光子探测PPM时隙同步中早迟门误差信号的优化技术  

Optimization technique of the early-late gate error signal in photon detection PPM slot synchronization

作　　者：向劲松[1] 张培 陈雪莉 贾元明 XIANG Jingsong;ZHANG Pei;CHEN Xueli;JIA Yuanming(School of Communications and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, Chin)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《光通信技术》2018年第7期1-5,共5页Optical Communication Technology

基　　金：国家自然科学基金(61571072)资助

摘　　要：在深空光通信中,定时误差的存在会影响后续的数据处理过程,为了提高检测定时误差的准确性,实现光脉冲位置调制(PPM)时隙同步的动态实时调整,提出了基于早迟门误差信号优化的光PPM时隙同步技术。该方案在研究利用早迟门提取定时误差的基础上,考虑泊松信道下PPM时隙内存在光子偏移的情况,对定时误差进一步优化,利用反馈原理完成光PPM时隙闭环同步。结果表明,优化后的时隙同步方案不仅能有效抑制误差,而且跟踪精度高、动态应力好,在性能方面远优于未优化的同步方案。In the deep space optical communication, the existence of timing error will affect the subsequent data processing process. In order to improve the accuracy of the detection timing error and realize the real-time adjustment of the optical pulse position modulation（PPM） slot synchronization, this paper proposes an optical PPM slot synchronization technology based on the optimization of early -late gate error signal. On the basis of studying the timing error is extracted with the early-late gate, considering the existence of photon off- sets in PPM slot on poisson channel, the timing error is further optimized. Then the closed loop synchroniza- tion of an optical PPM slot is realized by the feedback principle. The results show that the optimized slot syn- chronization scheme can not only effectively suppress the error, the tracking precision is high and the dynamic stress is good, and the performance is far better than that without the optimization.

关 键 词：光通信 时隙同步 脉冲位置调制 早迟门 优化技术 

分 类 号：TN929.11[电子电信—通信与信息系统]