title: Multipath Effects in Millimetre-Wave Wireless Communication using Orbital Angular Momentum Multiplexing.
abstract: Electromagnetic waves carrying orbital angular momentum (OAM) have been used for mode division multiplexing in free-space communication systems to increase both the capacity and the spectral efficiency. In the case of conventional wireless communication links using non-OAM beams, multipath effects caused by beam spreading and reflection from the surrounding objects affect the system performance. This paper presents the results of analysis, simulations, and measurements of multipath effects in a millimetre-wave communication link using OAM multiplexing at 28 GHz. Multipath-induced intra- and inter-channel crosstalk, which are caused by specular reflection from a plane parallel to the propagation path, are analysed and measured. Both the simulation and the experimental results show that an OAM channel with a high OAM number ℓ tends to suffer from both strong intra-channel crosstalk and strong inter-channel crosstalk with other OAM channels. Results of the analysis show that this observation can be explained on the basis of both the properties of OAM beam divergence and the filtering effect at the receiver, which is associated with the spiral wavefront of OAM beams.
authors.affiliation: Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
authors.forename: Yan
authors.initials: Y
authors.lastname: Yan
authors.affiliation: Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
authors.forename: Long
authors.initials: L
authors.lastname: Li
authors.affiliation: Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
authors.forename: Guodong
authors.initials: G
authors.lastname: Xie
authors.affiliation: Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
authors.forename: Changjing
authors.initials: C
authors.lastname: Bao
authors.affiliation: Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
authors.forename: Peicheng
authors.initials: P
authors.lastname: Liao
authors.affiliation: Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
authors.forename: Hao
authors.initials: H
authors.lastname: Huang
authors.affiliation: Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
authors.forename: Yongxiong
authors.initials: Y
authors.lastname: Ren
authors.affiliation: Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
authors.forename: Nisar
authors.initials: N
authors.lastname: Ahmed
authors.affiliation: Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Zhao
authors.affiliation: Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Wang
authors.affiliation: NxGen Partners, Dallas, TX 75219, USA.|University of Texas at Dallas, Richardson, TX, 75080, USA.
authors.forename: Nima
authors.initials: N
authors.lastname: Ashrafi
authors.affiliation: NxGen Partners, Dallas, TX 75219, USA.
authors.forename: Solyman
authors.initials: S
authors.lastname: Ashrafi
authors.affiliation: Intel Labs, Intel Corporation, Santa Clara, 95054, USA.
authors.forename: Shilpa
authors.initials: S
authors.lastname: Talwar
authors.affiliation: Intel Labs, Intel Corporation, Santa Clara, 95054, USA.
authors.forename: Soji
authors.initials: S
authors.lastname: Sajuyigbe
authors.affiliation: School of Electrical Engineering, Tel Aviv University, Ramat Aviv, 69978, Israel.
authors.forename: Moshe
authors.initials: M
authors.lastname: Tur
authors.affiliation: Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
authors.forename: Andreas F
authors.initials: AF
authors.lastname: Molisch
authors.affiliation: Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
authors.forename: Alan E
authors.initials: AE
authors.lastname: Willner