Energy-Efficient Power Control of Cognitive Femto Users for 5G Communications

We study the energy efficiency issue in 5G communications scenarios, where cognitive femtocells coexist with picocells operating at the same frequency bands. Optimal energy-efficient power allocation based on the sensing-based spectrum sharing (SBSS) is proposed for the uplink cognitive femto users...

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Bibliographic Details
Published in:IEEE journal on selected areas in communications 2016-04, Vol.34 (4), p.772-785
Main Authors: Park, Hyunsung, Hwang, Taewon
Format: Article
Language:English
Subjects:
5G mobile communication
Allocations
cognitive radio
Computational efficiency
Computing time
Design engineering
Energy efficiency
Energy management
femtocell
Femtocells
Optimization
Power control
Resource management
sensing-based spectrum sharing
Sensors
Spectra
Throughput
Ultrafast electronics
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Summary:We study the energy efficiency issue in 5G communications scenarios, where cognitive femtocells coexist with picocells operating at the same frequency bands. Optimal energy-efficient power allocation based on the sensing-based spectrum sharing (SBSS) is proposed for the uplink cognitive femto users operating in a multiuser MIMO mode. Both hard-decision and soft-decision schemes are considered for the SBSS. Different from the existing energy-efficient designs in multiuser scenarios, which consider system-wise energy efficiency, we consider user-wise energy efficiency and optimize them in a Pareto sense. To resolve the nonconvexity of the formulated optimization problem, we include an additional power constraint to convexify the problem without losing global optimality. Simulation results show that the proposed schemes significantly enhance the energy efficiency of the cognitive femto users compared with the existing spectral-efficient designs.
ISSN:0733-8716
1558-0008
DOI:10.1109/JSAC.2016.2544601