TY - JOUR
T1 - Robust Energy-Efficient Design for MISO Non-Orthogonal Multiple Access Systems
AU - Alavi, Faezeh
AU - Cumanan, Kanapathippillai
AU - Fozooni, Milad
AU - Ding, Zhiguo
AU - Lambotharan, Sangarapillai
AU - Dobre, Octavia A.
N1 - Funding Information:
Manuscript received October 27, 2018; revised March 2, 2019 and June 26, 2019; accepted July 19, 2019. Date of publication July 30, 2019; date of current version November 19, 2019. The work of K. Cumanan and Z. Ding was supported by ATOM project H2020-MSCA-RISE-2015 under grant number 690750. The work of Z. Ding was also supported by the UK EPSRC under grant number EP/N005597/2. The work of S. Lambotharan was supported by the UK EPSRC under grant number EP/R006385/1. The work of O. A. Dobre was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC), through its Discovery Program. The associate editor coordinating the review of this article and approving it for publication was C. R. Murthy. (Corresponding author: Faezeh Alavi.) F. Alavi was with the Department of Electronic Engineering, University of York, York YO10 5DD, U.K. She is now with Combitech, Gothenburg, Sweden (e-mail: [email protected]).
Funding Information:
The work of K. Cumanan and Z. Ding was supported by ATOM project H2020-MSCA-RISE-2015 under grant number 690750. The work of Z. Ding was also supported by the UK EPSRC under grant number EP/N005597/2. The work of S. Lambotharan was supported by the UK EPSRC under grant number EP/R006385/1. The work of O. A. Dobre was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC), through its Discovery Program.
Publisher Copyright:
© 1972-2012 IEEE.
PY - 2019/11
Y1 - 2019/11
N2 - Non-orthogonal multiple access (NOMA) has been envisioned as a promising multiple access technique for 5G and beyond wireless networks due to its significant enhancement of spectral efficiency. In this paper, we investigate a robust energy efficiency design for multi-user multiple-input single-output (MISO) NOMA systems, where the imperfect channel state information is available at the base station (BS). A clustering algorithm is applied to group the users into different clusters, and then, the NOMA technique is employed to share the available resources fairly among the users in each cluster. To remove the interference between clusters, two different types of zero-forcing (ZF) designs, namely, hybrid-ZF and full-ZF, are employed at the BS. The full-ZF scheme completely removes the interference leakage at the cost of more number of antennas, and the hybrid-ZF scheme partially mitigates the interference leakage. To solve the problem, Dinkelbach's algorithm is employed to convert the non-linear fractional programming problem into a simple subtractive form. Finally, simulation results reveal that hybrid-ZF outperforms the full-ZF scheme with a few clusters, while full-ZF shows a better performance with higher number of clusters. Numerical results confirm that our proposed robust scheme outperforms the non-robust scheme in terms of the rate-satisfaction ratio at each user.
AB - Non-orthogonal multiple access (NOMA) has been envisioned as a promising multiple access technique for 5G and beyond wireless networks due to its significant enhancement of spectral efficiency. In this paper, we investigate a robust energy efficiency design for multi-user multiple-input single-output (MISO) NOMA systems, where the imperfect channel state information is available at the base station (BS). A clustering algorithm is applied to group the users into different clusters, and then, the NOMA technique is employed to share the available resources fairly among the users in each cluster. To remove the interference between clusters, two different types of zero-forcing (ZF) designs, namely, hybrid-ZF and full-ZF, are employed at the BS. The full-ZF scheme completely removes the interference leakage at the cost of more number of antennas, and the hybrid-ZF scheme partially mitigates the interference leakage. To solve the problem, Dinkelbach's algorithm is employed to convert the non-linear fractional programming problem into a simple subtractive form. Finally, simulation results reveal that hybrid-ZF outperforms the full-ZF scheme with a few clusters, while full-ZF shows a better performance with higher number of clusters. Numerical results confirm that our proposed robust scheme outperforms the non-robust scheme in terms of the rate-satisfaction ratio at each user.
KW - Convex optimization
KW - multiple-input single-output (MISO)
KW - non-orthogonal multiple access (NOMA)
KW - robust energy efficiency (EE)
KW - worst-case performance optimization
KW - zero-forcing (ZF)
UR - http://www.scopus.com/inward/record.url?scp=85075596348&partnerID=8YFLogxK
U2 - 10.1109/TCOMM.2019.2931972
DO - 10.1109/TCOMM.2019.2931972
M3 - Article
AN - SCOPUS:85075596348
SN - 0090-6778
VL - 67
SP - 7937
EP - 7949
JO - IEEE Transactions on Communications
JF - IEEE Transactions on Communications
IS - 11
M1 - 8781935
ER -