Outage exponents of block-fading channels with power allocation

  • Authors:
  • Khoa D. Nguyen;Albert Guillén I Fàbregas;Lars K. Rasmussen

  • Affiliations:
  • Institute for Telecommunications Research, University of South Australia, Mawson Lakes, South Australia, Australia;Department of Engineering, University of Cambridge, Cambridge, UK;Communication Theory Laboratory, School of Electrical Engineering and the ACCESS Linnaeus Center, Royal Institute of Technology, Stockholm, Sweden and Institute for Telecommunications Research, Un ...

  • Venue:
  • IEEE Transactions on Information Theory
  • Year:
  • 2010

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Power allocation is studied for fixed-rate transmission over block-fading channels with arbitrary continuous fading distributions and perfect transmitter and receiver channel state information. Both short- and long-term power constraints for arbitrary input distributions are considered. Optimal power allocation schemes are shown to be direct applications of previous results in the literature. It is shown that the short- and long-term outage exponents for arbitrary input distributions are related through a simple formula. The formula is useful to predict when the delaylimited capacity is positive. Furthermore, this characterization is useful for the design of efficient coding schemes for this relevant channel model.