Málaga湍流信道下改进型光广义空间调制

doi:10.11959/j.issn.1000-436x.2022200

Abstract

Abstract:

Aiming at the problems of space resource waste and error bit performance limitation caused by fixed optical antenna combination set used in traditional optical generalized spatial modulation (OGSM), an improved scheme based on low complexity adaptive optical antenna combination set selection algorithm was proposed.First, the Euclidean distance matrix between optical antenna combinations was calculated using channel state information.Then, based on the principle of Euclidean distance equivalence and the idea of maximum norm antenna selection, the optical antenna combination with poor channel state was deleted, and the final reserved optical antenna combination was the optimal optical antenna combination set in the current state.The traversal of all optical antenna combinations was avoided and the complexity of the algorithm was reduced to a large extent.The simulation results show that the BER performance of the improved OGSM scheme outperforms the conventional OGSM under different conditions.

Key words: free space optical communication, optical generalized spatial modulation, optical antenna combination set selection, Málaga turbulent channel, pointing error

CLC Number:

TN929.12

Hui ZHAO, Weiwen MA, Jin LI, Wenchao DENG, Hui WAN, Tianqi ZHANG, Yuanni LIU. Improved optical generalized spatial modulation in Málaga turbulent channel[J]. Journal on Communications, 2022, 43(10): 157-166.

Figures/Tables 12

算法	搜索复杂度	计算复杂度
EDAS	$C_{ψ}^{κ} (C_{κ + 1}^{2} - 1) + C_{ψ}^{κ} - 1$	$C_{ψ}^{κ} [κ C_{M}^{2} (N_{r} + 5) +$
		$C_{κ}^{2} M^{2} (6 N_{r} + 1)]$
ACAS	$C_{ψ}^{κ} (C_{κ}^{2} - 1) + C_{κ}^{2} - 1$	$C_{ψ}^{κ} C_{κ}^{2} (3 N_{r} + 3)$
LCED	$\sum_{δ = 0}^{L - 1} ς < O_{LCED}^{sc} <$	$ψ C_{M}^{2} (N_{r} + 5) +$
	$\sum_{δ = 0}^{ψ - κ - 1} (C_{ψ + 1 - δ}^{2} - 1)$	$M^{2} C_{ψ}^{2} (6 N_{r} + 1)$

参数	数值
波长λ/nm	785
FSO链路长度/km	2
1 km处光束半径/m	2.5
光束发散角θ/mrad	2
$ϕ_{A} - ϕ_{B}$	$\frac{π}{2}$
系统光学效率O_eff	0.85
光电探测器的响应度γ	0.5
耦合到视距分量的散射功率量ρ₀	0.597 6

References 23

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算法	N _t =4	N _t =5	N _t =6
EDAS	149	1 619	231 659
ASAC	89	1 259	180 179
LCED	20~34	54~98	183~553

算法	N _t =4	N _t =5	N _t =6
EDAS	39 240	52 340	74 851 920
ASAC	1 350	18 900	2 702 700
LCED	6 324	18 540	42 810

Improved optical generalized spatial modulation in Málaga turbulent channel

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