Decentralized Detection in Wireless Sensor Networks with Channel Fading Statistics. (27th December 2006)

• Record Type: Journal Article
• Authors: Liu Liu, Bin Bin; Chen Chen, Biao Biao
• Other Names: Ko Ko C. C. C. C. Academic Editor.
• Is Part Of: EURASIP journal on wireless communications and networking. Volume 2007(2007)
• Publication Date: 2006-12-27
• Subjects: Wireless communication systems -- Periodicals; Signal processing -- Periodicals; 621.38405
• DOI: 10.1155/2007/62915
• Languages: English
• ISSNs: 1687-1499

Abstract

Abstract : Existing channel aware signal processing design for decentralized detection in wireless sensor networks typically assumes the clairvoyant case, that is, global channel state information (CSI) is known at the design stage. In this paper, we consider the distributed detection problem where only the channel fading statistics, instead of the instantaneous CSI, are available to the designer. We investigate the design of local decision rules for the following two cases: (1) fusion center has access to the instantaneous CSI; (2) fusion center does not have access to the instantaneous CSI. As expected, in both cases, the optimal local decision rules that minimize the error probability at the fusion center amount to a likelihood ratio test (LRT). Numerical analysis reveals that the detection performance appears to be more sensitive to the knowledge of CSI at the fusion center. The proposed design framework that utilizes only partial channel knowledge will enable distributed design of a decentralized detection wireless sensor system.