Fixed Link Margins Outperforms Power Control in Energy-Limited Wireless Sensor Networks.

Mathias Johansson, Erik Björnemo, and Anders Ahlén, , Uppsala University.

IEEE International Conference on Acoustics Speech and Signal Processing ICASSP 2007 , Honolulu, Hawaii, USA, April 2007. © IEEE

Abstract:

We investigate whether adapting the transmit power optimally to the time-varying channel compares favorably,in terms of total energy consumption,to using a fixed link margin in wireless networks over short transmission distances. Over short distances,the circuit energy consumption dominates the transmission energy.

For that reason, feeding back channel state information a requirement for power control may not be a power efficient strategy. We investigate both slow and fast power control and conclude, somewhat surprisingly, that using a fixed margin is typically more power-efficient than using power control.

Related publications:

Paper at ICASSP07 on multihop versus single hop transmission in energy-limited sensor networks.

Source:

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