggetti
Telecommunications,"Engineering, Eletrical & Electronic
ISSN journal
0018926X
Volume
45
Issue
4
Year of publication
1997
Pages
672 - 682
Database
ISI
SICI code
0018-926X(1997)45:4<672:H3DDFU>2.0.ZU;2-2
Abstract
The in-depth knowledge of the mobile radio channel is particularly imp ortant for radio communication modeling and advanced technology system design, We propose an accurate method to determine jointly azimult an d elevation angle and the delay of waves incoming at the receiver. The method is applied to measurements of the complex impulse response of the mobile radio channel, performed on a planar array placed on a mobi le in an urban cellular environment, The directians-of-arrival (DOA) w ere obtained by the means of a recently presented direction finding al gorithm-Two-Dimensional (2-D) Unitary ESPRIT. Two-dimensional spatial smoothing as an extension of ordinary spatial smoothing is utilized to decorrelate coherent waves, The application of 2-D Unitary ESPRIT inc reases the angular resolution over conventional Fourier analysis or th e scattering function by an order of magnitude and overcomes difficult ies due to secondary lobes, The time delay is determined from wideband channel sounder measurements. The results confirm some assumptions on propagation mechanisms: 1) The wave-guiding property of streets (cany on effect), which Is especially pronounced for long-delayed paths; 2) the variation of the number of incoming waves with their excess delay- the larger the excess delay, the lower the number of paths comprising an echo in the power delay profile; 3) if a single path remains, the p rivileged DOA is the direction of the street; 4) the exponential part of the power delay profile due to scatterers all around the receiver; and 5) the elevation dependence of the impinging power, In the tested receiver locations, paths with elevations between 0 degrees and 40 deg rees dominate, containing about 90% of the received power.