Rate and power allocation for discrete-rate link adaptation

Anders Gjendemsjø*, Geir E. Øien, Henrik Holm, Mohamed Slim Alouini, David Gesbert, Kjell J. Hole, Pål Orten

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Link adaptation, in particular adaptive coded modulation (ACM), is a promising tool for bandwidth-efficient transmission in a fading environment. The main motivation behind employing ACM schemes is to improve the spectral efficiency of wireless communication systems. In this paper, using a finite number of capacity achieving component codes, we propose new transmission schemes employing constant power transmission, as well as discrete- and continuous-power adaptation, for slowly varying flat-fading channels. We show that the proposed transmission schemes can achieve throughputs close to the Shannon limits of flat-fading channels using only a small number of codes. Specifically, using a fully discrete scheme with just four codes, each associated with four power levels, we achieve a spectral efficiency within 1dB of the continuous-rate continuous-power Shannon capacity. Furthermore, when restricted to a fixed number of codes, the introduction of power adaptation has significant gains with respect to average spectral efficiency and probability of no transmission compared to a constant power scheme.

Original languageEnglish (US)
Article number394124
JournalEURASIP Journal on Wireless Communications and Networking
StatePublished - 2008
Externally publishedYes

ASJC Scopus subject areas

  • Signal Processing
  • Computer Science Applications
  • Computer Networks and Communications


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