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Source-Sum-Power Minimization in Multi-Sensor Single-Relay Networks with Direct Links

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2 Author(s)
Insook Kim ; Dept. of Electr. Eng. & Comput. Sci., Hanyang Univ., Ansan, South Korea ; Dongwoo Kim

This letter provides power allocation that minimizes source-sum-power in wireless multi-sensor single-relay networks with direct links. As relaying methods, amplify-and-forward (AF) and decode-and-forward (DF) are examined, respectively. For DF relaying, an exact optimal power allocation is provided by using Karush-Kuhn-Tucker (KKT) condition, but a suboptimal allocation is presented for AF relaying since the problem becomes non-convex in AF case. Numerical investigation is used to verify the optimality of the proposed solutions, to compare the source-power consumptions with and without the direct link and to examine the effect of relay location on the power consumption.

Published in:

Communications Letters, IEEE  (Volume:16 ,  Issue: 7 )