Performance of multi-antenna signaling strategies using dual-polarized antennas:
Measurement results and analysis
Rohit U. Nabar, Vinko Erceg, Helmut Bölcskei, and Arogyaswami J. Paulraj
Wireless Personal Communications, Vol. 23, Issue 1, pp. 31-44, Oct. 2002, (invited paper)
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Multiple-input multiple-output (MIMO) wireless systems employ spatial
to increase spectral efficiency or transmit diversity (space-time coding)
techniques to improve link reliability.
The performance of these signaling techniques is highly dependent on channel
in turn depend on antenna height and spacing and richness of scattering. The use of
dual-polarized antennas is a cost- and space-effective alternative where two
spatially separated uni-polarized antennas can be replaced by a single dual-polarized
antenna element. In this paper, we use fixed-wireless experimental data collected in a
typical suburban environment at 2.5GHz to investigate the performance of spatial
multiplexing and transmit diversity (Alamouti scheme) for a dual-polarized antenna
setup. Channel measurements were conducted over a cell of radius 7km and
channel statistics such as K-factor, cross-polarization
discrimination (XPD), and fading signal correlation were extracted from
the gathered data. At each location, different
combinations of these parameters
yield different performance (measured in terms of average uncoded bit error rate)
of spatial multiplexing and the Alamouti scheme.
The results indicate that proper selection of the transmission
mode through feedback, if possible, can reduce the
bit error rate by several orders of magnitude. Furthermore, the results
hint at the existence of a preferred-mode switching distance within a cell
-- above/below which one mode of transmission exhibits generally superior performance.
MIMO wireless, channel measurements, polarization
diversity, spatial multiplexing, Alamouti scheme, preferred-mode switching distance
Reprinted from the conference version.
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Copyright Notice: © 2002 R. U. Nabar, V. Erceg, H. Bölcskei, and A. J. Paulraj.
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