TY - JOUR
T1 - Energy-efficient joint user-RB association and power allocation for uplink hybrid NOMA-OMA
AU - Zeng, Ming
AU - Yadav, Animesh
AU - Dobre, Octavia A.
AU - Vincent Poor, H.
N1 - Funding Information:
Manuscript received November 20, 2018; revised December 21, 2018; accepted January 15, 2019. Date of publication February 1, 2019; date of current version June 19, 2019. This work was supported in part by the Natural Sciences and Engineering Research Council of Canada through its Discovery Program and in part by the U.S. National Science Foundation under Grant CCF–1513915. This work was presented in part at Globecom 2018 [1]. (Corresponding author: Octavia A. Dobre.) M. Zeng and O. A. Dobre are with the Faculty of Engineering, Memorial University, St. John’s, NL A1B 3X9, Canada (e-mail: mzeng@mun.ca; odobre@mun.ca).
Publisher Copyright:
© 2014 IEEE.
PY - 2019/6
Y1 - 2019/6
N2 - In this paper, energy efficient resource allocation is considered for an uplink hybrid system, where non-orthogonal multiple access is integrated into orthogonal multiple access (OMA). To ensure the quality of service for the users, a minimum rate requirement is predefined for each user. An energy efficiency (EE) maximization problem is formulated by jointly optimizing the user clustering, channel assignment, and power allocation (PA). To address this problem, a many-to-one bipartite graph is first constructed considering the users and resource blocks (RBs) as the two sets of nodes. Based on swap matching, a joint user-RB association and PA scheme is proposed, which converges within a limited number of iterations. Moreover, for the PA under a given user-RB association, a feasibility condition is first derived. If feasible, a low-complexity algorithm is proposed, which obtains optimal EE for any successive interference cancellation (SIC) order and an arbitrary number of users. In addition, for the special case of two users per cluster, analytical solutions are provided for the two orders in which SIC can be implemented. These solutions shed light on how the power is allocated for each user to maximize the EE. Numerical results are presented, which show that the proposed joint user-RB association and PA algorithm outperforms other hybrid multiple-access-based and OMA-based schemes.
AB - In this paper, energy efficient resource allocation is considered for an uplink hybrid system, where non-orthogonal multiple access is integrated into orthogonal multiple access (OMA). To ensure the quality of service for the users, a minimum rate requirement is predefined for each user. An energy efficiency (EE) maximization problem is formulated by jointly optimizing the user clustering, channel assignment, and power allocation (PA). To address this problem, a many-to-one bipartite graph is first constructed considering the users and resource blocks (RBs) as the two sets of nodes. Based on swap matching, a joint user-RB association and PA scheme is proposed, which converges within a limited number of iterations. Moreover, for the PA under a given user-RB association, a feasibility condition is first derived. If feasible, a low-complexity algorithm is proposed, which obtains optimal EE for any successive interference cancellation (SIC) order and an arbitrary number of users. In addition, for the special case of two users per cluster, analytical solutions are provided for the two orders in which SIC can be implemented. These solutions shed light on how the power is allocated for each user to maximize the EE. Numerical results are presented, which show that the proposed joint user-RB association and PA algorithm outperforms other hybrid multiple-access-based and OMA-based schemes.
KW - Energy efficiency (EE)
KW - Non-orthogonal multiple access (NOMA)
KW - Power allocation (PA)
KW - Uplink transmission
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U2 - 10.1109/JIOT.2019.2896946
DO - 10.1109/JIOT.2019.2896946
M3 - Article
AN - SCOPUS:85067875718
SN - 2327-4662
VL - 6
SP - 5119
EP - 5131
JO - IEEE Internet of Things Journal
JF - IEEE Internet of Things Journal
IS - 3
M1 - 8632657
ER -