TY - GEN
T1 - Average Power Minimization for Downlink NOMA Transmission with Partial HARQ
AU - Xu, Yanqing
AU - Cai, Donghong
AU - Ding, Zhiguo
AU - Shen, Chao
AU - Zhu, Gang
N1 - Funding Information:
The work of Y. Xu and C. Shen were supported by the Fundamental Research Funds for the Central Universities (No. 2018YJS206), and the NSFC (61871027 and 61725101), Beijing NSF (L172020), and Major projects of Beijing Municipal Science and Technology Commission (Z181100003218010). The work of Z. Ding was supported by the UK Engineering and Physical Sciences Research Council under grant number EP/P009719/1 and by H2020-MSCARISE-2015 under grant number 690750.
Publisher Copyright:
© 2018 IEEE.
PY - 2019/2/19
Y1 - 2019/2/19
N2 - In this paper, we consider the average transmit power minimization problem in a non-orthogonal multiple access (NOMA) system under the strict outage constraints of users. In particular, we assume the base station (BS) only knows the statistical channel state information (CSI) of the users and the users have heterogeneous quality of service requirements. Without loss of generality, we assume user 1 is a delay-aware user with low target rate requirement and user 2 is a delay-tolerant user with high target rate requirement. Due to the high target rate requirement of user 2, it may fail to decode its own information. Thus we proposed a partial hybrid automatic repeat request (HARQ) scheme to guarantee the communication reliability of user 2. By deriving the outage probability of users as closed-form expressions, the average transmit power minimization problem boils down to a nonconvex optimization problem and challenging to solve. We then use a successive convex approximation (SCA) based algorithm to handle the approximated problem iteratively, which can guarantee to converge to at least a stationary point of the problem. The simulation results show the efficacy of the proposed NOMA transmission scheme and SCA-based algorithm.
AB - In this paper, we consider the average transmit power minimization problem in a non-orthogonal multiple access (NOMA) system under the strict outage constraints of users. In particular, we assume the base station (BS) only knows the statistical channel state information (CSI) of the users and the users have heterogeneous quality of service requirements. Without loss of generality, we assume user 1 is a delay-aware user with low target rate requirement and user 2 is a delay-tolerant user with high target rate requirement. Due to the high target rate requirement of user 2, it may fail to decode its own information. Thus we proposed a partial hybrid automatic repeat request (HARQ) scheme to guarantee the communication reliability of user 2. By deriving the outage probability of users as closed-form expressions, the average transmit power minimization problem boils down to a nonconvex optimization problem and challenging to solve. We then use a successive convex approximation (SCA) based algorithm to handle the approximated problem iteratively, which can guarantee to converge to at least a stationary point of the problem. The simulation results show the efficacy of the proposed NOMA transmission scheme and SCA-based algorithm.
KW - Non-orthogonal multiple access
KW - partial hybrid retransmission repeat request
KW - successive convex approximation
UR - http://www.scopus.com/inward/record.url?scp=85063522460&partnerID=8YFLogxK
U2 - 10.1109/GLOCOMW.2018.8644465
DO - 10.1109/GLOCOMW.2018.8644465
M3 - Conference contribution
AN - SCOPUS:85063522460
T3 - 2018 IEEE Globecom Workshops, GC Wkshps 2018 - Proceedings
BT - 2018 IEEE Globecom Workshops, GC Wkshps 2018 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2018 IEEE Globecom Workshops, GC Wkshps 2018
Y2 - 9 December 2018 through 13 December 2018
ER -