TY - JOUR
T1 - On Optimal Beamforming Design for Downlink MISO NOMA Systems
AU - Zhu, Jianyue
AU - Wang, Jiaheng
AU - Huang, Yongming
AU - Navaie, Keivan
AU - Ding, Zhiguo
AU - Yang, Luxi
N1 - Funding Information:
Manuscript received June 27, 2019; revised November 19, 2019; accepted January 3, 2020. Date of publication January 14, 2020; date of current version March 12, 2020. This work was supported in part by the National Key R&D Program of China under Grant 2018YFB1800801, in part by the National Natural Science Foundation of China under Grants 61720106003, 61971130, 61571107, and 61711540305, in part by the Research Project of Jiangsu Province under Grants BE2018121 and BK20160069, in part by the UK EPSRC under Grant EP/P009719/2, in part by the H2020-MSCA-RISE-2015 under Grant 690750, in part by the Scientific Research Foundation of Graduate School of Southeast University under Grant YBJJ1817, and in part by the Scholarship from China Scholarship Council under Grant 201806090065. The review of this article was coordinated by Dr. C. Yuen (Corresponding author: Yongming Huang.) J. Zhu, J. Wang, Y. Huang, and L. Yang are with National Mobile Communications Research Laboratory, Southeast University, Nanjing, Jiangsu 210096, China (e-mail: [email protected]; [email protected]; [email protected]; [email protected]).
Publisher Copyright:
© 1967-2012 IEEE.
PY - 2020/3
Y1 - 2020/3
N2 - This work focuses on the beamforming design for downlink multiple-input single-output (MISO) nonorthogonal multiple access (NOMA) systems. The beamforming vectors are designed by solving a total transmission power minimization (TPM) problem with quality-of-service (QoS) constraints. In order to solve the proposed nonconvex optimization problem, we provide an efficient method using semidefinite relaxation. Moreover, for the first time, we characterize the optimal beamforming in a closed form with quasi-degradation condition, which is proven to achieve the same performance as dirty-paper coding (DPC). For the special case with two users, we further show that the original nonconvex TPM problem can be equivalently transferred into a convex optimization problem and easily solved via standard optimization tools. In addition, the optimal beamforming is also characterized in a closed form and we show that it achieves the same performance as the DPC. In the simulation, we show that our proposed optimal NOMA beamforming outperforms OMA schemes and can even achieve the same performance as DPC. Our solutions dramatically simplifies the problem of beamforming design in the downlink MISO NOMA systems and improve the system performance.
AB - This work focuses on the beamforming design for downlink multiple-input single-output (MISO) nonorthogonal multiple access (NOMA) systems. The beamforming vectors are designed by solving a total transmission power minimization (TPM) problem with quality-of-service (QoS) constraints. In order to solve the proposed nonconvex optimization problem, we provide an efficient method using semidefinite relaxation. Moreover, for the first time, we characterize the optimal beamforming in a closed form with quasi-degradation condition, which is proven to achieve the same performance as dirty-paper coding (DPC). For the special case with two users, we further show that the original nonconvex TPM problem can be equivalently transferred into a convex optimization problem and easily solved via standard optimization tools. In addition, the optimal beamforming is also characterized in a closed form and we show that it achieves the same performance as the DPC. In the simulation, we show that our proposed optimal NOMA beamforming outperforms OMA schemes and can even achieve the same performance as DPC. Our solutions dramatically simplifies the problem of beamforming design in the downlink MISO NOMA systems and improve the system performance.
KW - multiple-input single-output
KW - Nonorthogonal multiple access
KW - quality-of-service
KW - quasi-degradation
KW - transmission power minimization
UR - http://www.scopus.com/inward/record.url?scp=85082028961&partnerID=8YFLogxK
U2 - 10.1109/TVT.2020.2966629
DO - 10.1109/TVT.2020.2966629
M3 - Article
AN - SCOPUS:85082028961
SN - 0018-9545
VL - 69
SP - 3008
EP - 3020
JO - IEEE Transactions on Vehicular Technology
JF - IEEE Transactions on Vehicular Technology
IS - 3
M1 - 8959161
ER -