Distributed demodulation using consensus averaging in wireless sensor networks

Hao Zhu, Alfonso Cano, Georgios B. Giannakis

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

Abstract

This paper deals with demodulation of space-timetransmissions from a multi-antenna access point to a network of spatially distributed wireless sensors. Distributed demodulation algorithms are developed by achieving network-wide consensus on the average of (cross-) covariances of locally available per sensor received data vectors with the channel matrix, which constitute sufficient statistics for maximum likelihood demodulation. By reaching consensus on such average terms, each sensor can attain demodulation performance as if all the information was available at a centralized unit. Different from existing distributed hypotheses testing schemes whose complexity grows exponentially with the problem dimension, the novel consensusbased demodulator incurs quadratic complexity. Inter-sensor link imperfections due to additive noise and random link failures are also accounted for. Consensus in these cases is achieved in the mean sense with bounded variance, and in the mean-square error sense, respectively. Simulated tests verify the analytical claims. Interestingly, only a few consensus iterations suffice for the novel distributed demodulator to approach the performance of its centralized benchmark.

Original languageEnglish (US)
Title of host publication2008 42nd Asilomar Conference on Signals, Systems and Computers, ASILOMAR 2008
Pages1170-1174
Number of pages5
DOIs
StatePublished - Dec 1 2008
Event2008 42nd Asilomar Conference on Signals, Systems and Computers, ASILOMAR 2008 - Pacific Grove, CA, United States
Duration: Oct 26 2008Oct 29 2008

Publication series

NameConference Record - Asilomar Conference on Signals, Systems and Computers
ISSN (Print)1058-6393

Other

Other2008 42nd Asilomar Conference on Signals, Systems and Computers, ASILOMAR 2008
Country/TerritoryUnited States
CityPacific Grove, CA
Period10/26/0810/29/08

Keywords

  • Consensus averaging
  • Distributed demodulation
  • Wireless sensor networks (WSNs)

ASJC Scopus subject areas

  • Signal Processing
  • Computer Networks and Communications

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