Abstract
Non-orthogonal multiple access (NOMA) is a promising technique with high spectral efficiency to meet requirements for 5G. This paper mainly introduces key algorithms of NOMA with successive interference cancellation (SIC). Far-UEs and Near-UEs are co-scheduled as a group on the same resource block with different power allocation. To seek a good trade-off between computational complexity and system capacity, an improved method of proportional fair (PF) scheduling with joint Gray-mapping modulation is proposed. The results show that NOMA with SIC significantly enhances the system performance and spectral efficiency compared to conventional orthogonal multiple access (OMA), bringing 22.59% and 21.26% gain in cell average and cell edge throughput respectively. And using the Gray-mapped composite constellation and reducing signalling overhead with the improved pre-fixed power allocation method, which is promote to practical use, brings negligible performance loss.
This work was supported by the Fundamental Research Funds for the Central Universities under Grant 2014ZD03-01, by the National High-Tech R&D Program (863 Program) under Grant 2015AA01A705, by the Special Youth Science Foundation of Jiangxi under Grant 20133ACB21007.
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Guo, J., Lin, X., Bie, Z. (2018). Improved Proportional Fair Scheduling Mechanism with Joint Gray-Mapping Modulation for NOMA. In: Chen, Q., Meng, W., Zhao, L. (eds) Communications and Networking. ChinaCom 2016. Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, vol 209. Springer, Cham. https://doi.org/10.1007/978-3-319-66625-9_35
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DOI: https://doi.org/10.1007/978-3-319-66625-9_35
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