MIMO hybrid FSO/RF system over generalized fading channels

Free-space optics (FSO) communication is often unreliable, especially for long distances, as it suffers from attenuation due to foggy weather, atmospheric turbulence, and pointing errors. To avoid communication link failure, radio frequency (RF) communication, which is unaffected from these effects,...

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Main Authors: Sharma, Shubha, Madhukumar, A. S., Swaminathan, R.
Other Authors: School of Computer Science and Engineering
Format: Article
Language:English
Published: 2022
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Online Access:https://hdl.handle.net/10356/157070
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1570702022-05-02T07:07:26Z MIMO hybrid FSO/RF system over generalized fading channels Sharma, Shubha Madhukumar, A. S. Swaminathan, R. School of Computer Science and Engineering Engineering::Computer science and engineering Multiple-Input-Multiple-Output Communication Radio Frequency Free-space optics (FSO) communication is often unreliable, especially for long distances, as it suffers from attenuation due to foggy weather, atmospheric turbulence, and pointing errors. To avoid communication link failure, radio frequency (RF) communication, which is unaffected from these effects, is utilized when FSO communication is in outage. Diversity is known to counteract the adverse fading effects, therefore, this paper presents a transmit aperture/antenna selection (TAS) and selection combining (SC)-based multiple-input-multiple-output (MIMO) hybrid FSO/RF system. The proposed system consists of a MIMO FSO and RF sub-systems. The MIMO FSO sub-system is given higher priority to transmit and receive using the selected best link. The best link of the MIMO RF sub-system is used when the FSO sub-system is in outage. The probability density function (PDF) and cumulative distribution function (CDF) expressions for TAS/SC-based MIMO FSO and RF sub-systems are derived. The derived PDF and CDF expressions are used further to derive the exact and asymptotic expressions for outage probability, average symbol error rate (SER), and capacity of the hybrid system. From the asymptotic SER expressions, the diversity order of the proposed system is determined. The optimum values for the threshold SNR and transmit beam waist, which minimize the average SER, are obtained. Further, the obtained optimal values using analytical expressions are verified using numerical optimization technique. The effect of multiple apertures/antennas, pointing errors, and atmospheric attenuation over the system performance is analyzed extensively by varying the FSO and RF channel parameters. The results show that the proposed hybrid FSO/RF system is more reliable compared to the individual MIMO FSO and RF systems and achieves higher capacity compared to the MIMO RF system. Ministry of Education (MOE) Submitted/Accepted version . This work was supported by Singapore Ministry of Education Academic Research Fund Tier 1 grant. 2022-05-02T07:07:26Z 2022-05-02T07:07:26Z 2021 Journal Article Sharma, S., Madhukumar, A. S. & Swaminathan, R. (2021). MIMO hybrid FSO/RF system over generalized fading channels. IEEE Transactions On Vehicular Technology, 70(11), 11565-11581. https://dx.doi.org/10.1109/TVT.2021.3111401 0018-9545 https://hdl.handle.net/10356/157070 10.1109/TVT.2021.3111401 2-s2.0-85114749202 11 70 11565 11581 en IEEE Transactions on Vehicular Technology © 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The published version is available at: https://doi.org/10.1109/TVT.2021.3111401. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Computer science and engineering
Multiple-Input-Multiple-Output Communication
Radio Frequency
spellingShingle Engineering::Computer science and engineering
Multiple-Input-Multiple-Output Communication
Radio Frequency
Sharma, Shubha
Madhukumar, A. S.
Swaminathan, R.
MIMO hybrid FSO/RF system over generalized fading channels
description Free-space optics (FSO) communication is often unreliable, especially for long distances, as it suffers from attenuation due to foggy weather, atmospheric turbulence, and pointing errors. To avoid communication link failure, radio frequency (RF) communication, which is unaffected from these effects, is utilized when FSO communication is in outage. Diversity is known to counteract the adverse fading effects, therefore, this paper presents a transmit aperture/antenna selection (TAS) and selection combining (SC)-based multiple-input-multiple-output (MIMO) hybrid FSO/RF system. The proposed system consists of a MIMO FSO and RF sub-systems. The MIMO FSO sub-system is given higher priority to transmit and receive using the selected best link. The best link of the MIMO RF sub-system is used when the FSO sub-system is in outage. The probability density function (PDF) and cumulative distribution function (CDF) expressions for TAS/SC-based MIMO FSO and RF sub-systems are derived. The derived PDF and CDF expressions are used further to derive the exact and asymptotic expressions for outage probability, average symbol error rate (SER), and capacity of the hybrid system. From the asymptotic SER expressions, the diversity order of the proposed system is determined. The optimum values for the threshold SNR and transmit beam waist, which minimize the average SER, are obtained. Further, the obtained optimal values using analytical expressions are verified using numerical optimization technique. The effect of multiple apertures/antennas, pointing errors, and atmospheric attenuation over the system performance is analyzed extensively by varying the FSO and RF channel parameters. The results show that the proposed hybrid FSO/RF system is more reliable compared to the individual MIMO FSO and RF systems and achieves higher capacity compared to the MIMO RF system.
author2 School of Computer Science and Engineering
author_facet School of Computer Science and Engineering
Sharma, Shubha
Madhukumar, A. S.
Swaminathan, R.
format Article
author Sharma, Shubha
Madhukumar, A. S.
Swaminathan, R.
author_sort Sharma, Shubha
title MIMO hybrid FSO/RF system over generalized fading channels
title_short MIMO hybrid FSO/RF system over generalized fading channels
title_full MIMO hybrid FSO/RF system over generalized fading channels
title_fullStr MIMO hybrid FSO/RF system over generalized fading channels
title_full_unstemmed MIMO hybrid FSO/RF system over generalized fading channels
title_sort mimo hybrid fso/rf system over generalized fading channels
publishDate 2022
url https://hdl.handle.net/10356/157070
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