Sunday, 8 April 2007

long-hop transimission in sensor networks

(photo quoted from
Application of Sensor Networks
1.In military
Intelligence, surveillance and reconnaissance.
2.In health
Monitor patients and assist disabled patients.
3.Other Commercial applications
Managing inventory, monitoring product quality and monitoring disaster areas.

Sensor network: small size, low cost, low-power
In some situations, log-hop transmission is better than short-hop transmission.

(Wikipedia)A wireless sensor network (WSN) is a wireless network consisting of spatially distributed autonomous devices using sensors to cooperatively monitor physical or environmental conditions, such as temperature, sound, vibration, pressure, motion or pollutants, at different locations. The development of wireless sensor networks was originally motivated by military applications such as battlefield surveillance. However, wireless sensor networks are now used in many civilian application areas, including environment and habitat monitoring, healthcare applications, home automation, and traffic control.
In addition to one or more sensors, each node in a sensor network is typically equipped with a radio transceiver or other wireless communications device, a small microcontroller, and an energy source, usually a battery. The size of a single sensor node can vary from shoebox-sized nodes down to devices the size of grain of dust. The cost of sensor nodes is similarly variable, ranging from hundreds of dollars to a few cents, depending on the size of the sensor network and the complexity required of individual sensor nodes. Size and cost constraints on sensor nodes result in corresponding constraints on resources such as energy, memory, computational speed and bandwidth.
In computer science, wireless sensor networks are an active research area with numerous workshops and conferences arranged each year.


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