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

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...

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Bibliographic Details
Published in:IEEE communications letters 2012-07, Vol.16 (7), p.1076-1079
Main Authors: KIM, Insook, KIM, Dongwoo
Format: Article
Language:English
Subjects:
Access methods and protocols, osi model
Allocations
Amplification
Applied sciences
Detection, estimation, filtering, equalization, prediction
direct link
Exact sciences and technology
Information, signal and communications theory
Links
Mathematical models
Networks
Optimization
Power consumption
Power demand
Relaying
relaying technique
Relays
Resource management
sensor networks
Sensors
Services and terminals of telecommunications
Signal and communications theory
Signal to noise ratio
Signal, noise
Silicon
Source-sum-power minimization
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Telemetry. Remote supervision. Telewarning. Remote control
Teleprocessing networks. Isdn
Wireless sensor networks
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Summary: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.
ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2012.050112.120535