TY - GEN
T1 - Outage Analysis and Power Allocation for HARQ-CC Enabled NOMA Downlink Transmission
AU - Xu, Yanqing
AU - Cai, Donghong
AU - Fang, Fang
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 (2018YJS206), NSFC (61501024, 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-MSCA-RISE-2015 under grant number 690750.
Publisher Copyright:
© 2018 IEEE.
PY - 2018
Y1 - 2018
N2 - In this paper, we aim to design a power allocation strategy to minimize the average consumed power of a hybrid automatic repeat request with chase combining (HARQ-CC) enabled system under a strict outage constraint for each user. In particular, the non-orthogonal multiple access (NOMA) is incorporated to further improve the system spectrum efficiency and we assume the base station only knows the statistical channel state information of the users. To evaluate the performance of the HARQ-CC enabled NOMA system, we first analyze the outage probability of each user. Then, based on the derived outage probabilities, by optimizing the transmit power, an average power minimization problem is considered. However, the attained expressions of the outage probabilities are nonconvex and extremely complicated, and thus make the formulated problem difficult to deal with. To efficiently solve the original problem, we first conservatively approximate it by a tractable one and then use a successive convex approximation based algorithm to handle the relaxed problem iteratively. And the presented algorithm can be guaranteed to converge to at least a stationary point of the problem. The simulation results show the efficacy of the proposed transmission strategy and the near-optimality of the proposed approximation approach and algorithm.
AB - In this paper, we aim to design a power allocation strategy to minimize the average consumed power of a hybrid automatic repeat request with chase combining (HARQ-CC) enabled system under a strict outage constraint for each user. In particular, the non-orthogonal multiple access (NOMA) is incorporated to further improve the system spectrum efficiency and we assume the base station only knows the statistical channel state information of the users. To evaluate the performance of the HARQ-CC enabled NOMA system, we first analyze the outage probability of each user. Then, based on the derived outage probabilities, by optimizing the transmit power, an average power minimization problem is considered. However, the attained expressions of the outage probabilities are nonconvex and extremely complicated, and thus make the formulated problem difficult to deal with. To efficiently solve the original problem, we first conservatively approximate it by a tractable one and then use a successive convex approximation based algorithm to handle the relaxed problem iteratively. And the presented algorithm can be guaranteed to converge to at least a stationary point of the problem. The simulation results show the efficacy of the proposed transmission strategy and the near-optimality of the proposed approximation approach and algorithm.
KW - HARQ-CC
KW - NOMA
KW - successive convex approximation
UR - http://www.scopus.com/inward/record.url?scp=85063536834&partnerID=8YFLogxK
U2 - 10.1109/GLOCOM.2018.8647914
DO - 10.1109/GLOCOM.2018.8647914
M3 - Conference contribution
AN - SCOPUS:85063536834
T3 - 2018 IEEE Global Communications Conference, GLOBECOM 2018 - Proceedings
BT - 2018 IEEE Global Communications Conference, GLOBECOM 2018 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2018 IEEE Global Communications Conference, GLOBECOM 2018
Y2 - 9 December 2018 through 13 December 2018
ER -