大气湍流信道下的传输系统性能分析
Performance Analysis of Transmission Systems in Atmospheric Turbulent Channels
李傲 1李岩 1孙亚宁 1魏帅 1卢国豪1
作者信息
- 1. 北京邮电大学电子工程学院，北京 100876
- 折叠
摘要
针对星地激光通信链路中大气湍流引起的接收功率快速波动及短时掉光问题，开展了相干接收数字信号处理(DSP)系统的灵敏度动态范围与掉光后重启收敛性能研究。搭建了1.048576 GBaud二进制相移键控(BPSK)相干接收实时DSP实验平台，通过改变接收光功率，测量系统误码率随接收功率变化的特性曲线，完成系统灵敏度测量。引入信噪比系数作为功率变化表征参数，建立其与误码率之间的映射关系，用于判定系统收敛状态。通过可变衰减器与任意波形发生器产生周期性功率波动以及构建湍流模拟装置模拟自由空间信道功率起伏特性。实验结果表明，本相干接收DSP系统在湍流功率抖动信道下具有较强的动态适应能力与快速恢复能力，为后续系统优化提供基础。
Abstract
To address rapid fluctuations in received power and short-term loss of light caused by atmospheric turbulence in satellite-to-ground laser communication links, research was conducted on the sensitivity dynamic range and post-loss-of-light restart convergence performance of coherent reception digital signal processing (DSP) systems. A real-time DSP experimental platform for 1.048576 GBaud binary phase shift keying (BPSK) coherent reception was established. By varying the received optical power, the system sensitivity was measured by recording the characteristic curve of the system bit error rate (BER) versus received power. The signal-to-noise ratio coefficient was introduced as a parameter characterizing power variation, and its mapping relationship with BER was established to determine the system convergence state. Periodic power fluctuations were generated using a variable attenuator and arbitrary waveform generator, while a turbulence simulation device was constructed to mimic free-space channel power variations. Experimental results demonstrate that this coherent reception DSP system exhibits strong dynamic adaptability and rapid recovery capability under turbulent power jitter channels, providing a foundation for subsequent system optimization.关键词
通信技术、星地激光通信、大气湍流、数字信号处理Key words
Communication Technology/Space-GroundLaser Communication/Atmospheric turbulence/Digital Signal Processing引用本文复制引用
李傲,李岩,孙亚宁,魏帅,卢国豪.大气湍流信道下的传输系统性能分析[EB/OL].(2026-02-06)[2026-02-08].http://www.paper.edu.cn/releasepaper/content/202602-47.学科分类
通信/无线通信/光电子技术/电子技术应用
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