Investigation on Non-Orthogonal Multiple Access with Reduced Complexity Maximum Likelihood Receiver and Dynamic Resource Allocation

Yousuke SANO  Kazuaki TAKEDA  Satoshi NAGATA  Takehiro NAKAMURA  Xiaohang CHEN  Anxin LI  Xu ZHANG  Jiang HUILING  Kazuhiko FUKAWA  

IEICE TRANSACTIONS on Communications   Vol.E100-B   No.8   pp.1301-1311
Publication Date: 2017/08/01
Publicized: 2017/02/08
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2016FGP0024
Type of Manuscript: Special Section PAPER (Special Section on Radio Access Technologies for 5G Mobile Communications System)
Category: Wireless Communication Technologies
non-orthogonal multiple access,  reduced complexity-maximum likelihood receiver,  link to system mapping,  user scheduling,  

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Non-orthogonal multiple access (NOMA) is a promising multiple access scheme for further improving the spectrum efficiency compared to orthogonal multiple access (OMA) in the 5th Generation (5G) mobile communication systems. As inter-user interference cancellers for NOMA, two kinds of receiver structures are considered. One is the reduced complexity-maximum likelihood receiver (R-ML) and the other is the codeword level interference canceller (CWIC). In this paper, we show that the R-ML is superior to the CWIC in terms of scheduling flexibility. In addition, we propose a link to system (L2S) mapping scheme for the R-ML to conduct a system level evaluation, and show that the proposed scheme accurately predicts the block error rate (BLER) performance of the R-ML. The proposed L2S mapping scheme also demonstrates that the system level throughput performance of the R-ML is higher than that for the CWIC thanks to the scheduling flexibility.