基于光脉冲位置调制的异步时钟错位采样数据恢复技术

为提高深空光通信中异步时钟采样信号恢复数据的可靠性, 提出了基于光脉冲位置调制的异步时钟错位采样数据恢复方案。该方案将光子探测器阵列输出信号分为两组, 其中奇数组信号以一定时隙频率进行采样, 偶数组信号延迟半个时隙进行采样, 最后对两组采样信号分别进行合并和插值以完成数据恢复。仿真结果表明：错位采样数据恢复方案的采样性能优于传统采样数据恢复方案, 当以1倍时隙频率采样时, 所提方案能有效减小传统采样方案所带来的信号损失, 抑制时延抖动引起的脉冲移位错误, 系统性能提升效果明显。

Abstract

In order to improve the reliability of asynchronous clock sampling signal recovery data in deep space optical communication, an asynchronous clock delay sampling data recovery scheme based on optical pulse position modulation is proposed. The scheme divides output signals of the photon detector arrays into two groups. The output signals of odd arrays are sampled into a certain slot frequency, and the output signals of even arrays are sampled after half slot sampling. Finally, the two groups of sampling signals are merged and interpolated separately to complete the process of data recovery. The simulation results show that the sampling performance of delay sampling data recovery scheme is better than that of traditional sampling scheme. When the sampling frequency is with one times slot frequency, the proposed scheme can effectively reduce the signal loss caused by the traditional sample mode, and suppress the pulse shift error caused by the delay jitter. The system performance can be improved obviously.

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向劲松, 陈雪莉, 贾元明, 张培. 基于光脉冲位置调制的异步时钟错位采样数据恢复技术[J]. 激光与光电子学进展, 2017, 54(12): 120602. Xiang Jinsong, Chen Xueli, Jia Yuanming, Zhang Pei. Recovery Technique for Asynchronous Clock Delay Sampling Data Based on Optical Pulse Position Modulation[J]. Laser & Optoelectronics Progress, 2017, 54(12): 120602.

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