University of Oulu

Van Nguyen, B., Vu, Q., Kim, K. (2018) Analysis and Optimization for Weighted Sum Rate in Energy Harvesting Cooperative NOMA Systems. IEEE Transactions on Vehicular Technology, 67 (12), 12379-12383. doi:10.1109/TVT.2018.2873412

Analysis and optimization for weighted sum rate in energy harvesting cooperative NOMA systems

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Author: Nguyen, Binh Van1,2; Vu, Quang-Doanh3; Kim, Kiseon4
Organizations: 1Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam
2School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju 500-712, South Korea
3Centre for Wireless Communications, University of Oulu, Oulu FI-90014
4School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju 500-712, Korea
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.2 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2019040110636
Language: English
Published: Institute of Electrical and Electronics Engineers, 2018
Publish Date: 2019-04-01
Description:

Abstract

We consider a cooperative non-orthogonal multiple access system with radio frequency energy harvesting, in which a user with good channel harvests energy from its received signal and serves as a decode-and-forward relay for enhancing the performance of a user with poor channel. We here aim at maximizing the weighted sum rate of the system by optimizing the power allocation coefficient used at the source and the power splitting coefficient used at the user with good channel. By exploiting the specific structure of the considered problem, we propose a low-complexity one-dimensional search algorithm, which can provide optimal solution to the problem. As a benchmark comparison, we derive analytic expressions and simple high signal-to-noise ratio (SNR) approximations of the ergodic rates achieved at the two users and their weighted sum with fixed values of the power allocation and the power splitting coefficients, from which the scaling of the weighted sum in the high SNR region is revealed. Finally, we provide representative numerical results to demonstrate the validity of our results.

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Series: IEEE transactions on vehicular technology
ISSN: 0018-9545
ISSN-E: 1939-9359
ISSN-L: 0018-9545
Volume: 67
Issue: 12
Pages: 12379 - 12383
DOI: 10.1109/TVT.2018.2873412
OADOI: https://oadoi.org/10.1109/TVT.2018.2873412
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Subjects:
Academy of Finland Grant Number: 318927
Detailed Information: 318927 (Academy of Finland Funding decision)
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