Broadband Laser Doppler Frequency Shift Emulator for Satellite Laser Communication

Li, Jinye; Yao, Yuan; Wu, Guo-Zhang; Hou, Jiaqing; Yu, Wantai; Liu, Bo; Liu, Jianguo

doi:10.1109/jphot.2019.2956075

Cited by 13 publications

(8 citation statements)

References 13 publications

(11 reference statements)

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“…Due to the relative motion between satellite and HAP, unfortunately, the Doppler effect may affect received signals. Nevertheless, the existing receiver design for optical satellite communication is able to deal with the Doppler frequency shift as reported in [20], [21]. Hence, the effect of Doppler can be negligible in our work.…”

Section: A Satellite-to-hap Fso Linkmentioning

confidence: 91%

On the Design of Rate Adaptation for Relay-Assisted Satellite Hybrid FSO/RF Systems

Nguyen

Dang

et al. 2022

IEEE Photonics J.

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This paper addresses the design of hybrid freespace optical/radio frequency (FSO/RF) systems for a highaltitude platform (HAP)-aided relaying satellite communication for mobile networks supported by unmanned aerial vehicle (UAV). While prior work primarily focused on fixed-rate design, which frequently switches between FSO and RF lead reduced the system performance, we propose a rate adaptation design that gradually adjusts the data rate in each link when its channel state fluctuates, under a target bit error rate (BER) constraint. The proposed design's downlink performance is analyzed, taking into account many challenging issues, including beam spreading loss, cloud attenuation, statistical behaviors of the atmospheric turbulence in the dual-hop channel, and pointing misalignment due to the UAV hovering. Different performance metrics are analytically derived based on channel modelings, including outage probability, average transmission rate, and achievable spectrum efficiency. In addition, the average system BER, which satisfies the design constraint, is also numerically obtained. The results quantitatively confirm the effectiveness of our proposed system under the impact of UAV hovering misalignment and atmospheric-related issues like clouds and turbulence. Finally, Monte-Carlo simulations validate the accuracy of theoretical results.

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Section: A Satellite-to-hap Fso Linkmentioning

confidence: 91%

On the Design of Rate Adaptation for Relay-Assisted Satellite Hybrid FSO/RF Systems

Nguyen

Dang

et al. 2022

IEEE Photonics J.

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“…Besides, as reported in [23], the maximum frequency shift between an LEO satellite and a stable HAP is the order of several GHz. These values are, nonetheless, within the capability of the current receiver design for LEO satellite-based FSO systems (i.e., can deal with frequency shift up to more than 10 GHz [24]). As a result, we ignore the Doppler effect in the performance analysis.…”

Section: A Fso-based Satellite-to-hap Linkmentioning

confidence: 78%

“…where ↵ z and z are respectively the effective number of large-scale and small-scale eddies of scattering environment. From (24), the PDF of h u a can be expressed as…”

Section: Uav-assisted Hap-to-gs Fso Linkmentioning

confidence: 99%

On the Design of RIS-UAV Relay-Assisted Hybrid FSO/RF Satellite-Aerial-Ground Integrated Network

Nguyen

Pham

2022

IEEE Trans. Aerosp. Electron. Syst.

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Satellite-aerial-ground integrated network (SAGIN) has been widely envisioned as a promising network architecture for 6G. In the SAGINs, high altitude platform (HAP)-aided relaying satellite systems using hybrid free-space optics (FSO)/radiofrequency (RF) communications have recently attracted research efforts worldwide. Nevertheless, the main drawback of hybrid FSO/RF systems is the restricted bandwidth of the RF connection, especially when the FSO one is blocked by cloud coverage. This paper explores a novel solution for the hybrid FSO/RF HAPbased SAGIN under the impact of weather and atmospheric conditions. Specifically, an additional unmanned aerial vehicle (UAV) is deployed to diverse the FSO link from the HAP-toground station to avoid cloud blockage while maintaining a highspeed connection of the FSO link. A mirror array constructed by re-configurable intelligent surface (RIS), an emerging technology, is mounted on the UAV to reflect the signals from the HAP. The channel model of RIS-UAV takes into account both atmospheric turbulence and hovering-induced pointing errors. Furthermore, we present a novel link switching design with a multi-rate adaptation scheme for the proposed network under different weather and turbulence conditions. Numerical results quantitatively confirm the effectiveness of our proposal. Additionally, we provide insightful discussions that can be helpful for the practical system design of RIS-UAV-assisted HAP-based SAGIN using hybrid FSO/RF links. Monte Carlo simulations are also performed to validate the accuracy of theoretical derivations.Index Terms-Satellite-aerial-ground integrated network (SA-GIN), high-altitude platform (HAP), unmanned aerial vehicle (UAV), re-configurable intelligent surface (RIS), hybrid FSO/RF links, multi-rate adaptation.

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“…Nevertheless, the existing receiver design for optical satellite communication is able to deal with the Doppler frequency shift as reported in [23], [24]. Hence, the effect of Doppler can be negligible in our work.…”

Section: A Satellite-to-hap Fso Linkmentioning

confidence: 91%

On the Design of Rate Adaptation for Relay-Assisted Satellite Hybrid FSO/RF Systems

Le¹,

Nguyen²

2021

Preprint

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<p>This paper addresses the design of hybrid free-space optical/radio frequency (FSO/RF) systems for a high-altitude platform (HAP)-aided relaying satellite communication for mobile networks supported by unmanned aerial vehicle (UAV). While prior work primarily focused on fixed-rate design, which frequently switches between FSO and RF lead to reduce the system performance, we propose a rate adaptation design that gradually adjusts the data rate in each link when its channel state fluctuates. The proposed design's downlink performance is analyzed, taking into account many challenging issues, including beam spreading loss, cloud attenuation, statistical behaviors of the atmospheric turbulence in the dual-hop channel, and pointing misalignment due to the UAV hovering. Different performance metrics are analytically derived based on channel modelings, such as outage probability, average transmission rate, achievable spectrum efficiency, and average transmission rate. The numerical results quantitatively confirm the effectiveness of our proposed system under the impact of UAV hovering misalignment and atmospheric-related issues like clouds and turbulence. Finally, Monte-Carlo simulations validate the accuracy of theoretical results.</p>

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Broadband Laser Doppler Frequency Shift Emulator for Satellite Laser Communication

Cited by 13 publications

References 13 publications

On the Design of Rate Adaptation for Relay-Assisted Satellite Hybrid FSO/RF Systems

On the Design of Rate Adaptation for Relay-Assisted Satellite Hybrid FSO/RF Systems

On the Design of RIS-UAV Relay-Assisted Hybrid FSO/RF Satellite-Aerial-Ground Integrated Network

On the Design of Rate Adaptation for Relay-Assisted Satellite Hybrid FSO/RF Systems

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