Energy-efficient power allocation for non-regenerative OFDM relay links

We consider a two-hop non-regenerative （amplify-and-forward） relay link with one source, one destination and one relay, in which orthogonal frequency division multiplexing （OFDM） is used. The power allocation （PA） to maximize the energy efficiency for the whole link is investigated under quality of...

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Bibliographic Details
Published in:Science China. Information sciences 2013-02, Vol.56 (2), p.52-59
Main Authors: Yu, Huan, Qin, HaoHao, Li, YunZhou, Zhao, YiFei, Xu, XiBin, Wang, Jing
Format: Article
Language:English
Subjects:
allocation
Allocations
Approximation
communication
Complexity
Computer Science
cooperative
efficiency
energy
Energy management
Information Systems and Communication Service
Links
Lower bounds
Mathematical analysis
OFDM
Orthogonal Frequency Division Multiplexing
power
Relay
Research Paper
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Summary:We consider a two-hop non-regenerative （amplify-and-forward） relay link with one source, one destination and one relay, in which orthogonal frequency division multiplexing （OFDM） is used. The power allocation （PA） to maximize the energy efficiency for the whole link is investigated under quality of service （Qos） require- ment and separate power constraints. An approximation method with low complexity is first proposed to convert the PA problem into a quasi-concave problem, which can obtain a tight lower bound in high SNR region. Furthermore, a more accurate approximation method with higher complexity is raised, which can approach the actual performance both in the low SNR and high SNR regions. We also introduce subcarrier pairing scheme to further enhance the energy efficiency for the link. Simulation results are shown to compare the performance of the two proposed methods.
ISSN:1674-733X
1869-1919
DOI:10.1007/s11432-012-4770-9