Performance Analysis of PPM-SNSPD System for Deep Space Optical Communications

IF 8.3 2区计算机科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE Transactions on Communications Pub Date : 2025-01-13 DOI:10.1109/TCOMM.2025.3529220

Ziyuan Shi;Xiaowei Wu;Lei Yang;Yueying Zhan;Derrick Wing Kwan Ng;Qiang Wang

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Abstract

The optical communication system using pulse position modulation (PPM) and superconducting nanowire single-photon detectors (SNSPDs) has attracted considerable attention for deep space applications as it enables high speed data transmission at extremely low average signal power. The deadtime of SNSPD is a critical factor in such systems because it primarily affects the signal detection efficiency. This becomes even more crucial in high-speed systems, where the deadtime can span several symbol periods. We employ the Markov chain model to characterize the high-speed PPM-SNSPD system and investigate its behavior. Analytical expressions for symbol transition probabilities are derived to characterize system-level metrics, including the symbol error rate and achievable code rate. Analysis shows that deadtime introduces memory to the PPM-SNSPD channel, resulting in channel asymmetry. Through experimental verification and simulations, we confirmed the effectiveness of our analysis. In addition, a set of new log-likelihood ratio (LLR) expressions is proposed based on the new model. Compared with the commonly used Poisson LLR expression, our proposed LLR expressions show more than 0.5 dB performance gain.

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深空光通信 PPM-SNSPD 系统性能分析

利用脉冲位置调制（PPM）和超导纳米线单光子探测器（SNSPDs）的光通信系统可以在极低的平均信号功率下实现高速数据传输，在深空应用中引起了广泛的关注。SNSPD的死区时间是影响信号检测效率的关键因素。这在高速系统中变得更加重要，因为死区时间可以跨越几个符号周期。采用马尔可夫链模型对高速PPM-SNSPD系统进行了表征，并对其行为进行了研究。推导了符号转移概率的解析表达式，以表征系统级度量，包括符号错误率和可实现码率。分析表明，死区时间给PPM-SNSPD信道引入了内存，导致信道不对称。通过实验验证和仿真，验证了分析的有效性。在此基础上，提出了一组新的对数似然比（LLR）表达式。与常用的泊松LLR表达式相比，我们提出的LLR表达式的性能提高了0.5 dB以上。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Communications 工程技术-电信学

CiteScore

16.10

自引率

8.40%

发文量

528

审稿时长

4.1 months

期刊介绍： The IEEE Transactions on Communications is dedicated to publishing high-quality manuscripts that showcase advancements in the state-of-the-art of telecommunications. Our scope encompasses all aspects of telecommunications, including telephone, telegraphy, facsimile, and television, facilitated by electromagnetic propagation methods such as radio, wire, aerial, underground, coaxial, and submarine cables, as well as waveguides, communication satellites, and lasers. We cover telecommunications in various settings, including marine, aeronautical, space, and fixed station services, addressing topics such as repeaters, radio relaying, signal storage, regeneration, error detection and correction, multiplexing, carrier techniques, communication switching systems, data communications, and communication theory. Join us in advancing the field of telecommunications through groundbreaking research and innovation.