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  • Research Article
  • Open Access

Rate and Power Allocation for Discrete-Rate Link Adaptation

  • 1Email author,
  • 1,
  • 1, 2,
  • 3,
  • 4,
  • 5 and
  • 6, 7
EURASIP Journal on Wireless Communications and Networking20082008:394124

https://doi.org/10.1155/2008/394124

  • Received: 17 July 2007
  • Accepted: 25 December 2007
  • Published:

Abstract

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 1 dB 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.

Keywords

  • Power Transmission
  • Power Allocation
  • Spectral Efficiency
  • Transmission Scheme
  • Wireless Communication System

Publisher note

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Authors’ Affiliations

(1)
Department of Electronics and Telecommunications, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway
(2)
Honeywell Laboratories, Minneapolis, MN 55418, USA
(3)
Department of Electrical and Computer Engineering, Texas A&M University at Qatar, P.O. Box 23874, Doha, Qatar
(4)
Institut Eurécom, 06904 Sophia-Antipolis, France
(5)
Department of Informatics, University of Bergen, 5020 Bergen, Norway
(6)
Thrane & Thrane, 1375 Billingstad, Norway
(7)
University Graduate Center, 2027 Oslo, Norway

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