基于LMMSE的相位估计器用于光纤相干扩频FBG传感系统
LMMSE-Based Phase Estimator for Fiber-Optic Coherent Spread-Spectrum FBG-Based Sensing Systems
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中文总结 AI 辅助
本文针对FBG传感系统中的激光相位噪声，提出一种基于线性化和MMSE的相位估计器，其性能接近克拉美-罗下界，能有效补偿相位噪声。
中文摘要 AI 辅助
基于光纤布拉格光栅（FBG）的传感通过跟踪沿光纤插入的FBG反射光的相位变化，实现局部应变和温度监测。此类系统中的一个主要干扰源是激光相位噪声，其影响通常通过额外硬件来缓解。在本文中，我们提出通过数字信号处理来减轻激光相位噪声的影响。我们为相干单偏振扩频FBG传感系统提出了一种实用的估计器，其动机是对复数接收信号进行线性化并近似损失函数，以构建最小均方误差（MMSE）估计问题。此外，我们给出了该FBG估计问题的克拉美-罗下界。我们的仿真结果表明，所提估计器的性能接近克拉美-罗下界，从而表明我们的估计器能有效补偿FBG传感系统中的相位噪声。
英文摘要
Fiber Bragg grating (FBG)-based sensing enables localized strain and temperature monitoring by tracking the phase changes of the light reflected from FBGs inserted along a fiber. A major source of disturbance in such systems is laser phase noise, and its influence is typically mitigated by means of additional hardware. In this article, we propose to mitigate the influence of laser phase noise by means of digital signal processing. We propose a practical estimator for coherent single-polarization spread-spectrum FBG-based sensing systems, which is motivated by linearizing the complex received signal and approximating the loss function to formulate a minimum mean square error (MMSE) estimation problem. Moreover, a Cramer-Rao lower bound for this FBG-based estimation problem is presented. Our simulation results demonstrate that the performance of our proposed estimator lies close to the Cramer-Rao lower bound, thus indicating that our estimator effectively compensates for phase noise in FBG-based sensing systems.
发表机构
- Télécom Paris（巴黎电信学院）
- IP Paris（巴黎理工学院）
- CentraleSupélec（巴黎中央理工-高等电力学院）
机构由 AI 辅助整理，请以论文原文为准。
