【作者】 李琳；

【导师】 文爱军； 陈陵；

【作者基本信息】 西安电子科技大学 ， 电子信息硕士（专业学位）， 2023， 硕士

【摘要】 为了满足人们日益增长的通信需求,具有频谱资源丰富、带宽大和波束窄等优点的毫米波通信成为了国内外学者们的研究热点。但在实际应用中,毫米波通信存在传输损耗高、衰落严重等问题。多输入多输出(MIMO)技术和跳频通信技术均能提高系统的抗衰落性能。因此,在毫米波通信系统中使用MIMO技术和跳频技术能够有效解决毫米波通信信号在传输过程中的衰落问题。现有电子系统受限于“电子瓶颈”,存在工作带宽小、工作频段低等问题,无法满足人们日益增长的通信需求。微波光子技术具有工作带宽大、传输损耗低、体积小、重量轻和抗电磁干扰等优点,已成为了通信、雷达和电子对抗等系统中的常用技术。针对毫米波通信中存在传输损耗高、衰落严重等问题,本文基于微波光子技术,创新性地设计了微波光子MIMO及跳频通信方案,并仿真验证方案的可行性,具体研究内容如下:阐述了现代通信发展的趋势以及毫米波通信的相关需求。文中分析了毫米波通信中存在的问题,介绍了微波光子学、MIMO通信和跳频通信等技术,总结了微波光子MIMO通信系统和跳频信号生成系统的国内外研究现状,说明了典型微波光子器件的物理模型和数学原理。提出了一种双偏振双通道毫米波通信信号生成方案。该方案利用双偏振二进制相移键控(DP-BPSK)调制器将两路射频信号调制到两个偏振态上,利用偏振分束器(PBS)将两个偏振态信号分离,拍频得到两路毫米波通信信号。通过仿真验证,该方案将两路比特率为4 Gbps的16 QAM信号分别上变频到26.5 GHz和27 GHz,并实现了27 d B的通道隔离度。对上变频生成的毫米波通信信号进行解调,解调后的误差矢量幅度(EVM)分别为3.87%和3.76%。提出了一种高谱效四通道毫米波通信信号生成方案。该方案利用双偏振正交相移键控(DP-QPSK)调制器对四路射频信号进行调制,再使用双偏振相干接收机(DPCDR)对偏振复合信号进行相干检测,可同时输出四路毫米波通信信号。通过仿真验证,该方案将四路比特率为4 Gbps的16 QAM信号同时上变频到26 GHz、26.5 GHz、27 GHz和27.5 GHz,并且实现了33 d B的通道隔离度。对系统上变频生成的毫米波通信信号进行解调,解调后的EVM分别为2.82%、2.87%、2.81%和2.88%。提出了一种可调谐双通道宽带跳频信号生成方案。该方案使用DP-QPSK中X偏振态的双平行马赫曾德尔调制器(DPMZM)对两路射频信号进行正交调制。利用周期矩形脉冲信号对Y偏振态上的DPMZM进行直流偏置电压控制,以此生成跳频信号。最后,使用偏振控制器(PC)和PBS进行通道的选择,拍频生成两路宽带跳频信号。其中,每路跳频信号有两个跳频频点,跳频速率由周期矩形脉冲信号的频率决定。通过仿真验证,该方案利用两路比特率为1 Gbps的16 QAM信号,生成了跳频频点为16 GHz/29 GHz和17 GHz/28 GHz、跳频速率为2 MHz的两路宽带跳频信号,系统的通道隔离度为30 d B,解调后的EVM均小于3%。更多还原

【Abstract】 In order to meet the growing communication needs of people,millimeter wave communication,which has advantages such as rich spectrum resources,large bandwidth,and narrow beams,has become a research hotspot for scholars both at home and abroad.However,in practical applications,millimeter wave communication faces problems such as high transmission loss and severe fading.Both Multiple Input Multiple Output(MIMO)technology and Frequency Hopping(FH)communication technology can improve the system’s anti-fading performance.Therefore,using MIMO technology and FH technology in millimeter wave communication systems can effectively solve the problem of signal fading during transmission.Existing electronic systems are limited by "electronic bottlenecks," which have problems such as small operating bandwidth and low operating frequency bands,and cannot meet the growing communication needs of people.Microwave photonics technology has the advantages of large operating bandwidth,low transmission loss,small size,light weight,and electromagnetic interference resistance,and has become a common technology in communication,radar,and electronic warfare systems.In response to the problems of high transmission loss and severe fading in millimeter wave communication,this article innovatively designed a microwave photonics MIMO and FH communication scheme based on microwave photonics technology,and simulated and verified the feasibility of the scheme.The specific research content is as follows:This article elaborates on the trend of modern communication development and the relevant requirements of millimeter wave communication.The article analyzes the problems existing in millimeter wave communication and introduces microwave photonics,MIMO communication,and FH communication technologies.The article summarizes the domestic and foreign research status of microwave photonics MIMO communication systems and FH signal generation systems,and explains the physical model and mathematical principles of typical microwave photonics devices.This article proposes a dual-polarization dual-channel up-conversion millimeter wave communication signal scheme.The scheme uses a dual-polarization Binary Phase Shift Keying(DP-BPSK)modulator to modulate two RF signals onto two polarization states,and uses PBS to separate the two polarization signals and beat to obtain two millimeter wave communication signals.Through simulation verification,the scheme up-converts two 16 QAM signals with bit rates of 4 Gbps to 26.5 GHz and 27 GHz,respectively,and achieves a channel isolation of 27 d B.The demodulated Error Vector Magnitude(EVM)of the upconverted millimeter wave communication signal is 3.87% and 3.76%,respectively.This article proposes a high spectral efficiency four-channel signal millimeter wave upconversion signal transmission scheme.The scheme uses a dual-polarization Quadrature Phase Shift Keying(DP-QPSK)modulator to modulate four RF signals and uses a dualpolarization coherent receiver(DP-CDR)to coherently detect the polarization composite signal,which can simultaneously output four millimeter wave communication signals.Through simulation verification,the scheme simultaneously up-converts four 16 QAM signals with bit rates of 4 Gbps to 26 GHz,26.5 GHz,27 GHz,and 27.5 GHz,respectively,and achieves a channel isolation of 33 d B.The demodulated EVM of the up-converted millimeter wave communication signal is 2.82%,2.87%,2.81%,and 2.88%,respectively.A tunable dual channel wideband frequency hopping signal generation scheme has been proposed.This scheme uses a dual parallel Mach Zender modulator(DPMZM)with Xpolarization in DP-QPSK to perform orthogonal modulation on two RF signals.Using periodic rectangular pulse signals to control the DC bias voltage of DPMZM in the Y polarization state,a frequency hopping signal is generated.Finally,a polarization controller(PC)and PBS are used to select channels and generate two broadband frequency hopping signals through beat frequency.Among them,each frequency hopping signal has two frequency hopping points,and the frequency hopping rate is determined by the frequency of the periodic rectangular pulse signal.Through simulation verification,this scheme utilizes two 16 QAM signals with a bit rate of 1 Gbps to generate two broadband frequency hopping signals with frequency hopping points of 16 GHz/29 GHz and 17 GHz/28 GHz,and a frequency hopping rate of 2 MHz.The channel isolation of the system is 30 d B,and the demodulated EVM is less than 3%.更多还原