ABSTRACT
Traditional sensing models assume one or a few powerful sensors and centralized computation. Today, technological trends enable the creation of inexpensive, small, intelligent devices for sensing and actuation. If many small sensors can work together as a sensor network, they provide several advantages over traditional centralized sensing. By placing the sensor close to the object being sensed, signal processing and target discrimination problems in sensing can be greatly simpli¢ed. By communicating over several short hops rather than one long hop, energy consumed in communication can be reduced [29]. Moreover, by processing data in the network, o¯en the amount of data transferred can be reduced, further saving energy [22].
