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Research Article Censored Distributed Space-Time Coding for Wireless Sensor Networks (2007)
BibTeX
@MISC{Yiu07researcharticle,
author = {S. Yiu and R. Schober},
title = {Research Article Censored Distributed Space-Time Coding for Wireless Sensor Networks},
year = {2007}
}
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Abstract
We consider the application of distributed space-time coding in wireless sensor networks (WSNs). In particular, sensors use a common noncoherent distributed space-time block code (DSTBC) to forward their local decisions to the fusion center (FC) which makes the final decision. We show that the performance of distributed space-time coding is negatively affected by erroneous sensor decisions caused by observation noise. To overcome this problem of error propagation, we introduce censored distributed space-time coding where only reliable decisions are forwarded to the FC. The optimum noncoherent maximum-likelihood and a low-complexity, suboptimum generalized likelihood ratio test (GLRT) FC decision rules are derived and the performance of the GLRT decision rule is analyzed. Based on this performance analysis we derive a gradient algorithm for optimization of the local decision/censoring threshold. Numerical and simulation results show the effectiveness of the proposed censoring scheme making distributed space-time coding a prime candidate for signaling in WSNs. Copyright © 2008 S. Yiu and R. Schober. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 1.
Keyphrases
space-time coding wireless sensor network research article censored local decision distributed space-time coding glrt decision rule original work space-time block code performance analysis prime candidate final decision reliable decision creative common attribution license fc decision rule likelihood ratio test observation noise gradient algorithm censoring scheme common noncoherent unrestricted use optimum noncoherent maximum-likelihood error propagation fusion center simulation result open access article erroneous sensor decision
