2018/07/10 by Donghong Cai, Cai, Donghong, Zhiguo Ding +5
Computer Science · Engineering · Mathematics · Medicine · #Advanced Wireless Communication Technologies #FOS: Computer and information sciences #Information Theory (cs.IT) #Optical Wireless Communication Technologies #Retinal Imaging and Analysis #cs.IT #math.IT
paper · pdf · doi:10.48550/arxiv.1807.03745
arxiv created 2018/07/10 · openalex publication_date 2018/07/10 · arxiv updated 2018/07/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this paper, we investigate the outage performance of hybrid automatic repeat request with chase combining (HARQ-CC) assisted downlink non-orthogonal multiple access (NOMA) systems. A closed-form expression of the individual outage probability and the diversity gain are obtained firstly. Based on the developed analytical outage probability, a tradeoff between the minimum number of retransmissions and the transmit power allocation coefficient is then provided for a given target rate. The provided simulation results demonstrate the accuracy of the developed analytical results. Moreover, it is shown that NOMA combined with the HARQ-CC can achieve a significant advantage when only average channel state information is known at the transmitter. Particularly, the performance of the user with less transmit power in NOMA systems can be efficiently improved by utilizing HARQ-CC.