Universal distributed estimation over multiple access channels with constant modulus signaling

Cihan Tepedelenlioglu, Adarsh B. Narasimhamurthy

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

A distributed estimation scheme where the sensors transmit with constant modulus signals over a multiple access channel is considered. The proposed estimator is shown to be strongly consistent for any sensing noise distribution in the i.i.d. case both for a per-sensor power constraint, and a total power constraint. When the distributions of the sensing noise are not identical, a bound on their variances is shown to establish strong consistency. The estimator is shown to be asymptotically normal with a variance (As) that depends on the characteristic function of the sensing noise. Optimization of the As is considered with respect to a transmission phase parameter for a variety of noise distributions exhibiting differing levels of impulsive behavior. The robustness of the estimator in the sense of degrading gracefully when the sensing noise deviates from the Gaussian distribution to impulsive sensing noise distributions such as those with positive excess kurtosis, or those that do not have finite moments is shown. The proposed estimator is favorably compared with the amplify and forward scheme under an impulsive noise scenario. The effect of fading and phase error at the sensors are shown to not affect the consistency of the estimator, but to degrade the asymptotic variance by terms that depend on the fading and phase error distributions. Simulations corroborate our analytical results.

Original languageEnglish (US)
Article number5475308
Pages (from-to)4783-4794
Number of pages12
JournalIEEE Transactions on Signal Processing
Volume58
Issue number9
DOIs
StatePublished - Sep 1 2010

Keywords

  • Constant modulus
  • distributed estimation
  • empirical characteristic function
  • multiple access channel

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering

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