TY - JOUR
T1 - Optimal Relay Selection Schemes for Cooperative NOMA
AU - Xu, Peng
AU - Yang, Zheng
AU - Ding, Zhiguo
AU - Zhang, Zufan
N1 - Funding Information:
Manuscript received October 26, 2017; revised February 26, 2018; accepted March 26, 2018. Date of publication April 2, 2018; date of current version August 13, 2018. The work of P. Xu was supported by the National Natural Science Foundation of China under Grant 61701066, the Scientific and Technological Research Program of Chongqing Municipal Education Commission under Grant KJ1704088, the Project of Fundamental and Frontier Research Plan of Chongqing under Grant cstc2017jcyjAX0204, and the Doctoral Initial Funding of Chongqing University of Posts and Telecommunications under Grant A2016-84. The work of Z. Yang was supported by National Natural Science Foundation of China under Grant 61701118 and Grant 61571128 and National Natural Science Foundation of Fujian Province under Grant 2018J05101. The work of Z. Ding was supported by the UK EPSRC under Grant EP/ L025272/1 and by H2020-MSCA-RISE-2015 under Grant 690750. The associate editor coordinating the review of this manuscript and approving it for publication was Dr. H. Lin. (Corresponding author: Peng Xu.) P. Xu and Z. Zhang are with the Chongqing Key Laboratory of Mobile Communications Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China (e-mail:,[email protected]; zhangzf@ cqupt.edu.cn).
Publisher Copyright:
© 1967-2012 IEEE.
PY - 2018/8
Y1 - 2018/8
N2 - This correspondence paper investigates relay selection (RS) schemes for cooperative downlink nonorthogonal multiple access (NOMA) networks with multiple relays. Two optimal RS schemes, termed as the two-stage weighted-max-min (WMM) and max-weighted-harmonic-mean (MWHM) schemes, are proposed for cooperative NOMA with fixed and adaptive power allocations (PAs) at the relays, respectively. Then, the outage probabilities of the two proposed RS schemes are analyzed, and their diversity gains are also determined. The provided simulation results show that the proposed optimal two-stage WMM and MWHM schemes outperform the existing suboptimal RS schemes for cooperative NOMA networks with fixed and adaptive PAs at the relays, respectively.
AB - This correspondence paper investigates relay selection (RS) schemes for cooperative downlink nonorthogonal multiple access (NOMA) networks with multiple relays. Two optimal RS schemes, termed as the two-stage weighted-max-min (WMM) and max-weighted-harmonic-mean (MWHM) schemes, are proposed for cooperative NOMA with fixed and adaptive power allocations (PAs) at the relays, respectively. Then, the outage probabilities of the two proposed RS schemes are analyzed, and their diversity gains are also determined. The provided simulation results show that the proposed optimal two-stage WMM and MWHM schemes outperform the existing suboptimal RS schemes for cooperative NOMA networks with fixed and adaptive PAs at the relays, respectively.
KW - Cooperative NOMA
KW - outage probability
KW - relay selection
UR - http://www.scopus.com/inward/record.url?scp=85044752185&partnerID=8YFLogxK
U2 - 10.1109/TVT.2018.2821900
DO - 10.1109/TVT.2018.2821900
M3 - Article
AN - SCOPUS:85044752185
SN - 0018-9545
VL - 67
SP - 7851
EP - 7855
JO - IEEE Transactions on Vehicular Technology
JF - IEEE Transactions on Vehicular Technology
IS - 8
M1 - 8329423
ER -