Title :
Extended-aperture spatial diversity and polarizational diversity using a sparse array of electric dipoles or magnetic loops
Author :
Zoltowski, Michael D. ; Wong, Kainam T.
Author_Institution :
Sch. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN, USA
Abstract :
A novel eigenstructure scheme of extended-aperture spatial diversity and polarizational diversity is proposed for 2D arrival angle estimation. This innovational method involves uniformly spaced triads (or pairs) of electric dipoles or magnetic loops, spaced much farther apart than a half-wavelength. An ESPRIT-based step produces arrival angle estimates that suffer cyclic ambiguity due to the extended spacing. Then, a closed-form integer search is performed over a MUSIC null spectrum for all finite number of possible direction cosines in the cyclic ambiguity using the aforementioned cyclically ambiguous estimates. This approach produces highly accurate, yet unambiguous, azimuth and elevation angle estimates. This novel method facilitates (1) multipath de-correlation (independent fading), (2) coherent summation of multipaths from the same source, and (3) down-link beamforming from the base-station to the mobile
Keywords :
array signal processing; correlation methods; direction-of-arrival estimation; diversity reception; eigenstructure assignment; electromagnetic wave polarisation; fading; land mobile radio; loop antennas; multipath channels; radio links; 2D arrival angle estimation; ESPRIT-based step; MUSIC null spectrum; azimuth estimates; base-station; closed-form integer search; coherent summation; cyclic ambiguity; direction cosines; down-link beamforming; eigenstructure scheme; electric dipoles; elevation angle estimates; extended-aperture polarizational diversity; extended-aperture spatial diversity; independent fading; magnetic loops; multipath decorrelation; sparse array; uniformly spaced triads; Apertures; Array signal processing; Base stations; Fading; Frequency estimation; Magnetic field measurement; Magnetic separation; Polarization; Signal resolution; Spatial resolution;
Conference_Titel :
Vehicular Technology Conference, 1997, IEEE 47th
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-7803-3659-3
DOI :
10.1109/VETEC.1997.600513