EURASIP Journal on Wireless Communications and Networking,
special issue on Radio Resource Management in 3G+ Systems,
vol. 2006, special issue no. 6, 8 pages, Article Id 16281, May 2006.
Space-Time Water-filling for Composite MIMO Fading Channels
Robert W. Heath, Jr.,
Jeff Andrews, and
Brian L. Evans
Wireless Networking and Communications Group,
Dept. of Electrical and Computer Engineering,
The University of Texas at Austin,
Austin, TX 78712-1084 USA
In this paper, we analyze the ergodic capacity and channel outage
probability for a composite MIMO channel model, which includes both
fast fading and shadowing effects.
The ergodic capacity and exact channel outage probability with
space-time water-filling can be evaluated through numerical integrations,
which can be further simplified with approximated empirical eigenvalue
and maximal eigenvalue distribution of MIMO fading channels.
We also compare the performance of space-time water-filling with
For MIMO channels with small shadowing effects, spatial water-filling
performs very close to space-time water-filling in terms of ergodic capacity.
For MIMO channels with large shadowing effects, however, space-time
water-filling achieves significantly higher capacity per antenna than
spatial water-filling at low to moderate SNR regimes, but with a much
higher channel outage probability.
We show that the analytical capacity and outage probability results
agree very well with those obtained from Monte Carlo simulations.
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Last Updated 05/14/06.