NR Enhancements for Downlink MIMO in Rel-18. - Kunpeng Liu; Shijie Cai; Xiang Gao; Xianda Liu; Changzhao Dong; Zhening Zhang; Jin Lian; Jingbo Tan; Leiming Zhang; Min Zhang; Zukang Shen; Shaobo Wang (IEEE Commun. Stand. Mag., 2023)