Detection of Sparse Signals in Sensor Networks via Locally Most Powerful Tests

Xueqian Wang, Gang Li, Pramod Kumar Varshney

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

We consider the problem of detection of sparse stochastic signals with a distributed sensor network. Multiple sensors in the network are assumed to observe sparse signals, which share the joint sparsity pattern. The Bernoulli-Gaussian (BG) distribution with sparsity-enforcing capability is imposed on the sparse signals. The sparsity degree in the BG model is positive and close to zero in the presence of the sparse signals and is zero in the absence of the signals. Motivated by this, the problem of detection of the sparse signals with a distributed sensor network is formulated as the problem of close and one-sided hypothesis testing on the sparsity degree. For this problem, we propose a detector based on the locally most powerful test (LMPT) to decide on the presence or absence of sparse signals with sensor networks. The proposed LMPT detector does not require signal recovery, which alleviates the complexity of the detection system in sensor networks. Simulation results illustrate the performance of the proposed LMPT detector and corroborate our theoretical analysis. Simulation results also show that, compared to the detector based on matching pursuit, the proposed LMPT detector significantly reduces the computational burden without noticeable performance loss.

Original languageEnglish (US)
Article number8423500
Pages (from-to)1418-1422
Number of pages5
JournalIEEE Signal Processing Letters
Volume25
Issue number9
DOIs
StatePublished - Sep 1 2018

Keywords

  • Bernoulli-Gaussian (BG) distribution
  • detection theory
  • locally most powerful tests (LMPTs)
  • sensor networks
  • sparse signals

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering
  • Applied Mathematics

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