Effect of Random Misalignment in the Capacity of Millimeter-Wave OAM
Since the discovery of vortex beams by Allen et al., there has been a growing interest in exploring the applications of orbital angular momentum (OAM) in communication. Among all these researches, especially radio frequency (RF) wireless communication based on OAM should be one of the most promising...
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| Format: | Article |
| Language: | English |
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IEEE
2024-01-01
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| Series: | IEEE Open Journal of the Communications Society |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/10418466/ |
| _version_ | 1797302648479678464 |
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| author | Xiangyu Cui Ki-Hong Park Mohamed-Slim Alouini |
| author_facet | Xiangyu Cui Ki-Hong Park Mohamed-Slim Alouini |
| author_sort | Xiangyu Cui |
| collection | DOAJ |
| description | Since the discovery of vortex beams by Allen et al., there has been a growing interest in exploring the applications of orbital angular momentum (OAM) in communication. Among all these researches, especially radio frequency (RF) wireless communication based on OAM should be one of the most promising research topics since the frequency resource is increasingly scarce and OAM can provide us with a new degree of freedom besides frequency, time, and space. In the context of wireless communication, millimeter wave and terahertz communication have gained extensive attention to harness spectrum resources. However, due to the short wavelength at these frequencies, line of sight (LOS) channels dominate. OAM, even in LOS channels, offers an additional degree of freedom compared to conventional multiple input multiple output systems. Yet, there are strict requirements for free-space OAM, one of which is the strict alignment between antenna arrays. To the best of our knowledge, there has not been any work about the capacity analysis of OAM communication under random misalignment. In this article, we obtain accurate closed-form intensity for a given misalignment value for both indoor and outdoor situations. Moreover, based on these intensity formulas, we analyze the average capacity under 2-D Gaussian random misalignment numerically and validate its accuracy by simulation. Besides, we illustrate that the Gauss-Laguerre quadrature can be used to reduce the computation complexity in the real environment. Moreover, we analyze the relationship between the average capacity and system parameters such as the array radii, signal-to-noise ratio, and misalignment distribution standard deviation for both indoor and outdoor situations. At last, we verify our work is also effective for the concentric circular array. This work could be a reference to the implementation of a practical RF OAM communication system. |
| first_indexed | 2024-03-07T23:41:08Z |
| format | Article |
| id | doaj.art-3031ea204d25465c9708c0a8a4acfade |
| institution | Directory Open Access Journal |
| issn | 2644-125X |
| language | English |
| last_indexed | 2024-03-07T23:41:08Z |
| publishDate | 2024-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Open Journal of the Communications Society |
| spelling | doaj.art-3031ea204d25465c9708c0a8a4acfade2024-02-20T00:01:32ZengIEEEIEEE Open Journal of the Communications Society2644-125X2024-01-0151141115410.1109/OJCOMS.2024.336143810418466Effect of Random Misalignment in the Capacity of Millimeter-Wave OAMXiangyu Cui0https://orcid.org/0009-0003-5908-2370Ki-Hong Park1https://orcid.org/0000-0002-6867-4277Mohamed-Slim Alouini2https://orcid.org/0000-0003-4827-1793CEMSE Division, King Abdullah University of Science and Technology, Thuwal, Makkah, Saudi ArabiaCEMSE Division, King Abdullah University of Science and Technology, Thuwal, Makkah, Saudi ArabiaCEMSE Division, King Abdullah University of Science and Technology, Thuwal, Makkah, Saudi ArabiaSince the discovery of vortex beams by Allen et al., there has been a growing interest in exploring the applications of orbital angular momentum (OAM) in communication. Among all these researches, especially radio frequency (RF) wireless communication based on OAM should be one of the most promising research topics since the frequency resource is increasingly scarce and OAM can provide us with a new degree of freedom besides frequency, time, and space. In the context of wireless communication, millimeter wave and terahertz communication have gained extensive attention to harness spectrum resources. However, due to the short wavelength at these frequencies, line of sight (LOS) channels dominate. OAM, even in LOS channels, offers an additional degree of freedom compared to conventional multiple input multiple output systems. Yet, there are strict requirements for free-space OAM, one of which is the strict alignment between antenna arrays. To the best of our knowledge, there has not been any work about the capacity analysis of OAM communication under random misalignment. In this article, we obtain accurate closed-form intensity for a given misalignment value for both indoor and outdoor situations. Moreover, based on these intensity formulas, we analyze the average capacity under 2-D Gaussian random misalignment numerically and validate its accuracy by simulation. Besides, we illustrate that the Gauss-Laguerre quadrature can be used to reduce the computation complexity in the real environment. Moreover, we analyze the relationship between the average capacity and system parameters such as the array radii, signal-to-noise ratio, and misalignment distribution standard deviation for both indoor and outdoor situations. At last, we verify our work is also effective for the concentric circular array. This work could be a reference to the implementation of a practical RF OAM communication system.https://ieeexplore.ieee.org/document/10418466/OAMrandom misalignmentradio frequencycapacity analysis |
| spellingShingle | Xiangyu Cui Ki-Hong Park Mohamed-Slim Alouini Effect of Random Misalignment in the Capacity of Millimeter-Wave OAM IEEE Open Journal of the Communications Society OAM random misalignment radio frequency capacity analysis |
| title | Effect of Random Misalignment in the Capacity of Millimeter-Wave OAM |
| title_full | Effect of Random Misalignment in the Capacity of Millimeter-Wave OAM |
| title_fullStr | Effect of Random Misalignment in the Capacity of Millimeter-Wave OAM |
| title_full_unstemmed | Effect of Random Misalignment in the Capacity of Millimeter-Wave OAM |
| title_short | Effect of Random Misalignment in the Capacity of Millimeter-Wave OAM |
| title_sort | effect of random misalignment in the capacity of millimeter wave oam |
| topic | OAM random misalignment radio frequency capacity analysis |
| url | https://ieeexplore.ieee.org/document/10418466/ |
| work_keys_str_mv | AT xiangyucui effectofrandommisalignmentinthecapacityofmillimeterwaveoam AT kihongpark effectofrandommisalignmentinthecapacityofmillimeterwaveoam AT mohamedslimalouini effectofrandommisalignmentinthecapacityofmillimeterwaveoam |