Distributed detection in a large wireless sensor network

Ruixin Niu, Pramod K. Varshney, Qi Cheng

Research output: Contribution to journalArticlepeer-review

104 Scopus citations

Abstract

A distributed detection and decision fusion scheme is proposed for a wireless sensor network (WSN) consisting of a large number of sensors. At the fusion center, the total number of detections reported by local sensors are employed for hypothesis testing. Based on the assumption that the received signal power decays as the distance from the target increases, system level detection performance measures, namely probabilities of detection and false alarm, are derived analytically through approximation by using the central limit theorem (CLT). If the number of sensors is sufficiently large, the proposed fusion rule can provide very good system level detection performance, in the absence of the knowledge of local sensors' performances and at low signal to noise ratio (SNR). It is shown that for all the different system parameters we have explored, this fusion rule is equivalent to the optimal fusion rule, which requires much more prior information. To achieve a better system level detection performance, the local sensor level decision threshold should be designed optimally. Numerical methods are employed to find the optimal local sensor level threshold for different sets of system parameters. Guidelines on selecting the optimal local sensor level decision threshold are also provided.

Original languageEnglish (US)
Pages (from-to)380-394
Number of pages15
JournalInformation Fusion
Volume7
Issue number4 SPEC. ISS.
DOIs
StatePublished - Dec 2006

Keywords

  • Decision fusion
  • Distributed detection
  • Signal attenuation model
  • Wireless sensor networks

ASJC Scopus subject areas

  • Software
  • Signal Processing
  • Information Systems
  • Hardware and Architecture

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