Xiang Jingsong, Chen Xueli, Zhang Pei, Jia Yuanming. Clock Synchronization Technology for Pulse Position Modulation with Guard Time at Sampling Frequency of 1 Slot[J]. Chinese Journal of Lasers, 2018, 45(10): 1006003
- Chinese Journal of Lasers
- Vol. 45, Issue 10, 1006003 (2018)
Fig. 1. Timing synchronization structure based on guard time with sampling frequency of 1 slot
Fig. 2. Schematic diagram of timing error with sampling frequency of 1 slot
Fig. 3. Statistical diagram of photon counts. (a) Synchronization; (b) non-synchronization
Fig. 4. Distribution curves of statistical photon counts (σ=0.2, τ0=1.2, γ=50, P=3, M=16, Ks=2, Kb=0.2)
Fig. 5. Fitting diagram of the distribution curves of photon counts
Fig. 6. Timing diagram of signal sampling point and interpolation adjustment point
Fig. 7. Statistics of frequency offset estimation errors under different number of guard time and different statistical data amounts. (a) P=3, N=4×2520; (b) P=2, N=4×2520; (c) P=1, N=4×2520; (d) P=3, N=2×2520; (e) P=3, N=1×2520
Fig. 8. Statistics of estimated initial phase errors under different number of guard time and different statistical data amounts. (a) P=3, N=4×2520; (b) P=1, N=4×2520; (c) P=3, N=1×2520
Fig. 9. Interpolation matching search fine synchronization scheme based on guard time
Fig. 10. Statistical photon count distribution of different frequency offset errors (M=16, P=3, N=2520, Ks=2, Kb=0.2, (τ0)f=0.2 slot, Δγ=-1.8, σ=0.2)
Fig. 11. Statistical photon count distribution of different initial phase fractional offset (M=16, P=3, N=2520, Ks=2, Kb=0.2, (τ0)f=0.2 slot, Δγ=-1.8, σ=0.2)
Fig. 12. Comparison of bit error performance of different methods (N=2520, P=3, Kb=0.2, σ=0.2)
Fig. 13. Bit error performance of different statistics (N=2520, Kb=0.2, σ=0.2)
Fig. 14. Bit error performance of different jitter parameters (Kb=0.2, σ=0.2, P=1)
Fig. 15. Bit error performance under different guard time (N=2520, P=3, Kb=0.2)
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