PADRE: Modulated Backscattering-Based PAssive Data REtrieval in Wireless Sensor Networks

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Executive Summary

The most difficult challenge for the design of Wireless Sensor Networks (WSN) is to maintain long network lifetimes since the sensor nodes are severely energy-constrained. Traditional WSN assumes employment of conventional RF transmitters which consume most of the stored power on the sensor node. In this regard, Modulated Backscattering (MB) emerges as a promising communication technique alternative, in which the sensor nodes reflect the incident signal of an RF source and modulate their data on the reflected signal. With the use of MB, the power consumption of the nodes reduce drastically since it replaces the most power consuming component of a typical sensor node, i.e., the RF transmitter.

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