单波段ROF前传系统非线性建模技术研究
发布时间：2019-06-16 13:58
【摘要】：为了满足人们对高速数据通信的需求,光载无线通信技术应运而生。光载无线通信以其高宽带传输,大容量,抗干扰性强,价格实惠,无线接入灵活的特点,受到人们的广泛关注。然而,光载无线通信系统,在大动态范围OFDM调制信号作用下ROF链路存在较强的动态非线性失真,从而影响系统的功率效率和通信质量。另外,射频功放作为无线通信系统的关键设备,其同样存在较强的静态和动态非线性失真。因而无论是ROF链路,还是射频功放都存在强非线性失真,都需要消除和抑制非线性失真。传统方法将ROF链路和功放分开进行线性化,造成系统结构复杂。因而,迫切需要将ROF链路和功放作为整体进行非线性建模和线性化研究。本文主要对现有功放相关线性化技术以及ROF技术作一些介绍。通过实验模拟通信的方式,搭建包括ROF链路,功率放大器在内的ROF前传系统。在对ROF链路上的非线性,以及对功放的非线性进行研究和分析。通过现有的线性化技术以,应用MATLAB, Toolkit软件,数字预失真的相关模型进行建模,通过对比模型间系数数量,数据训练复杂度,建模精度(NMSE),来比较建模效果。结果表明使用并行两厢模型适用于OFDM这种较大动态范围的LTE信号的非线性建模。在ROF链路系统的非线性所建立的模型中,精度有所改进,对比广义记忆多项式多项式模型在系数数量上减少了42%,从而降低了复杂度。
[Abstract]:In order to meet the needs of high-speed data communication, optical wireless communication technology emerges as the times require. Optical wireless communication has attracted extensive attention because of its high broadband transmission, large capacity, strong anti-interference, affordable, flexible wireless access. However, in the optical wireless communication system, the ROF link has strong dynamic nonlinear distortion under the action of large dynamic range OFDM modulation signal, which affects the power efficiency and communication quality of the system. In addition, as the key equipment of wireless communication system, RF power amplifier also has strong static and dynamic nonlinear distortion. Therefore, both ROF links and RF amplifiers have strong nonlinear distortion, which needs to be eliminated and suppressed. The traditional method linearizes the ROF link and the power amplifier separately, which leads to the complexity of the system structure. Therefore, it is urgent to study the nonlinear modeling and linearization of ROF link and power amplifier as a whole. In this paper, the existing power amplifier related linearization technology and ROF technology are introduced. Through the experimental simulation of communication, the ROF pretransmission system, including ROF link and power amplifier, is built. The nonlinear of ROF link and the nonlinear of power amplifier are studied and analyzed. Through the existing linearization technology, the related models of digital predistortion are used to model with MATLAB, Toolkit software, and the modeling effects are compared by comparing the number of coefficients between models, the complexity of data training and the modeling accuracy of (NMSE),. The results show that the parallel two-box model is suitable for nonlinear modeling of LTE signals in a large dynamic range, such as OFDM. In the nonlinear model of ROF link system, the accuracy is improved, and the number of coefficients is reduced by 42%, thus the complexity is reduced.
【学位授予单位】：云南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN929.5
本文编号：2500615
[Abstract]:In order to meet the needs of high-speed data communication, optical wireless communication technology emerges as the times require. Optical wireless communication has attracted extensive attention because of its high broadband transmission, large capacity, strong anti-interference, affordable, flexible wireless access. However, in the optical wireless communication system, the ROF link has strong dynamic nonlinear distortion under the action of large dynamic range OFDM modulation signal, which affects the power efficiency and communication quality of the system. In addition, as the key equipment of wireless communication system, RF power amplifier also has strong static and dynamic nonlinear distortion. Therefore, both ROF links and RF amplifiers have strong nonlinear distortion, which needs to be eliminated and suppressed. The traditional method linearizes the ROF link and the power amplifier separately, which leads to the complexity of the system structure. Therefore, it is urgent to study the nonlinear modeling and linearization of ROF link and power amplifier as a whole. In this paper, the existing power amplifier related linearization technology and ROF technology are introduced. Through the experimental simulation of communication, the ROF pretransmission system, including ROF link and power amplifier, is built. The nonlinear of ROF link and the nonlinear of power amplifier are studied and analyzed. Through the existing linearization technology, the related models of digital predistortion are used to model with MATLAB, Toolkit software, and the modeling effects are compared by comparing the number of coefficients between models, the complexity of data training and the modeling accuracy of (NMSE),. The results show that the parallel two-box model is suitable for nonlinear modeling of LTE signals in a large dynamic range, such as OFDM. In the nonlinear model of ROF link system, the accuracy is improved, and the number of coefficients is reduced by 42%, thus the complexity is reduced.
【学位授予单位】：云南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN929.5
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