Distributed estimation using reduced-dimensionality sensor observations

Ioannis D. Schizas, Georgios B Giannakis, Zhi-Quan Luo

Research output: Contribution to journalArticle

150 Scopus citations

Abstract

We derive linear estimators of stationary random signals based on reduced-dimensionality observations collected at distributed sensors and communicated to a fusion center over wireless links. Dimensionality reduction compresses sensor data to meet low-power and bandwidth constraints, while linearity in compression and estimation are well motivated by the limited computing capabilities wireless sensor networks are envisioned to operate with, and by the desire to estimate random signals from observations with unknown probability density functions. In the absence of fading and fusion center noise (ideal links), we cast this intertwined compression-estimation problem in a canonical correlation analysis framework and derive closed-form mean-square error (MSE) optimal estimators along with coordinate descent suboptimal alternatives that guarantee convergence at least to a stationary point. Likewise, we develop estimators based on reduced-dimensionality sensor observations in the presence of fading and additive noise at the fusion center (nonideal links). Performance analysis and corroborating simulations demonstrate the merits of the novel distributed estimators relative to existing alternatives.

Original languageEnglish (US)
Pages (from-to)4284-4299
Number of pages16
JournalIEEE Transactions on Signal Processing
Volume55
Issue number8
DOIs
StatePublished - Aug 1 2007

Keywords

  • Canonical correlation analysis (CCA)
  • Distributed compression
  • Distributed estimation
  • Nonlinear optimization
  • Wireless sensor networks (WSNs)

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