On the Energy Savings of Adaptive Transmit Power for Wireless Sensor Networks Radio Transceivers

Konferenz: ARCS 2013 - 26th International Conference on Architecture of Computing Systems 2013
19.02.2013 - 22.02.2013 in Prague, Czech Republic

Tagungsband: ARCS 2013

Seiten: 6Sprache: EnglischTyp: PDF

Persönliche VDE-Mitglieder erhalten auf diesen Artikel 10% Rabatt

Alam, Muhammad Mahtab; Berder, Olivier; Menard, Daniel; Sentieys, Olivier (IRISA, University of Rennes 1, France)

In this paper we present an adaptive transmit power optimization technique that is applied under varying channel to reduce the energy per successful transmitted bit. The output power is adaptively tuned to the best power level on link-by-link basis. Each node locally adapts the power according to the signal-to-noise ratio (SNR) variations (for all the neighbor nodes). The optimization is achieved under slow varying channel at the reception of a single packet. There exists an optimal point as the energy per bit reduces until a certain transmit power level and after that it starts increasing (as the signal power is too weak) due to retransmissions. These best points are identified under varying SNR conditions which provide some energy saving at the transmitter end. Different radio transceivers power profiles are used to show the gain over fixed transmit power. It is found that by dynamically adapting the transmit power on average can help to reduce the energy consumption by a factor of two.