Skip to main content
Article thumbnail
Location of Repository

Comparison of Space-Time Water-filling and Spatial Water-filling for MIMO Fading Channels

By Zukang Shen, Robert W. Heath, Jeffrey G. Andrews and Brian L. Evans

Abstract

Abstract — In this paper, we compare the capacities achieved by space-time water-filling and spatial water-filling for MIMO fading channels. Both the effects of fast fading and shadowing are considered. It is found that for Rayleigh fast fading MIMO channels, the spectral efficiency per antenna achieved by onedimensional spatial water-filling is close to two-dimensional space-time water-filling. However, with log-normal shadowing, space-time water-filling achieves significantly higher capacity per antenna than spatial water-filling at low to moderate SNR regimes. Furthermore, space-time water-filling has lower computational complexity than spatial water-filling. It is also shown that space-time water-filling requires a priori knowledge of the channel gain distribution, and for Rayleigh channels with lognormal shadowing, the spectral efficiency advantage over spatial water-filling comes with an increased channel outage probability. I

Year: 2009
OAI identifier: oai:CiteSeerX.psu:10.1.1.135.6473
Provided by: CiteSeerX
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://citeseerx.ist.psu.edu/v... (external link)
  • http://www.ece.utexas.edu/~bev... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.