弱湍流下逆向调制光通信直流偏置光正交频分复用系统性能分析

doi:10.3969/j.issn.1000-1093.2020.07.014

摘要/Abstract

摘要： 针对现有微机电系统逆向调制器调制速率低、线性区域有限的问题，根据双限幅直流偏置光正交频分复用(DCO-OFDM)的特点，通过DCO-OFDM提高逆向调制光通信的传输速率。将双限幅引起的非线性失真建模为限幅噪声，推导有效信噪比函数；研究地—地和空—空特殊通信条件下，逆向调制光通信中双限幅DCO-OFDM在弱湍流中的理论平均误码率公式，并采用蒙特卡洛法进行仿真，分析对称限幅时直流偏置对性能的影响。结果表明：在较大的光功率下，有效信噪比随着直流偏置的增大，先增大、后减小；较小的直流偏置会造成严重的限幅噪声，限制有效信噪比随光功率变化；该结果对通信链路的设计优化有一定的参考意义。

关键词: 光通信, 逆向调制, 弱湍流, 直流偏置光频分复用, 信噪比, 限幅, 平均误码率

Abstract: The retro-reflect modulator of micro-electro-mechanical system has low modulation rate and limited linear region. To improve the transmission rate effectively, a symmetry clipped DC-biased optical orthogonal frequency division multiplexing (DCO-OFDM) is proposed in the light of DCO-OFDM characteristic. The nonlinear distortion caused by double clipping is modeled as clipping noise, and the effective signal-to-noise ratio function is derived. the theoretical average bit error rate of the double clipping DCO-OFDM of modulated retro-reflector optical communication system in weak turbulence under special communication conditions like ground-ground and air-air is studied and simulated using Monte Carlo method, and the effect of direct current (DC) bias on the performance of symmetric clipping is analyzed. The simulated results show that the effective signal-to-noise ratio increases first and then decreases as the DC bias increases at better optical power. Small DC bias will cause severe clipping noise, thus limiting the change of effective signal-to-noise ratio with optical power. Key

Key words: opticalcommunication, modulatedretro-reflector, weakturbulence, DC-biasedopticalorthogonalfrequencydivisionmultiplexing, signal-to-noiseratio, clipping, averagebiterrorrate

中图分类号:

TN929.12

唐芳，徐智勇，汪井源，赵继勇，李建华. 弱湍流下逆向调制光通信直流偏置光正交频分复用系统性能分析[J]. 兵工学报, 2020, 41(7): 1368-1374.

TANG Fang, XU Zhiyong, WANG Jingyuan, ZHAO Jiyong, LI Jianhua. Performance Analysis of DCO-OFDM in Modulated Retro-reflector Optical Communication over Weak Turbulence[J]. Acta Armamentarii, 2020, 41(7): 1368-1374.

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第41卷第7期2020 年7月
兵工学报ACTA ARMAMENTARII
Vol.41No.7Jul.2020

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