Connectivity analysis and user access design of ground-to-air ultraviolet communication networks

Lei Sun; Chen Gong; Zhengyuan Xu

doi:10.1364/JOCN.527611

Journal of Optical Communications and Networking
Vol. 16,
Issue 10,
pp. 1006-1017
(2024)
•https://doi.org/10.1364/JOCN.527611

Connectivity analysis and user access design of ground-to-air ultraviolet communication networks

Lei Sun, Chen Gong, and Zhengyuan Xu

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Lei Sun, Chen Gong, and Zhengyuan Xu, "Connectivity analysis and user access design of ground-to-air ultraviolet communication networks," J. Opt. Commun. Netw. 16, 1006-1017 (2024)

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Abstract

Considering the scattering feature in the ultraviolet (UV) spectrum that can support communication for mobile unmanned aerial vehicles (UAVs), we deploy UAVs equipped with UV communication. Specifically, we focus on ground-to-air UV networks where the UAV collects data from the ground nodes. Assuming that the ground nodes are distributed in two dimensions, we analyze the air-ground connectivity probability. The influence of the transmitter divergence angle on the connectivity probability is investigated. Then, we analyze the probability that there exists interference from multiple nodes. To guarantee reliable communication under such interference, we further propose a handshaking-based UAV access protocol. By solving the coloring problem, we determine the time slot allocation for handshaking and propose a greedy channel allocation method to maximize the average system throughput. Numerical results show the performance gain of the proposed protocol over existing works.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Equations (33)

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Chen Gong	https://orcid.org/0000-0002-7150-0024
Zhengyuan Xu	https://orcid.org/0000-0001-9075-8875

Symbol	Meaning	Value/Unit	Symbol	Meaning	Value/Unit
$n$	Solar background noise	$2 \times 10^{4} c o u n t s / s$	$v$	Speed of the UAV	10 m/s
$P_{T}$	Transmission power	100 mW	$ϕ_{R}$	RX field of view	120°
$η_{r}$	Quantum efficiency of the rate	0.2	$R$	Symbol rate	10 kbps
$η_{f}$	Efficiency of the filter rate	0.1	$A_{r}$	RX receive area	$1.77 {c m}^{2}$
$λ$	Ultraviolet wavelength	266 nm	$R_{0}$	Region radius	1000 m
$k_{s}^{R a y}$	Rayleigh scattering rate	$0.26 {k m}^{- 1}$	$k_{s}^{M i e}$	Mie scattering rate	$0.28 {k m}^{- 1}$
$k_{a}$	Atmospheric absorption rate	$0.80 {k m}^{- 1}$	${B E R}_{t h}$	BER threshold	$10^{- 3}$

Symbol	Meaning	Value/Unit	Symbol	Meaning	Value/Unit
Beacon	Beacon signal	208 bits	RTS	Request to send	214 bits
CTS	Clear to send	134 bits	$T_{g}$	Guard interval	0.1 ms
$T_{p, 1}$	Node processing time	1 ms	$T_{p, 2}$	UAV processing time	1 ms
$P_{k}$	Data frame size	127 bytes	$v$	Speed of the UAV	10 m/s

Symbol	Meaning	Value/Unit	Symbol	Meaning	Value/Unit
$n$	Solar background noise	$2 \times 10^{4} c o u n t s / s$	$v$	Speed of the UAV	10 m/s
$P_{T}$	Transmission power	100 mW	$ϕ_{R}$	RX field of view	120°
$η_{r}$	Quantum efficiency of the rate	0.2	$R$	Symbol rate	10 kbps
$η_{f}$	Efficiency of the filter rate	0.1	$A_{r}$	RX receive area	$1.77 {c m}^{2}$
$λ$	Ultraviolet wavelength	266 nm	$R_{0}$	Region radius	1000 m
$k_{s}^{R a y}$	Rayleigh scattering rate	$0.26 {k m}^{- 1}$	$k_{s}^{M i e}$	Mie scattering rate	$0.28 {k m}^{- 1}$
$k_{a}$	Atmospheric absorption rate	$0.80 {k m}^{- 1}$	${B E R}_{t h}$	BER threshold	$10^{- 3}$

Symbol	Meaning	Value/Unit	Symbol	Meaning	Value/Unit
Beacon	Beacon signal	208 bits	RTS	Request to send	214 bits
CTS	Clear to send	134 bits	$T_{g}$	Guard interval	0.1 ms
$T_{p, 1}$	Node processing time	1 ms	$T_{p, 2}$	UAV processing time	1 ms
$P_{k}$	Data frame size	127 bytes	$v$	Speed of the UAV	10 m/s

Connectivity analysis and user access design of ground-to-air ultraviolet communication networks

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Journal of Optical Communications and Networking