Beam Size Optimization for High-Altitude Platforms to Ground Links in FSO Communications

Truong, Dieu Linh; Dang, Ngoc T.

doi:10.21553/rev-jec.332

Cited by 2 publications

(7 citation statements)

References 8 publications

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Section: Introductionmentioning

confidence: 82%

“…Compared with the previous studies in [9] and [12], the current research differs in two aspects. First, the current research proposes to use multiple serving FSO transceivers on each HAP instead of a single serving FSO transceiver, as in [9] and [12]. Second, the current research identifies the optimal beam widths for serving FSO transceivers, whereas in [9], the beam widths are predefined.…”

Section: Introductionmentioning

confidence: 82%

“…Calculate R ext (α, m, β) using ( 9), (10) return αOpt, mOpt, βOpt 21: end function Following an exhaustive search approach, we examine all possible values of α and m to seek for the pair that minimizes ζ in (24). The search range of α is from 0 • to the maximum Calculate R ext (α, m, β) using ( 9),( 10),(11) (12) 4:…”

Section: Algorithm 1 Find the Optimal Mfso Configurationmentioning

confidence: 99%

“…Algorithm 2 finds the maximum β that satisfies constraint (7) for a given pair of (α, m) by testing the possible values of β increasingly from 0 until the received power P rx J at the border of the extended coverage area reaches the required received power ρ rx . The received power P rx J is calculated using the set of equations ( 6), ( 8), ( 9),( 10), (11), and (12).…”

Section: Algorithm 1 Find the Optimal Mfso Configurationmentioning

confidence: 99%

“…However, for HAP and ground communication, the serving FSO transceiver of the HAP must project a sufficiently wide laser beam to obtain a large footprint. Research in [12] shows that the laser source from HAP should be very powerful for providing such a large ground coverage.…”

Section: Introductionmentioning

confidence: 99%

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Optimal Multiple FSO Transceiver Configuration for Using on High-Altitude Platforms

Truong

Dang

2023

IEEE Access

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Free-space optical (FSO) communication requires light of sight (LoS) between the transmitter and the receiver. For long-distance communication, many research projects have been conducted towards using a network composed of high-altitude platforms (HAPs) flying at an elevation of 20 km to carry intermediate FSO transceivers that forward data between ground stations. The clear environment at high elevations prevents terrestrial obstacles from cutting the LoS between the transceivers. An FSO transceiver on a HAP can communicate with ground stations within a small area owing to its limited beam size. We suggest using multiple FSO transceivers on a HAP to extend its ground coverage. However, the use of too many FSO transceivers may quickly exhaust the onboard energy of the HAP. As a result, HAP must be lowered to recharge frequently. In this study, we first propose a configuration of multiple FSO transceivers to widen the ground coverage of a HAP. We then propose a set of closed-form expressions to calculate the extended coverage. Finally, to implement a HAP network using multiple FSO transceivers, we seek the optimal configuration of multiple FSO transceivers that minimizes the total cost of the HAP network, including amortization, energy, and maintenance costs. The simulation results show that the proposed multiple FSO transceiver configuration can increase four times the ground coverage area of a HAP and significantly reduces the cost of the HAP network.INDEX TERMS Free space optics, high-altitude platform, beam size optimization, HAP based FSO network.

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Section: Introductionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 82%

Section: Algorithm 1 Find the Optimal Mfso Configurationmentioning

confidence: 99%

Section: Algorithm 1 Find the Optimal Mfso Configurationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimal Multiple FSO Transceiver Configuration for Using on High-Altitude Platforms

Truong

Dang

2023

IEEE Access

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Adaptive Beam Divergence Control to Mitigate Scintillation Effect Caused by Pointing Error in Vertical FSO Transmissions

Park

Hyun

Han

2023

Sensors

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Free-space optical (FSO) communication has been studied for next-generation network systems. Because an FSO system establishes point-to-point communication links, maintaining alignment among the transceivers is a critical challenge. In addition, atmospheric turbulence causes significant signal loss in FSO vertical links. Even in clear weather conditions, transmitted optical signals suffer significant scintillation losses due to random variations. Thus, the effect of atmospheric turbulence should be considered in vertical links. In this paper, we analyze the relationship between pointing error and scintillation from the aspect of beam divergence angle. Furthermore, we propose an adaptive beam that optimizes its divergence angle according to the pointing error between the communicating optical transceivers to mitigate the effect of scintillation due to pointing error. We performed a beam divergence angle optimization and compared it with adaptive beamwidth. The proposed technique was demonstrated using simulations, which revealed an enhanced signal-to-noise ratio and the mitigation of the scintillation effect. The proposed technique would be useful in minimizing the scintillation effect in vertical FSO links.

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Beam Size Optimization for High-Altitude Platforms to Ground Links in FSO Communications

Cited by 2 publications

References 8 publications

Optimal Multiple FSO Transceiver Configuration for Using on High-Altitude Platforms

Optimal Multiple FSO Transceiver Configuration for Using on High-Altitude Platforms

Adaptive Beam Divergence Control to Mitigate Scintillation Effect Caused by Pointing Error in Vertical FSO Transmissions

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