Publication: IEICE TRANSACTIONS on Communications Publication Date: 2021/09/01 Vol. E104-BNo. 9pp. 1054-1066 Type of Manuscript: Special Section PAPER (Special Section on Technology Trials and Proof-of-Concept Activities for 5G Evolution and Beyond) Category: Keyword: DFT-precoded OFDM, circular QAM, cubic metric, Euclidean distance, frequency domain equalizer,