標題: Does More Transmitting Sensors Always Mean Better Decision Fusion in Censoring Sensor Networks with an Unknown Size?
作者: Wang, Tsang-Yi
Wu, Jwo-Yuh
電子工程學系及電子研究所
電機工程學系
電信工程研究所
Department of Electronics Engineering and Institute of Electronics
Department of Electrical and Computer Engineering
Institute of Communications Engineering
關鍵字: Sensor networks;decision fusion;distributed detection;energy efficiency;censoring sensor
公開日期: 1-八月-2012
摘要: This paper examines the impact of sensor censoring on the decision fusion performance in networks with an unknown number of sensors. In performing the decision fusion process, the fusion center applies the Chair-Varshney test; suitably modified to take account of the unknown network size. A closed-form analytical expression is derived for the error probability of the modified fusion rule. It is shown that reducing the censoring probability, i.e., allowing a greater number of sensors to transmit their decisions, does not necessarily improve the decision fusion performance. Rather, there exists a certain censoring probability threshold below which increasing the number of transmitting sensors simply incurs a greater intra-network communication overhead but without improving the global decision performance. Our findings establish that the design of energy-efficient local detection rules should commence with the censoring rate threshold. Hence, it is desirable that the value of this censoring probability threshold be known in advance. Accordingly, the present study proposes an efficient method for identifying the censoring probability threshold value and determining the corresponding local censoring rule.
URI: http://dx.doi.org/10.1109/TCOMM.2012.060112.110078
http://hdl.handle.net/11536/150485
ISSN: 0090-6778
DOI: 10.1109/TCOMM.2012.060112.110078
期刊: IEEE TRANSACTIONS ON COMMUNICATIONS
Volume: 60
起始頁: 2313
結束頁: 2325
顯示於類別:期刊論文