Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Improved coverage in WSNs by exploiting spatial correlation: the two sensor case | Michaelides and Panayiotou EURASIP Journal on Advances in Signal Processing 2011 2011 11 EURASIP Journal on http content 2011 1 11 Advances in Signal Processing a SpringerOpen Journal RESEARCH Open Access Improved coverage in WSNs by exploiting spatial correlation the two sensor case Michalis Michaelides and Christos G Panayiotou Abstract One of the main applications of Wireless Sensor Networks WSNs is area monitoring. In such problems it is desirable to maximize the area coverage. The main objective of this work is to investigate collaborative detection schemes at the local sensor level for increasing the area coverage of each sensor and thus increasing the coverage of the entire network. In this article we focus on pairs of nodes that are closely spaced and can exchange information to decide their collective alarm status in a decentralized manner. By exploiting their spatial correlation we show that the pair can achieve a larger area coverage than the two individual sensors acting alone. Moreover we analyze the performance of different collaborative detection schemes for a pair of sensor nodes and show that the area coverage achieved by each scheme depends on the distance between the two sensors. Keywords Wireless Sensor Networks area monitoring coverage distributed detection spatial correlation Introduction This article investigates a Wireless Sensor Network WSN for monitoring a large area for the presence of an event source that releases a certain signal or substance in the environment which is then propagated over a large area. This sensor network can deal with a number of environmental monitoring and tracking applications including acoustic source localization toxic source identification and early detection of fires 1-3 . In this context a large number of sensor nodes is deployed in the field and the objective is to maximize the area coveragea. In order to maximize the area coverage one can optimally place the sensor nodes and or .
