Analytical Channel Model and Link Design Optimization for Ground-to-HAP Free-Space Optical Communications

Safi, Hossein; Dargahi, Akbar; Cheng, Julian; Safari, Majid

doi:10.1109/jlt.2020.2997806

Cited by 89 publications

(52 citation statements)

References 45 publications

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“…Researchers have proposed the use of spatial and temporal statistics phase features which can be inter-converted for FSOL in [11]. Researchers have used high altitude platforms (HAPs) for high data rate solution with FSOL in [12]. The study of digital coherent combing (DCC) method is to provide high sensitivity signals in minimizing the complexity of the algorithm used for FSOC [13].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Free-space optical link optimization in visible light communication system

Ngene

Thakur

Singh

2022

Journal of Optical Communications

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Free space optical communication is a potential technology that exploits the visible light frequency band for communication. In this paper, a free-space optical link (FSOL) optimization in visible light communication (VLC) is used to improve the channel performance for signal strength and analyze the effect of signal failures in a communication system. The data transmission and reception phenomenon are established using a light-emitting diode (LED) as a carrier at transmitter and photodiode as a detector at the receiver, respectively. The OptiSystem tool uses to optimize the component parameters of this proposed communication system. The bit error rate (BER) analyzer displays the signals as an eye diagram with the challenges of components uncertainty for better signal performance. The optimized components solve the problem encountered transmitting improve and enhance the signals strength. The acceptable eye diagram displayed from the BER analyzer has been resolved as a result of component optimizations by adding and removing noise to ascertain the behavior of the channel. A better signal retrieve by the display of the acceptable eye diagram from the OptiSystem software used. The FSOL components optimization improve the loss of data, weak signal, loss of power, signal failure, and signal errors which guarantee multi-mobile users with the shared signal. OptiSystem software package used to fully characterize the FSOL system.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Free-space optical link optimization in visible light communication system

Ngene

Thakur

Singh

2022

Journal of Optical Communications

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“…Here, the coverage probability of relay-to-destination link and outage performance of source-to-relay link was investigated considering shadowed-Rician fading channel. Recently, outage performance analysis of ground-to-HAPS FSO communication was carried out in [28] assuming log-normal and Gamma-Gamma atmospheric turbulence fading channels with pointing errors. Further, performance of a UAV-to-satellite FSO communication system was studied in [29] and the effect of pointing error and atmospheric turbulence on the BER performance was reported using Monte-Carlo simulations.…”

Section: A Prior Workmentioning

confidence: 99%

“…In addition, only RF communication was considered for dual-hop UAV-based relaying system for SATCOM. Well Investigated [8] Well Investigated [11], [12] FSO SATCOM Well Investigated [9], [20], [21], [26] Moderately Investigated [28],…”

Section: B Motivationsmentioning

confidence: 99%

HAPS-Based Relaying for Integrated Space–Air–Ground Networks With Hybrid FSO/RF Communication: A Performance Analysis

Swaminathan

Sharma

Vishwakarma

et al. 2021

IEEE Trans. Aerosp. Electron. Syst.

125

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Optical wireless communication (OWC) has garnered significant importance to provide gigabit capacity links owing to its unique features. Free space optics (FSO) communication, which is the term used for OWC in outdoor scenario, is a good candidate to establish ground-to-satellite/satellite-to-ground links. Despite of many advantages, FSO communication in uplink is limited by the adverse effects of beam wander beam scintillation, and pointing errors. Therefore, to counteract the limitations, it is wise to backup FSO links with reliable radio frequency (RF) links. In addition, the complementary characteristics exhibited by FSO and RF links to atmospheric effects have paved the way for hybrid FSO/RF communication. In recent years, a growing interest is also witnessed in the research and development of space-air-ground integrated network (SAGIN). This paper aims to fuse FSO and RF technologies for integrated space-air-ground uplink networks utilizing unmanned aerial vehicle (UAV) such as high altitude platform station (HAPS) as a relay station for achieving better reliability. Thus, we propose single-hop and SAGIN-based dual-hop system models for uplink satellite communication with hybrid FSO/RF links and the performance is investigated using analytical and simulation results. In summary, the results show that hybrid FSO/RF systems perform better than the FSO systems in uplink scenario due to backup RF link.

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“…In [21], outage performance and coverage probability of a downlink satellite-aerial-terrestrial system was investigated with RF transmission assuming satellite as a source node, UAV as a relay node, and a group of terrestrial receivers acting as destination nodes. In [22], outage performance of FSO communication between GS and HAPS was analyzed and the FSO link was modelled using log-normal and Gamma-Gamma distributions. Further, bit error rate (BER) performance of FSO communication using Monte-Carlo simulations between UAV and satellite was carried out in [23].…”

Section: Introductionmentioning

confidence: 99%

Adaptive-Combining-Based Hybrid FSO/RF Satellite Communication With and Without HAPS

et al. 2021

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In recent years, a growing interest has been witnessed in the usage of free space optics (FSO) link for satellite communication (SATCOM) scenarios, as it offers much higher data rates up to gigabits per second (Gbps) compared to existing radio frequency (RF) link. However, FSO links are sensitive to beam scintillation and pointing errors. In this paper, we consider a hybrid FSO/RF communication between ground station (GS) and satellite, where the RF link will act as a backup link to improve the reliability of FSO communication. In addition, we also consider high-altitude platform station (HAPS), which will act as a relay station, between GS and satellite to improve the end-to-end system performance. This has led to the development of space-air-ground integrated hybrid FSO/RF SATCOM networks. We analyse the performance of the proposed hybrid network considering an adaptive-combining-based switching scheme for both uplink and downlink scenarios with and without using HAPS as a relay station. In case of adaptivecombining-based switching scheme, the data is continuously transmitted over the FSO link, while maximalratio-combining (MRC) of RF and FSO links is performed when the quality of FSO link deteriorates. The performance analysis of adaptive-combining-based switching scheme in terms of outage and average symbol error rate (SER) is carried out and the same is compared with the single-link FSO SATCOM and single-threshold-based switching scheme proposed in the literature for hybrid FSO/RF SATCOM. In addition, the performance gain obtained by the proposed adaptive combining scheme over single-link FSO system for different channel conditions is also reported. Further, the asymptotic analysis is also carried out to obtain the diversity gain of the proposed system.INDEX TERMS Adaptive combining, free space optics, high-altitude platform station (HAPS), hybrid FSO/RF, performance analysis.

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Analytical Channel Model and Link Design Optimization for Ground-to-HAP Free-Space Optical Communications

Cited by 89 publications

References 45 publications

Free-space optical link optimization in visible light communication system

Free-space optical link optimization in visible light communication system

HAPS-Based Relaying for Integrated Space–Air–Ground Networks With Hybrid FSO/RF Communication: A Performance Analysis

Adaptive-Combining-Based Hybrid FSO/RF Satellite Communication With and Without HAPS

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