Near-Orthogonal Overlay Communications in LoS Channel Enabled by Novel OAM Beams Without Central Energy Voids: An Experimental Study. - Yufei Zhao; Xiaoyan Ma; Yong Liang Guan 001; Yile Liu; Afkar Mohamed Ismail; Xiaobei Liu; Siew Yam Yeo; Chau Yuen (IEEE Internet Things J., 2024)