An energy-efficient passive monitoring system for wireless sensor networks

The miniaturization of electronic components and the evolution of wireless communication technologies have stimulated the development and use of Wireless Sensor Networks (WSN) in various applications, such as environmental monitoring, seismic detection, military surveillance, inventory tracking and smart spaces, among others. In general, WSNs consist of battery operated small size sensors, which use wireless short range communication. Furthermore, these networks have severe energy consumption constraints, processing power, memory and bandwidth [1].