Energy-Aware Power Allocation in Cooperative Communication Systems with Imperfect CSI

Energy-aware power allocation in cooperative communication systems depends on the availability of channel state information (CSI), which is often imperfect in practice. This paper proposes energy-aware, optimal power allocation schemes for an amplify-and-forward cooperative communication system in t...

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Bibliographic Details
Published in:IEEE transactions on communications 2013-05, Vol.61 (5), p.1633-1639
Main Authors: Devarajan, R., Punchihewa, A., Bhargava, V. K.
Format: Article
Language:English
Subjects:
Access methods and protocols, osi model
Applied sciences
Channel estimation
Communication channels
Cooperative communication
Detection, estimation, filtering, equalization, prediction
Exact sciences and technology
green communication
imperfect channel estimation
Information, signal and communications theory
Operation, maintenance, reliability
Optimization
power allocation
Quality of service
Relays
Resource management
Signal and communications theory
Signal to noise ratio
Signal, noise
Studies
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Teleprocessing networks. Isdn
Transmission and modulation (techniques and equipments)
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Summary:Energy-aware power allocation in cooperative communication systems depends on the availability of channel state information (CSI), which is often imperfect in practice. This paper proposes energy-aware, optimal power allocation schemes for an amplify-and-forward cooperative communication system in the presence of imperfect CSI, to i) minimize the total transmit power; ii) maximize the end-to-end signal-to-noise ratio (SNR). Energy awareness is incorporated in the schemes either by avoiding over-provisioning of quality-of-service (QoS) or, by preventing unsuccessful transmissions, depending on the application. In both the schemes, the source and relay nodes share a fixed total transmit power budget, and transmission is allowed only if the minimum required end-to-end SNR can be achieved with the available power budget. Closed-form expressions for the source and relay optimal transmit powers are derived for both these schemes. Performance of the systems under the proposed schemes are investigated through simulations.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2013.021513.100278