Block error performance of NOMA with HARQ-CC in finite blocklength

This paper investigates the performance of a two-user downlink non-orthogonal multiple access (NOMA) system using hybrid automatic repeat request with chase combining (HARQ-CC) in finite blocklength. First, an analytical framework is developed by deriving closed-form approximations for the individual average block error rate (BLER) of the near and the far user. Based upon that, the performance of NOMA is discussed in comparison to orthogonal multiple access (OMA), which draws the conclusion that NOMA outperforms OMA in terms of user fairness. Further, an algorithm is devised to determine the required blocklength and power allocation coefficients for NOMA that satisfies reliability targets for the users. The required blocklength for NOMA is compared to OMA, which shows NOMA has a lower blocklength requirement in high transmit signal-to-noise ratio (SNR) conditions, leading to lower latency than OMA when reliability requirements in terms of BLER for the two users are in the order of 10 -5.

Authors:
Marasinghe Dileepa, Rajatheva Nandana, Latva-aho Matti

Publication type:
A4 Article in conference proceedings

Place of publication:
2020 IEEE International Conference on Communications Workshops (ICC Workshops)

Keywords:
block error rate, chase combining, hybrid automatic repeat request, non-orthogonal multiple access, short packet communications, ultra-reliable communications

Published:

Full citation:
D. Marasinghe, N. Rajatheva and M. Latva-Aho, “Block Error Performance of NOMA with HARQ-CC in Finite Blocklength,” 2020 IEEE International Conference on Communications Workshops (ICC Workshops), Dublin, Ireland, 2020, pp. 1-6, doi: 10.1109/ICCWorkshops49005.2020.9145379

DOI:
https://doi.org/10.1109/ICCWorkshops49005.2020.9145379

Read the publication here:
http://urn.fi/urn:nbn:fi-fe2020092275381