FSO/RF hybrid link transmission rate optimization method through UAV relay

Long SHAO; Yongjun LI; Xin LI; Meng WANG; Xinkang SONG; Hanling TANG; Shanghong ZHAO

doi:10.5768/JAO202344.0508003

Journal of Applied Optics, Volume. 44, Issue 5, 1142(2023)

FSO/RF hybrid link transmission rate optimization method through UAV relay

Long SHAO1,*... Yongjun LI1, Xin LI1, Meng WANG2, Xinkang SONG1, Hanling TANG1 and Shanghong ZHAO1 |Show fewer author(s)

Author Affiliations

¹College of Information and Navigation, Air Force Engineering University, Xi'an 710077, China

²Unit 93658 of PLA, Beijing 100000, China

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Abstract Get PDF(in Chinese)

Figures & Tables(15)

Fig. 1. System model of FSO/RF communication link

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Fig. 2. Schematic diagram of beam offset between detector and signal light at receiving end

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Fig. 3. Top view of motion trajectories of UAV and ground user (with visibility of 1.0 km)

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Fig. 4. Comparison of transmit rate and distance between UAV and base station (with visibility of 1.0 km)

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Fig. 5. Top view of motion trajectories of UAV and ground user (with visibility of 1.4 km)

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Fig. 6. Comparison of transmit rate and distance between UAV and base station (with visibility of 1.4 km)

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Fig. 7. Comparison of transmission rate and distance between UAV/ground user center and base station (with visibility of 0.5 km)

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Fig. 8. FSO channel transmission rate varies with UAV distance (with visibility of 0.5 km)

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Fig. 9. Top view of motion trajectories of UAV and ground user (with visibility of 1.7 km)

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Fig. 10. Mixed channel communication rate (with visibility of 1.7 km)

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Fig. 11. Convergence diagram under different bandwidths and UAV transmission power settings

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Fig. 12. Comparison of three proposed schemes

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Table 1. Flow of algorithm

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Table 1. Flow of algorithm

Algorithm joint optimization
1.　Define the accuracy tolerance $σ$ . Initialize power ${p_{u, i}^{(0)}}$ , set initial location ${x_{u}^{(0)}, y_{u}^{(0)}, h_{u}}$ ,iteration number t=0
2.　Repeat
3.　Set $p = p_{u, i}^{(t)}$ , solve problem (19), find the optimal location coordinate increment parameters ${δ^{()}, σ^{()},0}$ , update location coordinate $x_{u}^{(t + 1)} = x_{u}^{(t)} + δ^{(t)}$ ， $y_{u}^{(t + 1)} = y_{u}^{(t)} + σ^{(t)}$ ， $h_{u}^{(t + 1)} = h_{u}^{(t)}$
4.　Find optimal power ${p_{u, i}^{()}}$ , update $p_{u, i}^{(t + 1)} = p_{u, i}^{()}$
5.　Update $t + 1 \to t$
6.　Until the objective function converges

Table 2. Parameters setting

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Table 2. Parameters setting

Description	Parameter	Value
RF link parameter	C，D	10，0.6
FSO link bandwidth/ MHz	B_FSO	10
RF link bandwidth/ MHz	B_RF	1
Max UAV power/ dBm	P_u^max	10
Users number	N	5
Convergence parameter	σ	10⁻⁴
RF SNR/ dB	ϒ₀	80
Probability of LoS link	P_LoS	0.9
Wavelength/ nm	λ	1550

Table 3. Average transmission rate under different visibility
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Table 3. Average transmission rate under different visibility
Visibility/km Average transmission rate /Mbps
0.4 1.143
1.0 19.665
1.4 35.958
1.7 39.291

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Long SHAO, Yongjun LI, Xin LI, Meng WANG, Xinkang SONG, Hanling TANG, Shanghong ZHAO. FSO/RF hybrid link transmission rate optimization method through UAV relay[J]. Journal of Applied Optics, 2023, 44(5): 1142

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