Design of Downlink Synchronization for Millimeter Wave Cellular System Based on Multipath Division Multiple Access. - Kang-Lun Chiu; Pai-Hsiang Shen; Bing-Ru Lin; Wei-Han Hsiao; Shyh-Jye Jou; Chia-Chi Huang (IEEE Trans. Circuits Syst. I Regul. Pap., 2020)