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

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3 Author(s)
Johansson, M. ; Signals & Syst., Uppsala Univ. ; Bjornemo, E. ; Ahlen, A.

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

Published in:

Acoustics, Speech and Signal Processing, 2007. ICASSP 2007. IEEE International Conference on  (Volume:3 )

Date of Conference:

15-20 April 2007

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