Spatial and temporal fading correlations of a uniform circular array smart antenna in urban vehicular propagation


Kavak A.

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, cilt.40, ss.61-65, 2004 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 40 Konu: 1
  • Basım Tarihi: 2004
  • Doi Numarası: 10.1002/mop.11285
  • Dergi Adı: MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
  • Sayfa Sayısı: ss.61-65

Özet

For smart antenna systems, the space-time correlation of received signals at an antenna array is a crucial parameter in most adaptive beamforming techniques. In this paper, we experimentally investigate the variation of spatial and temporal fading correlations and the eigenspread of a space-time correlation matrix for a seven-element uniform circular array (UCA) under the line-of-sight (LOS) and the non-line-of-sight (NLOS) urban propagation conditions. A space-time fading correlation model for the UCA, which depends on angular distribution of multipaths, array geometry,, Doppler shift, and time offset, is also proposed. The results show that spatial correlations between any pair of antenna elements in the NLOS propagation are less than those in the LOS propagation, and temporal correlations are approximately the some for both propagation conditions. The NLOS propagation causes larger eigenspread for the space-time correlation matrix, as compared to the NLOS propagation. (C) 2004 Wiley Periodicals, Inc.