多维多阶调制技术在光载无线通信系统中的应用研究
发布时间：2018-10-08 11:06
【摘要】：光纤无线通信(RoF)因为融合了无线通信和光纤通信的优势,具有速率高、容量大、接入灵活等特性,是未来宽带无线接入领域的关键技术之一。同时,考虑到采用多维多阶调制方式能够进一步提高频带利用率和降低信号收发成本,因此其在RoF系统中的应用具有重要的理论意义和实用价值。本文分析了几种常用的调制格式(包括归零码/非归零码、相移键控和正交幅度调制)和正交频分复用(OFDM)、离散多音调制(DMT)技术以及脉幅调制(PAM)等若干新型调制格式的基本调制和解调原理;还分析了 RoF系统中电光调制和高频信号解调技术,并介绍了光学外差技术的应用特性;在此基础上,对多维多阶调制技术在RoF系统中的应用展开了应用研究。具体研究内容、仿真或实验研究结果如下:针对RoF系统中多维多阶调制技术的应用进行了相关的理论阐述和实验研究。给出并证明了一种10Gbit/s 4PAM-RoF光接入系统应用方案,搭建的接入系统成功实现了 40km光纤无误码传输;给出并证明了一种60GHz 4/16/64QAM-OFDM RoF光接入系统应用方案,分析比较了采用三种子载波排列方式(相邻、相间、随机)时系统收发和传输信号的特性;给出并证明了一种全双工光生OFDM毫米波接入方案,其中下行链路采用64QAM-OFDM信号,上行链路采用8PSK-OFDM信号,实验结果表明:在下行链路中,当接收光功率为-18dBm时,子载波数为256时,误码率接近10-3 7,接收灵敏度最佳,当上行链路的接收功率高于-28.5dBm时,接收信号的误码率在10 3以下;给出并证明了了一种在光载太赫兹(ToF)接入系统下行链路中传输128QAM-OFDM信号的新方案,实验结果表明,下行传输128QAM-OFDM信号不但能实现较高的频带利用率,而且接收信号误码率(BER)为10-3时其接收机灵敏度值低于-1OdBm;给出并证明了一种以白光.LED灯作为可见光源的室内实时通信方案,实验结果表明,信号接收灵敏度大于-32dB时误码率低于10~(-6)。
[Abstract]:Optical fiber wireless communication (RoF) is one of the key technologies of broadband wireless access in the future because of its advantages of combining wireless communication and optical fiber communication, which has the characteristics of high speed, large capacity and flexible access. At the same time, considering that the multi-dimension and multi-order modulation can further improve the frequency band efficiency and reduce the cost of receiving and transmitting signals, its application in RoF system has important theoretical significance and practical value. In this paper, several common modulation schemes (including return-to-zero code / non-return-to-zero code) are analyzed. Phase shift keying and quadrature amplitude modulation), orthogonal frequency division multiplexing (OFDM),) discrete multitone modulation (DMT) technology, and pulse amplitude modulation (PAM) are the basic principles of modulation and demodulation. The techniques of electro-optic modulation and high-frequency signal demodulation in RoF system are also analyzed, and the application characteristics of optical heterodyne technology are introduced. On the basis of this, the application of multi-dimensional and multi-order modulation technology in RoF system is studied. The specific research contents, simulation and experimental results are as follows: the application of multi-dimensional and multi-order modulation technology in RoF system is discussed theoretically and experimentally. An application scheme of 10Gbit/s 4PAM-RoF optical access system is presented and proved. The 40km optical fiber BER transmission is successfully realized by the constructed access system, and an application scheme of 60GHz 4/16/64QAM-OFDM RoF optical access system is presented and proved. This paper analyzes and compares the characteristics of transceiver and transmission signals using three subcarrier arrangement (adjacent, interphase, random), and gives and proves a full duplex optical generation OFDM millimeter-wave access scheme, in which downlink uses 64QAM-OFDM signal. The uplink uses 8PSK-OFDM signal. The experimental results show that when the received optical power is -18dBm, the BER is close to 10-3.7 when the number of sub-carriers is 256.When the receiving power of uplink is higher than -28.5dBm, The error rate of the received signal is below 103. A new scheme of transmitting 128QAM-OFDM signal in the downlink of light-loaded terahertz (ToF) access system is presented and proved. The experimental results show that the downlink transmission of 128QAM-OFDM signal can not only achieve a higher frequency band utilization, Moreover, when the BER (BER) is 10-3, the receiver sensitivity is lower than -1 OdBm.The paper presents and proves an indoor real-time communication scheme with white light. The experimental results show that the BER is lower than 10 ~ (-6) when the signal reception sensitivity is greater than -32dB.
【学位授予单位】：重庆三峡学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.1
本文编号：2256522
[Abstract]:Optical fiber wireless communication (RoF) is one of the key technologies of broadband wireless access in the future because of its advantages of combining wireless communication and optical fiber communication, which has the characteristics of high speed, large capacity and flexible access. At the same time, considering that the multi-dimension and multi-order modulation can further improve the frequency band efficiency and reduce the cost of receiving and transmitting signals, its application in RoF system has important theoretical significance and practical value. In this paper, several common modulation schemes (including return-to-zero code / non-return-to-zero code) are analyzed. Phase shift keying and quadrature amplitude modulation), orthogonal frequency division multiplexing (OFDM),) discrete multitone modulation (DMT) technology, and pulse amplitude modulation (PAM) are the basic principles of modulation and demodulation. The techniques of electro-optic modulation and high-frequency signal demodulation in RoF system are also analyzed, and the application characteristics of optical heterodyne technology are introduced. On the basis of this, the application of multi-dimensional and multi-order modulation technology in RoF system is studied. The specific research contents, simulation and experimental results are as follows: the application of multi-dimensional and multi-order modulation technology in RoF system is discussed theoretically and experimentally. An application scheme of 10Gbit/s 4PAM-RoF optical access system is presented and proved. The 40km optical fiber BER transmission is successfully realized by the constructed access system, and an application scheme of 60GHz 4/16/64QAM-OFDM RoF optical access system is presented and proved. This paper analyzes and compares the characteristics of transceiver and transmission signals using three subcarrier arrangement (adjacent, interphase, random), and gives and proves a full duplex optical generation OFDM millimeter-wave access scheme, in which downlink uses 64QAM-OFDM signal. The uplink uses 8PSK-OFDM signal. The experimental results show that when the received optical power is -18dBm, the BER is close to 10-3.7 when the number of sub-carriers is 256.When the receiving power of uplink is higher than -28.5dBm, The error rate of the received signal is below 103. A new scheme of transmitting 128QAM-OFDM signal in the downlink of light-loaded terahertz (ToF) access system is presented and proved. The experimental results show that the downlink transmission of 128QAM-OFDM signal can not only achieve a higher frequency band utilization, Moreover, when the BER (BER) is 10-3, the receiver sensitivity is lower than -1 OdBm.The paper presents and proves an indoor real-time communication scheme with white light. The experimental results show that the BER is lower than 10 ~ (-6) when the signal reception sensitivity is greater than -32dB.
【学位授予单位】：重庆三峡学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.1
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