Performance enhancement of LEO-to-ground FSO systems using All-optical HAP-based relaying

Vu, Minh Q.; Nguyen, Nga T. T.; Pham, Hien T. T.; Dang, Ngoc T.

doi:10.1016/j.phycom.2018.05.004

Cited by 17 publications

(16 citation statements)

References 24 publications

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“…For instance, [160] explores optical HAP-to-LEO links where the reliability of the link degrades at low elevation angles. Similarly, [161] proposes a HAP-based relaying for FSO communication between the ground and LEO satellites. Thanks to the HAP-based relaying, it increases the power gain by 28 dB at BER of 10 −9 [161].…”

Section: Integrated Satellite-hap Communication Networkmentioning

confidence: 99%

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Point-to-Point Communication in Integrated Satellite-Aerial 6G Networks: State-of-the-Art and Future Challenges

Saeed

Dahrouj

Al-Naffouri

et al. 2021

IEEE Open J. Commun. Soc.

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This paper surveys the literature on point-to-point (P2P) links for integrated satellite-aerial networks, which are envisioned to be among the key enablers of the sixth-generation (6G) of wireless networks vision. The paper first outlines the unique characteristics of such integrated large-scale complex networks, often denoted by spatial networks, and focuses on two particular space-air infrastructures, namely, satellites networks and high-altitude platforms (HAPs). The paper then classifies the connecting P2P communications links as satellite-to-satellite links at the same layer (SSLL), satellite-to-satellite links at different layers (SSLD), and HAP-to-HAP links (HHL). The paper surveys each layer of such spatial networks separately, and highlights the possible natures of the connecting links (i.e., radiofrequency or free-space optics) with a dedicated survey of the existing link-budget results. The paper, afterwards, presents the prospective merit of realizing such an integrated satellite-HAP network towards providing broadband services in under-served and remote areas. Finally, the paper sheds light on several future research directions in the context of spatial networks, namely large-scale network optimization, intelligent offloading, smart platforms, energy efficiency, multiple access schemes, distributed spatial networks, and routing. Index Terms-Integrated satellite-aerial networks, spatial networks, satellites, high-altitude platforms, broadband services.

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Section: Integrated Satellite-hap Communication Networkmentioning

confidence: 99%

“…Similarly, [161] proposes a HAP-based relaying for FSO communication between the ground and LEO satellites. Thanks to the HAP-based relaying, it increases the power gain by 28 dB at BER of 10 −9 [161].…”

Section: Integrated Satellite-hap Communication Networkmentioning

confidence: 99%

Point-to-Point Communication in Integrated Satellite-Aerial 6G Networks: State-of-the-Art and Future Challenges

Saeed

Dahrouj

Al-Naffouri

et al. 2021

IEEE Open J. Commun. Soc.

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“…• In prior works, the performance analysis of single-hop [9]- [11] and dual-hop (with HAPS) [12] SATCOM scenarios has been carried out by considering FSO links alone.…”

Section: A Motivationsmentioning

confidence: 99%

“…But aperture averaging scheme helps to improve the FSO link performance only for downlink scenario and not for uplink scenario. The usage of HAPS as a relay for dual-hop FSO-based SATCOM system was proposed in [12] to overcome some of the limitations of singlehop FSO link. Further, HAPS will also play a significant role to support FSO communication due to its unique capabilities such as maneuverability, and adaptive altitude adjustment [13].…”

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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“…It is shown that in clear sky, a data rate of 100Gbps can be obtained. Furthermore, FSO can also be used for interconnecting HAPs and satellites [208], [209], with the system requirements discussed in [208].…”

Section: Backhaul and Inter-platform Communicationmentioning

confidence: 99%

A review of wireless communication using high-altitude platforms for extended coverage and capacity

Arum

Grace

Mitchell

2020

Computer Communications

106

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This paper provides an up-to-date review of wireless communications service provisioning in rural or remote areas from High-Altitude Platforms (HAPs) exploiting cellular radio spectrum. With the recent International Telecommunication Union (ITU) report showing that as much as 74% of the population in Africa, most of which are living in rural areas, do not have access to broadband, this paper focuses on the potential of using HAPs as an alternative to terrestrial systems for wireless communication in rural communities. Considering the typically low user densities in rural areas and the importance of HAP coverage maximization while ensuring harmless coexistence with terrestrial systems in rural areas, this paper explores extending the achievable wireless coverage from a HAP. This takes into consideration the coexistence of a HAP with terrestrial systems using intelligent techniques to dynamically manage radio resources and mitigate interference. Studies have shown that efficient intelligent radio resource and topology management can minimize inter-system interference and ensure coexistence with improved system performance. Potential techniques for coverage extension such as exploiting the spatial characteristics of array antennas, radio environment maps (REMs) and deviceto-device (D2D) communications are discussed. Generally, this paper presents a comprehensive review of significant HAP related studies and their outcomes.

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Performance enhancement of LEO-to-ground FSO systems using All-optical HAP-based relaying

Cited by 17 publications

References 24 publications

Point-to-Point Communication in Integrated Satellite-Aerial 6G Networks: State-of-the-Art and Future Challenges

Point-to-Point Communication in Integrated Satellite-Aerial 6G Networks: State-of-the-Art and Future Challenges

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

A review of wireless communication using high-altitude platforms for extended coverage and capacity

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