In order to improve the performance of non-orthogonal multiple access (NOMA) system, a downlink NOMA system with two symmetric users is investigated. By noting that the requirement of reliability for these two users is different in some practical transmission scenarios, a performance-controlled max-min relay selection scheme for near-user and far-user is proposed. According to the practical transmission requirements, the outage performance of these two users can be controlled by different settings in the considered system. Considering the influence of the imperfect successive interference cancellation (SIC) in the practical scenarios, the exact outage performance of the far and near users in the system is analyzed, and the approximation results in high signalto-noise ratio are also obtained. Based on the analysis of the approximate results, the optimal power allocation factor for the outage performance of these two users is obtained. Finally, the correctness of the theoretical results is verified by simulation analysis.
杜云海，李恩玉，马隆
. Performance-Controlled Relay Selection for Non-Orthogonal Multiple Access System Under Imperfect Successive Interference Cancellation[J]. Journal of Shanghai Jiaotong University(Science), 2024
, 29(6)
: 1181
-1190
.
DOI: 10.1007/s12204-022-2529-z
[1] TOURKI K, YANG H C, ALOUINI M S. Accurate outage analysis of incremental decode-and-forward opportunistic relaying [J]. IEEE Transactions on Wireless Communications, 2011, 10(4): 1021-1025.
[2] LI E Y, WANG X H, WU Z J, et al. Outage analysis of decode-and-forward two-way relay selection with different coding and decoding schemes [J]. IEEE Systems Journal, 2019, 13(1): 125-136.
[3] SAITO Y, BENJEBBOUR A, KISHIYAMA Y, et al.System-level performance evaluation of downlink nonorthogonal multiple access (NOMA) [C]//2013 IEEE 24th Annual International Symposium on Personal,Indoor, and Mobile Radio Communications. London:IEEE, 2013: 611-615.
[4] DAI L L, WANG B C, YUAN Y F, et al. Nonorthogonal multiple access for 5G: Solutions, challenges, opportunities, and future research trends [J].IEEE Communications Magazine, 2015, 53(9): 74-81.
[5] DING Z G, YANG Z, FAN P Z, et al. On the performance of non-orthogonal multiple access in 5G systems with randomly deployed users [J]. IEEE Signal Processing Letters, 2014, 21(12): 1501-1505.
[6] DING Z G, PENG M G, POOR H V. Cooperative nonorthogonal multiple access in 5G systems [J]. IEEE Communications Letters, 2015, 19(8): 1462-1465.
[7] KIM J B, LEE I H. Non-orthogonal multiple access in coordinated direct and relay transmission [J]. IEEE Communications Letters, 2015, 19(11): 2037-2040.
[8] KADER M F, SHIN S Y. Cooperative relaying using space-time block coded non-orthogonal multiple access [J]. IEEE Transactions on Vehicular Technology, 2017, 66(7): 5894-5903.
[9] KADER M F, SHAHAB M B, SHIN S Y. Exploiting non-orthogonal multiple access in cooperative relay sharing [J]. IEEE Communications Letters, 2017, 21(5): 1159-1162.
[10] DING Z G, DAI H Y, POOR H V. Relay selection for cooperative NOMA [J]. IEEE Wireless Communications Letters, 2016, 5(4): 416-419.
[11] XU P, YANG Z, DING Z G, et al. Optimal relay selection schemes for cooperative NOMA [J]. IEEE Transactions on Vehicular Technology, 2018, 67(8): 7851-7855.
[12] JU J J, DUAN W, SUN Q, et al. Performance analysis for cooperative NOMA with opportunistic relay selection [J]. IEEE Access, 2019, 7: 131488-131500.
[13] SULTAN K. Best relay selection schemes for NOMA based cognitive relay networks in underlay spectrum sharing [J]. IEEE Access, 2020, 8: 190160-190172.
[14] SALEM A, MUSAVIAN L, JORSWIECK E A, et al.Secrecy outage probability of energy-harvesting cooperative NOMA transmissions with relay selection [J]. IEEE Transactions on Green Communications and Networking, 2020, 4(4): 1130-1148.
[15] LIANG X S, WU Y P, NG D W K, et al. Outage probability of cooperative NOMA networks under imperfect CSI with user selection [J]. IEEE Access, 2020,8: 117921-117931.
[16] CHOI Y, PARK C S, KIM D. Asymptotic capacity allocation for an out-of-cell user in non-orthogonal multiple access with coordinated direct and relay transmission [J]. IEEE Access, 2020, 8: 198950-198963.
[17] LI G X, MISHRA D, HU Y L, et al. Adaptive relay selection strategies for cooperative NOMA networks with user and relay cooperation [J]. IEEE Transactions on Vehicular Technology, 2020, 69(10): 11728-11742.
[18] WU C, JIANG H, SHI F R, et al. Achievable rate of NOMA-based DF relaying system with imperfect SIC over imperfect estimation of κ-μ shadowed fading channels [J]. IEEE Communications Letters, 2021,25(7): 2171-2175.
[19] MOUNI N S, KUMAR A, UPADHYAY P K. Adaptive user pairing for NOMA systems with imperfect SIC [J].IEEE Wireless Communications Letters, 2021, 10(7):1547-1551.
