基于微波光子的带内全双工自干扰消除系统  

RF Self-interference cancellation for in band full duplex system based on microwave photonics

作　　者：李珑[1] 薛小庆[2] 刘婷[2] 陈博[2] LI Long;XUE Xiao-qing;LIU Ting;CHEN Bo(Department of Aeronautical Engineering,Shaanxi Polytechnic Institute,Xianyang 712000,China;School of Physics&Electronic Engineering,Xianyang Normal University,Xianyang 712000,China)

机构地区：[1]陕西工业职业技术学院航空工程学院,陕西咸阳712000 [2]咸阳师范学院物理与电子工程学院,陕西咸阳712000

出　　处：《兰州理工大学学报》2024年第5期105-111,共7页Journal of Lanzhou University of Technology

基　　金：陕西省重点研发计划(2021NY-213);陕西省教育厅科研计划(22JK0598,23JK0711)。

摘　　要：为了突破传统射频自干扰消除技术受频率、带宽、抗电磁干扰等电子瓶颈的限制,满足未来无线通信及雷达系统的发展需求,设计一种基于偏振复用马曾调制器(PDM-MZM)的微波光子自干扰消除方案,通过引入一个与自干扰信号同频、等幅、反相的参考信号在光域与自干扰信号直接抵消.除了具有自干扰消除和下变频功能外,该方案还可用于矢量信号的IQ解调,在IQ解调时灵活调整两路中的偏振控制器,可使IQ两路信号幅度严格相等,相位严格正交,进而消除IQ幅度不均衡对全双工系统接收端的影响.理论分析和仿真测试结果表明,自干扰信号的消除深度可达到72 dB以上,系统的三阶无杂散动态范围可达到95.2 dB·Hz^(2/3),增益为-16.2 dB.该方案具有大带宽、可调谐、抗电磁干扰能力强、体积小、损耗低等优势,在无线通信、雷达系统中具有较大的应用潜力.In order to overcome the limitations of traditional radio frequency self-interference cancellation(SIC)technology due to electronic bottlenecks such as frequency,bandwidth,and resistance to electromagnetic interference,and to meet the development needs of future wireless communication and radar systems,a microwave photonic self-interference cancellation scheme based on polarization multiplexed Mach-Zehnder modulator(PDM-MZM)is proposed.This scheme introduces a reference signal that is of the same frequency,amplitude,and phase as the self-interference signal and directly cancels it in the optical domain.Besides self-interference cancellation and down conversion functions,this scheme can also be used for IQ demodulation of vector signals.During IQ demodulation,the polarization controller in both channels can be flexibly adjusted to make the amplitude of the IQ signals strictly equal and the phase strictly orthogonal,thereby eliminating the impact of IQ amplitude imbalance on the receiving end of the full duplex system.Theoretical analysis and simulation testing were conducted in the article,and the results showed that the elimination depth of self interference signals can reach over 72 dB,and the SFDR of the system can reach 95.2 dB·Hz^(2/3),with a gain of-16.2 dB.This scheme has advantages such as large bandwidth,tunability,strong resistance to electromagnetic interference,small size,and low loss,and has great potential for application in wireless communication and radar systems.

关 键 词：微波光子 自干扰消除 电光调制 消除深度 I/Q解调 

分 类 号：TN29[电子电信—物理电子学]