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Receiver aperture and multipath effects on power loss and modal crosstalk in a THz wireless link using orbital-angular-momentum multiplexing

The channel capacity of terahertz (THz) wireless communications can be increased by multiplexing multiple orthogonal data-carrying orbital-angular-momentum (OAM) beams. In THz links using OAM multiplexing (e.g., Laguerre-Gaussian [Formula: see text] beams with p = 0), the system performance might de...

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Autores principales: Su, Xinzhou, Zhang, Runzhou, Zhao, Zhe, Song, Hao, Minoofar, Amir, Hu, Nanzhe, Zhou, Huibin, Zou, Kaiheng, Pang, Kai, Song, Haoqian, Lynn, Brittany, Zach, Shlomo, Tur, Moshe, Molisch, Andreas F., Sasaki, Hirofumi, Lee, Doohwan, Willner, Alan E.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9388544/
https://www.ncbi.nlm.nih.gov/pubmed/35982169
http://dx.doi.org/10.1038/s41598-022-18444-w
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author Su, Xinzhou
Zhang, Runzhou
Zhao, Zhe
Song, Hao
Minoofar, Amir
Hu, Nanzhe
Zhou, Huibin
Zou, Kaiheng
Pang, Kai
Song, Haoqian
Lynn, Brittany
Zach, Shlomo
Tur, Moshe
Molisch, Andreas F.
Sasaki, Hirofumi
Lee, Doohwan
Willner, Alan E.
author_facet Su, Xinzhou
Zhang, Runzhou
Zhao, Zhe
Song, Hao
Minoofar, Amir
Hu, Nanzhe
Zhou, Huibin
Zou, Kaiheng
Pang, Kai
Song, Haoqian
Lynn, Brittany
Zach, Shlomo
Tur, Moshe
Molisch, Andreas F.
Sasaki, Hirofumi
Lee, Doohwan
Willner, Alan E.
author_sort Su, Xinzhou
collection PubMed
description The channel capacity of terahertz (THz) wireless communications can be increased by multiplexing multiple orthogonal data-carrying orbital-angular-momentum (OAM) beams. In THz links using OAM multiplexing (e.g., Laguerre-Gaussian [Formula: see text] beams with p = 0), the system performance might degrade due to limited receiver aperture size and multipath effects. A limited-size aperture can truncate the received beam profile along the radial direction. In addition, due to beam divergence, part of the beam might interact with reflectors in the environment, causing the signal to reflect and interfere at the receiver with the directly propagating part of the beam; this is known as the multipath effect. In this paper, we simulate and analyze the impact of both effects on the equality of the THz OAM link by considering a full two-dimensional (2-D) LG modal set. The simulation results show (i) a limited-size receiver aperture can induce power loss and modal power coupling mainly to LG modes with the same ℓ but p > 0 for directly propagated OAM beams; (ii) the multipath effect can induce modal power coupling across multiple 2-D LG modes, which leads to inter-channel coupling among the different channels in an OAM multiplexed link; (iii) the interference between the reflected and direct beams can induce intra-channel coupling between the received signals from the reflected and direct beams; and (iv) beams with a higher OAM order (e.g., from ± 1 to ± 5) or a lower carrier frequency (e.g., from 0.1 to 1 THz) experience larger intra- and inter-channel coupling. The intra- and inter-channel coupling in an OAM-multiplexed THz link can degrade the signal-to-noise ratio (SNR) and induce SNR penalty when compared to a single-channel system.
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spelling pubmed-93885442022-08-20 Receiver aperture and multipath effects on power loss and modal crosstalk in a THz wireless link using orbital-angular-momentum multiplexing Su, Xinzhou Zhang, Runzhou Zhao, Zhe Song, Hao Minoofar, Amir Hu, Nanzhe Zhou, Huibin Zou, Kaiheng Pang, Kai Song, Haoqian Lynn, Brittany Zach, Shlomo Tur, Moshe Molisch, Andreas F. Sasaki, Hirofumi Lee, Doohwan Willner, Alan E. Sci Rep Article The channel capacity of terahertz (THz) wireless communications can be increased by multiplexing multiple orthogonal data-carrying orbital-angular-momentum (OAM) beams. In THz links using OAM multiplexing (e.g., Laguerre-Gaussian [Formula: see text] beams with p = 0), the system performance might degrade due to limited receiver aperture size and multipath effects. A limited-size aperture can truncate the received beam profile along the radial direction. In addition, due to beam divergence, part of the beam might interact with reflectors in the environment, causing the signal to reflect and interfere at the receiver with the directly propagating part of the beam; this is known as the multipath effect. In this paper, we simulate and analyze the impact of both effects on the equality of the THz OAM link by considering a full two-dimensional (2-D) LG modal set. The simulation results show (i) a limited-size receiver aperture can induce power loss and modal power coupling mainly to LG modes with the same ℓ but p > 0 for directly propagated OAM beams; (ii) the multipath effect can induce modal power coupling across multiple 2-D LG modes, which leads to inter-channel coupling among the different channels in an OAM multiplexed link; (iii) the interference between the reflected and direct beams can induce intra-channel coupling between the received signals from the reflected and direct beams; and (iv) beams with a higher OAM order (e.g., from ± 1 to ± 5) or a lower carrier frequency (e.g., from 0.1 to 1 THz) experience larger intra- and inter-channel coupling. The intra- and inter-channel coupling in an OAM-multiplexed THz link can degrade the signal-to-noise ratio (SNR) and induce SNR penalty when compared to a single-channel system. Nature Publishing Group UK 2022-08-18 /pmc/articles/PMC9388544/ /pubmed/35982169 http://dx.doi.org/10.1038/s41598-022-18444-w Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Su, Xinzhou
Zhang, Runzhou
Zhao, Zhe
Song, Hao
Minoofar, Amir
Hu, Nanzhe
Zhou, Huibin
Zou, Kaiheng
Pang, Kai
Song, Haoqian
Lynn, Brittany
Zach, Shlomo
Tur, Moshe
Molisch, Andreas F.
Sasaki, Hirofumi
Lee, Doohwan
Willner, Alan E.
Receiver aperture and multipath effects on power loss and modal crosstalk in a THz wireless link using orbital-angular-momentum multiplexing
title Receiver aperture and multipath effects on power loss and modal crosstalk in a THz wireless link using orbital-angular-momentum multiplexing
title_full Receiver aperture and multipath effects on power loss and modal crosstalk in a THz wireless link using orbital-angular-momentum multiplexing
title_fullStr Receiver aperture and multipath effects on power loss and modal crosstalk in a THz wireless link using orbital-angular-momentum multiplexing
title_full_unstemmed Receiver aperture and multipath effects on power loss and modal crosstalk in a THz wireless link using orbital-angular-momentum multiplexing
title_short Receiver aperture and multipath effects on power loss and modal crosstalk in a THz wireless link using orbital-angular-momentum multiplexing
title_sort receiver aperture and multipath effects on power loss and modal crosstalk in a thz wireless link using orbital-angular-momentum multiplexing
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9388544/
https://www.ncbi.nlm.nih.gov/pubmed/35982169
http://dx.doi.org/10.1038/s41598-022-18444-w
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