A sufficient condition for optimality of digital versus analog relaying in a sensor network

Chandrashekhar Thejaswi Ps, Douglas Cochran, Junshan Zhang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

This paper compares the efficacy of digital versus analog relaying in a sensor network when the ultimate goal is detection. A simplified scenario is considered in which a binary decision is to be made at a fusion center based on data it receives from a single sensor. The sensor computes a statistic corresponding to its observations and forwards it over a noisy channel to the fusion center. Two relay schemes: "estimate-and-forward" (analog relaying) and "detect-and-forward" (digital relaying) are compared, in terms of the ultimate detection performance they support at the fusion center. With this performance criterion, the relative merit of the two schemes is shown to depend on the observation SNR at the sensor and the SNR of the communication link connecting the sensor and the fusion center. A sufficient condition, in terms of these SNRs, for the superiority of digital relaying over analog relaying is derived for this simple network model.

Original languageEnglish (US)
Title of host publicationProceedings - 43rd Annual Conference on Information Sciences and Systems, CISS 2009
Pages202-206
Number of pages5
DOIs
StatePublished - Oct 12 2009
Event43rd Annual Conference on Information Sciences and Systems, CISS 2009 - Baltimore, MD, United States
Duration: Mar 18 2009Mar 20 2009

Publication series

NameProceedings - 43rd Annual Conference on Information Sciences and Systems, CISS 2009

Other

Other43rd Annual Conference on Information Sciences and Systems, CISS 2009
CountryUnited States
CityBaltimore, MD
Period3/18/093/20/09

Keywords

  • Analog/digital relays
  • Hypothesis-testing
  • Sensor networks
  • Signal-to-noise ratio

ASJC Scopus subject areas

  • Computer Science Applications
  • Information Systems

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  • Cite this

    Ps, C. T., Cochran, D., & Zhang, J. (2009). A sufficient condition for optimality of digital versus analog relaying in a sensor network. In Proceedings - 43rd Annual Conference on Information Sciences and Systems, CISS 2009 (pp. 202-206). [5054717] (Proceedings - 43rd Annual Conference on Information Sciences and Systems, CISS 2009). https://doi.org/10.1109/CISS.2009.5054717