Energy-Efficient Resource Allocation for Downlink Non-Orthogonal Multiple Access Network
Non-orthogonal multiple access (NOMA) is a promising technique for the fifth generation mobile communication due to its high spectral efficiency. By applying superposition coding and successive interference cancellation techniques at the receiver, multiple users can be multiplexed on the same subcha...
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Published in | IEEE transactions on communications Vol. 64; no. 9; pp. 3722 - 3732 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
New York
IEEE
01.09.2016
The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subjects | |
Online Access | Get full text |
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Abstract | Non-orthogonal multiple access (NOMA) is a promising technique for the fifth generation mobile communication due to its high spectral efficiency. By applying superposition coding and successive interference cancellation techniques at the receiver, multiple users can be multiplexed on the same subchannel in NOMA systems. Previous works focus on subchannel assignment and power allocation to achieve the maximization of sum rate; however, the energy-efficient resource allocation problem has not been well studied for NOMA systems. In this paper, we aim to optimize subchannel assignment and power allocation to maximize the energy efficiency for the downlink NOMA network. Assuming perfect knowledge of the channel state information at base station, we propose a low-complexity suboptimal algorithm, which includes energy-efficient subchannel assignment and power proportional factors determination for subchannel multiplexed users. We also propose a novel power allocation across subchannels to further maximize energy efficiency. Since both optimization problems are non-convex, difference of convex programming is used to transform and approximate the original non-convex problems to convex optimization problems. Solutions to the resulting optimization problems can be obtained by solving the convex sub-problems iteratively. Simulation results show that the NOMA system equipped with the proposed algorithms yields much better sum rate and energy efficiency performance than the conventional orthogonal frequency division multiple access scheme. |
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AbstractList | Non-orthogonal multiple access (NOMA) is a promising technique for the fifth generation mobile communication due to its high spectral efficiency. By applying superposition coding and successive interference cancellation techniques at the receiver, multiple users can be multiplexed on the same subchannel in NOMA systems. Previous works focus on subchannel assignment and power allocation to achieve the maximization of sum rate; however, the energy-efficient resource allocation problem has not been well studied for NOMA systems. In this paper, we aim to optimize subchannel assignment and power allocation to maximize the energy efficiency for the downlink NOMA network. Assuming perfect knowledge of the channel state information at base station, we propose a low-complexity suboptimal algorithm, which includes energy-efficient subchannel assignment and power proportional factors determination for subchannel multiplexed users. We also propose a novel power allocation across subchannels to further maximize energy efficiency. Since both optimization problems are non-convex, difference of convex programming is used to transform and approximate the original non-convex problems to convex optimization problems. Solutions to the resulting optimization problems can be obtained by solving the convex sub-problems iteratively. Simulation results show that the NOMA system equipped with the proposed algorithms yields much better sum rate and energy efficiency performance than the conventional orthogonal frequency division multiple access scheme. |
Author | Leung, Victor C. M. Haijun Zhang Fang Fang Julian Cheng |
Author_xml | – sequence: 1 surname: Fang Fang fullname: Fang Fang email: fang.fang@alumni.ubc.ca organization: Sch. of Eng., Univ. of British Columbia, Kelowna, BC, Canada – sequence: 2 surname: Haijun Zhang fullname: Haijun Zhang email: dr.haijun.zhang@ieee.org organization: Dept. of Electr. & Comput. Eng., Univ. of British Columbia, Vancouver, BC, Canada – sequence: 3 surname: Julian Cheng fullname: Julian Cheng email: julian.cheng@ubc.ca organization: Dept. of Electr. & Comput. Eng., Univ. of British Columbia, Vancouver, BC, Canada – sequence: 4 givenname: Victor C. M. surname: Leung fullname: Leung, Victor C. M. email: vleung@ece.ubc.ca organization: Sch. of Eng., Univ. of British Columbia, Kelowna, BC, Canada |
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Snippet | Non-orthogonal multiple access (NOMA) is a promising technique for the fifth generation mobile communication due to its high spectral efficiency. By applying... |
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SubjectTerms | Difference of convex Downlink Energy efficiency Mobile communication Multiplexing NOMA non-orthogonal multiple access orthogonal frequency division multiple access Receivers resource allocation Resource management Silicon carbide successive interference cancellation |
Title | Energy-Efficient Resource Allocation for Downlink Non-Orthogonal Multiple Access Network |
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