TY - JOUR
T1 - Coordinated Direct and Relay Transmission with NOMA and Network Coding in Nakagami-m Fading Channels
AU - Xu, Yao
AU - Li, Bo
AU - Zhao, Nan
AU - Chen, Yunfei
AU - Wang, Gang
AU - Ding, Zhiguo
AU - Wang, Xianbin
N1 - Funding Information:
Manuscript received May 25, 2020; revised August 10, 2020; accepted September 15, 2020. Date of publication September 21, 2020; date of current version January 15, 2021. This work was supported by the National Natural Science Foundation of China under Grant 61671184, Grant 61871065 and Grant 61901137. This article will be presented in part at the 2020 Proceedings of WCSP 2020. The associate editor coordinating the review of this article and approving it for publication was D. B. Da Costa. (Corresponding author: Bo Li.) Yao Xu, Bo Li, and Gang Wang are with the Communication Research Center, Harbin Institute of Technology, Harbin 150001, China (e-mail: [email protected]; [email protected]; [email protected]).
Publisher Copyright:
© 1972-2012 IEEE.
PY - 2021/1
Y1 - 2021/1
N2 - Although the use of coordinated direct and relay transmission (CDRT) in non-orthogonal multiple access (NOMA) can extend the coverage, its duplicated transmission reduces the spectrum efficiency (SE) of NOMA. To improve the SE, we propose a spectrum-efficient scheme for NOMA-based CDRT over Nakagami-m fading channels. In this scheme, the base station (BS) connects with a cell-center user (CCU) directly while communicating with a cell-edge user (CEU) via a relay and the CCU. Then, the relay and the CCU use network coding to process and retransmit the signals sent by the BS first and the CEU later. Finally, the BS and the relay simultaneously broadcast downlink signals. We derive the closed-form expressions for the average SE, the user fairness index and the energy efficiency (EE) as well as the asymptotic average SE using both perfect and imperfect successive interference cancellation (SIC). Simulations verify the correctness of our theoretical analysis and the superiority of the proposed scheme in SE and EE.
AB - Although the use of coordinated direct and relay transmission (CDRT) in non-orthogonal multiple access (NOMA) can extend the coverage, its duplicated transmission reduces the spectrum efficiency (SE) of NOMA. To improve the SE, we propose a spectrum-efficient scheme for NOMA-based CDRT over Nakagami-m fading channels. In this scheme, the base station (BS) connects with a cell-center user (CCU) directly while communicating with a cell-edge user (CEU) via a relay and the CCU. Then, the relay and the CCU use network coding to process and retransmit the signals sent by the BS first and the CEU later. Finally, the BS and the relay simultaneously broadcast downlink signals. We derive the closed-form expressions for the average SE, the user fairness index and the energy efficiency (EE) as well as the asymptotic average SE using both perfect and imperfect successive interference cancellation (SIC). Simulations verify the correctness of our theoretical analysis and the superiority of the proposed scheme in SE and EE.
KW - Coordinated direct and relay transmission
KW - Nakagami-m fading
KW - non-orthogonal multiple access (NOMA)
KW - spectrum efficiency
KW - successive interference cancellation (SIC)
UR - http://www.scopus.com/inward/record.url?scp=85099754060&partnerID=8YFLogxK
U2 - 10.1109/TCOMM.2020.3025555
DO - 10.1109/TCOMM.2020.3025555
M3 - Article
AN - SCOPUS:85099754060
SN - 0090-6778
VL - 69
SP - 207
EP - 222
JO - IEEE Transactions on Communications
JF - IEEE Transactions on Communications
IS - 1
M1 - 9201518
ER -
