Decentralized Detection in Censoring Sensor Networks under Correlated Observations
Coordinated Science Laboratory, University of Illinois at Urbana-Champaign, 1308 W Main St., Urbana, 61801, USA
EURASIP Journal on Advances in Signal Processing 2010, 2010:838921 doi:10.1155/2010/838921Published: 18 March 2010
The majority of optimal rules derived for different decentralized detection application scenarios are based on an assumption that the sensors' observations are statistically independent. Deriving the optimal decision rule in the canonical decentralized setting with correlated observations was shown to be complicated even for the simple case of two sensors. We introduce an alternative suboptimal rule to deal with correlated observations in decentralized detection with censoring sensors using a modified generalized likelihood ratio test (mGLRT). In the censoring scheme, sensors either send or do not send their complete observations to the fusion center. Using ML estimation to estimate the censored values, the decentralized problem is converted to a centralized problem. Our simulation results indicate that, when sensor observations are correlated, the mGLRT gives considerably better performance in terms of probability of detection than does the optimal decision rule derived for uncorrelated observations.