Performance analysis of hybrid FSO/RF communication over generalized fading models

Vishwakarma, Narendra; Swaminathan, R

doi:10.1016/j.optcom.2021.126796

Cited by 36 publications

(23 citation statements)

References 25 publications

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“…The dual threshold system showed to be similar in performance to a simple hard switching while reducing the number of switches and preserving the FSO subsystem. The performance of the hard-switching approach was further investigated in numerous manuscripts [45], [46]. Authors of [45] studied the performance of a hard-switch-based RF/FSO system over generalized fading models.…”

Section: Multipath Fadingmentioning

confidence: 99%

“…The performance of the hard-switching approach was further investigated in numerous manuscripts [45], [46]. Authors of [45] studied the performance of a hard-switch-based RF/FSO system over generalized fading models. Time hysteresis (TH) and power hysteresis (PH) modifications to the hard-switching approach were studied in [46], where the switching threshold may be variable based on the channel conditions and history.…”

Section: Multipath Fadingmentioning

confidence: 99%

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Retrofitting FSO Systems in Existing RF Infrastructure: A Non-Zero-Sum Game Technology

Trichili¹,

Ragheb

Briantcev

et al. 2021

IEEE Open J. Commun. Soc.

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Progress in optical wireless communication (OWC) has unleashed the potential to transmit data in an ultrafast manner without incurring large investments and bulk infrastructure. OWC includes wireless data transmissions in three optical sub-bands; ultraviolet, visible, and infrared. This paper discusses installing infrared OWC, known as free space optics (FSO), systems on top of installed radio frequency (RF) networks for outdoor applications to benefit from the reliability of RF links and the unlicensed broad optical spectrum, and the large data rates carried by laser beams propagating in free space. We equally review commercially available solutions and the hardware requirements for RF and FSO technology co-existence. The potential of hybrid RF/FSO for space communication is further discussed. Finally, open problems and future research directions are presented.

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Section: Multipath Fadingmentioning

confidence: 99%

Section: Multipath Fadingmentioning

confidence: 99%

Retrofitting FSO Systems in Existing RF Infrastructure: A Non-Zero-Sum Game Technology

Trichili¹,

Ragheb

Briantcev

et al. 2021

IEEE Open J. Commun. Soc.

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“…However, the RF links are not much affected by turbulence, pointing errors, snow, and fog conditions but are susceptible to heavy rainy conditions and multipath fading environment. Therefore, this complementary behaviour of FSO and RF links has led to the development of hybrid FSO/RF systems [16]- [19], where the RF link is used as a backup for the FSO link. In [17]- [19], the performance analysis of a hardswitching-based hybrid FSO/RF system was investigated.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, this complementary behaviour of FSO and RF links has led to the development of hybrid FSO/RF systems [16]- [19], where the RF link is used as a backup for the FSO link. In [17]- [19], the performance analysis of a hardswitching-based hybrid FSO/RF system was investigated. In case of a hard-switching scheme, the FSO sub-system will be used for transmission on a priority basis provided the instantaneous signal-to-noise ratio (SNR) is greater than a predefined threshold SNR.…”

Section: Introductionmentioning

confidence: 99%

“…However, if the instantaneous SNR of the FSO sub-system is unacceptable and below the threshold SNR value, then the backup RF sub-system will be used for transmission and the activation of RF link will be carried out using a single-bit feedback link. In [19], a comprehensive performance analysis of the hard-switching-based hybrid FSO/RF system was carried out using the generalized Malaga and α-η-κ-µ fading distributions with pointing errors. Further, a multi-hop hybrid FSO/RF system based on the hard-switching scheme assuming DF relay was analyzed in [20].…”

Section: Introductionmentioning

confidence: 99%

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On the Capacity Performance of Hybrid FSO/RF System With Adaptive Combining Over Generalized Distributions

Vishwakarma

Swaminathan

2022

IEEE Photonics J.

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This paper investigates the ergodic capacity performance of hybrid free space optics (FSO)/ radio frequency (RF) system by employing an adaptive-combining-based switching scheme. In the adaptive combining scheme, the FSO and RF links are combined using the maximal-ratio combining (MRC) at the output, when the instantaneous signal-to-noise ratio (SNR) of the FSO link drops below a predefined threshold SNR value. The FSO link experiences the atmospheric turbulence, which is modeled using the generalized Malaga distribution, non-zero boresight misalignment or pointing errors, and atmospheric attenuation, under two types of detection techniques, i.e. heterodyne detection (HD) and intensity modulation/direct detection (IM/DD). Similarly, the fading of the RF link is characterized using the generalized κ-µ distribution. In particular, we derive the probability density function (PDF) of the instantaneous SNR of the adaptive combining scheme. Capitalizing on the SNR statistics, we obtain the unified closed-form ergodic capacity expressions for the adaptive-combining-based hybrid FSO/RF system. In addition, the asymptotic expressions for the ergodic capacity of the system at the high-SNR region are presented. All the derived analytical expressions are validated by using Monte-Carlo simulations. Numerical results and discussions are provided to compare the ergodic capacity performance of the adaptive-combining-based hybrid FSO/RF system with the existing system models such as single-link FSO, MRC-based hybrid FSO/RF, and hard-switching-based hybrid FSO/RF systems.

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Image transmission performance analysis through free space optical communication link using coherent QPSK modulation under various environmental conditions

Djir

Meskine

Tayebi

2023

Trans Emerging Tel Tech

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Free space optics (FSO) technology has been used recently in many applications due to its various advantages such as high bandwidth, easy deployment, high security, free installation license and immunity to electromagnetic interference. However, this type of communication is vulnerable to meteorological conditions such as rain, haze and fog which significantly degrade the system's efficiency. To enhance the effectiveness of the FSO systems, Quadrature Phase Shift Keying (QPSK) modulation based on coherent detection constitutes a promising technique for achieving high spectral efficiency and long‐distance FSO links with the characteristics of low‐cost implementation and simple design. This work aims to investigate the performance of FSO communication links on image transmission under the presence of atmospheric attenuations. A comparative study has been made using QPSK modulation scheme and on–off‐keying (OOK) modulation scheme to estimate the maximum range that was used to recover an RGB transmitted image over an FSO link under different meteorological weathers. The obtained results clearly show that the quality of the received image has degraded significantly during transmission through free space yielding to limit the propagation range. Moreover, the proposed FSO communication system performs well when using QPSK modulation rather than OOK modulation in different environmental conditions. Thus, to improve the quality of the received image under adverse fog weather condition, high power and small beam divergence angle have been suggested to increase system's performance. The proposed solution increases the communication range of the FSO link by 230 m and 100 m for moderate and heavy fog, respectively.

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Performance analysis of hybrid FSO/RF communication over generalized fading models

Cited by 36 publications

References 25 publications

Retrofitting FSO Systems in Existing RF Infrastructure: A Non-Zero-Sum Game Technology

Retrofitting FSO Systems in Existing RF Infrastructure: A Non-Zero-Sum Game Technology

On the Capacity Performance of Hybrid FSO/RF System With Adaptive Combining Over Generalized Distributions

Image transmission performance analysis through free space optical communication link using coherent QPSK modulation under various environmental conditions

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