Integrated energy analysis of error correcting codes and modulation for energy efficient wireless sensor nodes

Sonali Chouhan, Ranjan Bose, M. Balakrishnan

Research output: Contribution to journalArticlepeer-review

50 Scopus citations

Abstract

Optimizing energy consumption is a key objective in designing wireless sensor nodes. It has been shown earlier [1] that the node energy is strongly influenced by the modulation and the error correcting code (ECC) used. The utility of using ECC from an energy perspective is determined by the energy saving due to the ECC coding gain vis-a-vis the energy overhead of "redundant" bits and of encoding/decoding computation. Furthermore, the node energy varies with the change in errorcorrecting capability and code word length of a particular ECC as well as the modulation constellation size. The ECC coding gain is influenced by the constellation size. In this paper, the node energy variations with ECC and modulation parameters are analyzed for an energy optimal node design for the nodes operating in the additive white Gaussian noise channel. Based on this analysis, we compute the per information bit node energy and this is used to select an "optimal" ECC and modulation scheme pair. Our results show that the energy optimal ECC-modulation pair selected for some specific operating conditions could save as much as 50% energy. In nutshell, our work is targeted towards reducing the search space and finding an energy optimal ECCmodulation pair for the given environment and application.

Original languageEnglish
Article number5288968
Pages (from-to)5348-5355
Number of pages8
JournalIEEE Transactions on Wireless Communications
Volume8
Issue number10
DOIs
StatePublished - Oct 2009
Externally publishedYes

Keywords

  • Block codes
  • Communication systems
  • Energy management
  • Modulation
  • Reed-Solomon codes

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