Keyholes, correlations and capacities of multi-element transmit and receive antennas

D. Chizhik, G.J. Foschini, M.J. Gans, R.A. Valenzuela
IEEE VTS 53rd Vehicular Technology Conference, Spring 2001. Proceedings (Cat. No.01CH37202)  
Multielement system capacities are usually thought of as limited only by correlations between elements. It is shown here that degenerate channel phenomena called "keyholes" may arise under realistic assumptions which have zero correlation between the entries of the channel matrix H and yet only a single degree of freedom. Canonical physical examples of keyholes are presented. For outdoor environments, it is shown that roof edge diffraction is perceived as a "keyhole" by a vertical base array
more » ... t may be avoided by employing instead a horizontal base array.
doi:10.1109/vetecs.2001.944848 fatcat:grhst3rnk5eujpkfkxdslofp7a