Publication: Publication Date: 2017/07/01 Vol. E100-BNo. 7 ;
pp. 1044-1063 Type of Manuscript: INVITED PAPER (Special Section on Smart Radio and Its Applications in Conjunction with Main Topics of SmartCom) Category: Transmission Systems and Transmission Equipment for Communications Keyword: orbital angular momentum multiplexing, uniform circular array, Gaussian beam, Bessel beam, lens antenna,