Joint User-Channel Assignment and Power Allocation for Non-Orthogonal Multiple Access Relaying Networks

被引:11
|
作者
Liang, Guangjun [1 ,2 ]
Zhu, Qi [1 ]
Xin, Jianfang [1 ,2 ]
Feng, Youhong [1 ,3 ]
Zhang, Tianjiao [1 ]
机构
[1] Nanjing Univ Posts & Telecommun, Jiangsu Key Lab Wireless Commun, Coll Telecommun & Informat Engn, Nanjing 210003, Jiangsu, Peoples R China
[2] Anhui Polytech Univ, Elect Engn Sch, Wuhu 241000, Peoples R China
[3] Anhui Normal Univ, Sch Phys & Elect Informat, Wuhu 241000, Peoples R China
关键词
NOMA; user-channel assignment; power allocation; relay; RESOURCE-ALLOCATION; ARTIFICIAL NOISE; NOMA; SYSTEMS; SUBCARRIER; SCHEME; 5G;
D O I
10.1109/ACCESS.2019.2901866
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
Non-orthogonal multiple access (NOMA) technique, which is known to raise the performance of frequency spectrum constrained wireless communication networks, has obtained wide attention. In this paper, a NOMA-based resource allocation problem in the decode-and-forward relaying downlink network is considered. We aim to maximize the average user transmission rate, subject to the total system power constraint and users' quality of service requirement. A joint user-channel assignment and power allocation problem is formulated, which leads to an NP-hard problem requiring an exhaustive search. To tackle this problem, we adopt a decouple optimization method to separate the joint resource problem into two subproblems, a user-channel assignment problem, and a power allocation problem. After solving the two subproblems, a joint alternating optimization algorithm is proposed with low complexity. The simulation results show that the proposed joint optimal scheme can efficiently improve system performance in the limited channels of multiple users relaying networks.
引用
收藏
页码:30361 / 30372
页数:12
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