Title :
Outage-Constrained Source-Sum-Power Minimization in Multiple-Sensor Single-DF-Relay Networks
Author :
Insook Kim ; Dongwoo Kim
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Hanyang Univ., Ansan, South Korea
Abstract :
This letter provides an optimal power allocation that minimizes source-sum-power consumption under outage constraints in a wireless multiple-sensor single-relay network. We consider decode-and-forward (DF) relaying and assume that direct-link communication does not exist. We provide an exact expression of an optimal power allocation by using Karush-Kuhn-Tucker (KKT) conditions. Constructive details used in finding the optimal power allocation as well as numerical investigation is given to verify the optimality of the proposed solution. Numerical results also show that the proposed power allocation reduces the source-sum-power consumption by nearly 34-69% compared to a non-optimal allocation. The power saving depends on the number of sources and becomes large when the number increases.
Keywords :
decode and forward communication; minimisation; numerical analysis; relay networks (telecommunication); telecommunication power management; wireless sensor networks; KKT; Karush-Kuhn-Tucker; decode-and-forward relaying; direct link communication; multiple sensor single DF relay networks; numerical investigation; optimal power allocation; outage constrained source sum power minimization; source sum power consumption; wireless multiple sensor single relay network; wireless sensor network; Indexes; Minimization; Relays; Resource management; Sensors; Silicon; Wireless sensor networks; Sensor networks; decode-and-forward relaying; outage constraints; source-sum-power minimization;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2013.060513.130652