Q-Learning-Based Raptor10 Code Decoding Strategy in Free-Space Optical Communication

Fig. 5. Effect of αQ on decoding performances of R10+QL under different turbulence conditions. (a) Average redundant symbol number when σI2=0.1; (b) average redundant symbol number when σI2=0.8; (c) average redundant symbol number when σI2=1.5; (d) average bit error rate when σI2=0.1; (e) average bit error rate when σI2=0.8; (f) average bit error rate when σI2=1.5

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Fig. 6. Effect of βQ on decoding performances of R10+QL under different turbulence conditions. (a) Average redundant symbol number when σI2=0.1; (b) average redundant symbol number when σI2=0.8; (c) average redundant symbol number when σI2=1.5; (d) average bit error rate when σI2=0.1; (e) average bit error rate when σI2=0.8; (f) average bit error rate when σI2=1.5

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Fig. 7. Effect of γQ on decoding performances of R10+QL under different turbulence conditions. (a) Average redundant symbol number when σI2=0.1; (b) average redundant symbol number when σI2=0.8; (c) average redundant symbol number when σI2=1.5; (d) average bit error rate when σI2=0.1; (e) average bit error rate when σI2=0.8; (f) average bit error rate when σI2=1.5

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Table 1. An example of Q table in Raptor10 code decoding strategy

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Table 1. An example of Q table in Raptor10 code decoding strategy

State	Element value
State	A₀∶e'=10	A₁∶e'=11	A₂∶e'=12	A₃∶e'=13
S₀∶μ_Q∈[0,9), $\begin{matrix} σ_{Q}^{2} \end{matrix}$ ∈[0,350)	Q(0,0)	Q(0,1)	Q(0,2)	Q(0,3)
S₁∶μ_Q∈[9,10), $\begin{matrix} σ_{Q}^{2} \end{matrix}$ ∈[350,400)	Q(1,0)	Q(1,1)	Q(1,2)	Q(1,3)
S₂∶μ_Q∈[10,11), $\begin{matrix} σ_{Q}^{2} \end{matrix}$ ∈[400,450)	Q(2,0)	Q(2,1)	Q(2,2)	Q(2,3)
S₃∶μ_Q∈[11,+∞), $\begin{matrix} σ_{Q}^{2} \end{matrix}$ ∈[450,∞)	Q(3,0)	Q(3,1)	Q(3,2)	Q(3,3)

Table 2. Parameters of decoding algorithms
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Table 2. Parameters of decoding algorithms
Strategy Parameter
η α_Q β_Q γ_Q β
R10+QL 0.8 0.6 0.1 0.25 —
R10+LF — — — — 0.05

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Ao Jun, Liang Jiwei, Ma Chunbo, Cao Guixing, Li Cong, Shen Yufei. Q-Learning-Based Raptor10 Code Decoding Strategy in Free-Space Optical Communication[J]. Chinese Journal of Lasers, 2017, 44(9): 906007

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