Censored Noncoherent Distributed Space-Time Coding for Wireless Sensor Networks

TitleCensored Noncoherent Distributed Space-Time Coding for Wireless Sensor Networks
Publication TypeConference Paper
Year of Publication2007
AuthorsYiu, S., and R. Schober
Conference NameWireless Communications and Networking Conference, 2007.WCNC 2007. IEEE
Pagination600 -605
Date Publishedmar.
Keywordscensored noncoherent distributed space-time coding, decision rules, decision/censoring threshold, fusion center, generalized likelihood ratio test, gradient algorithm, gradient methods, optimum noncoherent maximum-likelihood, sensor fusion, space-time codes, wireless sensor networks

In this paper, 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. To overcome this problem, 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 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.


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