宽带功率放大器基带数字预失真关键技术研究

发布时间：2018-03-25 12:19

本文选题：功率放大器　切入点：线性化　出处：《国防科学技术大学》2016年博士论文

【摘要】：论文主要探讨了宽带功放线性化矫正中的相关技术问题,在参数化逆模型结构的基带数字预失真方案框架下,着重研究了宽带功放的非线性行为模型,提出了新的用户裁剪模型(CT,Customer Tailored)、次优裁剪模型(SCT,Sub-optimal Customer Tailored)和综合裁剪模型(ICT,Integrated Customer Tailored),并利用仪器平台对新模型的有效性进行了验证。首先,论文对非线性系统常用行为模型进行深入研究,并利用实际信号分析了典型模型的工作特性。研究了Volterra级数模型及简化模型,研究了模型的正交化,将正交化与简化过程相结合,提出了迭代式优选项选择算法(ROS,Recursive Optimum-terms Selecting),该算法按照贡献程度对通用Volterra级数交叉项排序,根据排序结果构建用户裁剪模型(CT),并分析了新模型的精确度、稳定性和适应性。其次,为满足复杂非线性系统建模需要,论文进一步扩展了ROS算法,将简化Voterra级数模型作为ROS算法的基模型,得到适应能力更好的次优裁剪模型(SCT),并通过实际信号分析了该模型的性能特点。论文还研究了分区模型,通过将分区模型与ROS算法相结合,提出了新的综合裁剪模型(ICT),并对该模型的性能特点进行了分析。最后,论文在仪器平台环境下对宽带功放进行了线性化改进实验,通过8PSK和OFDM两种信号分别进行了测试,结果表明所提出的新模型在宽带功放的数字预失真线性化方案中都有较好的表现。
[Abstract]:This paper mainly discusses the related technical problems in the linearization correction of wideband power amplifier. In the framework of the baseband digital predistortion scheme of parametric inverse model structure, the nonlinear behavior model of wideband power amplifier is studied emphatically. In this paper, a new user clipping model is proposed, namely, the customer customer model, the sub-optimal Customer model and the integrated clipping model, and the validity of the new model is verified by means of the instrument platform. Firstly, the commonly used behavior models of nonlinear systems are deeply studied in this paper. The Volterra series model and the simplified model are studied, and the orthogonalization of the model is studied, which combines the orthogonalization with the simplification process. An iterative optimal Optimum-terms selection algorithm is proposed. The algorithm sorts the general Volterra series crossover terms according to the degree of contribution, constructs the user clipping model according to the sorting results, and analyzes the accuracy, stability and adaptability of the new model. In order to meet the needs of modeling complex nonlinear systems, the ROS algorithm is further extended to simplify the Voterra series model as the basic model of the ROS algorithm. The sub-optimal clipping model with better adaptability is obtained, and the performance characteristics of the model are analyzed by the actual signal. The partitioning model is also studied, and the partition model is combined with the ROS algorithm. In this paper, a new integrated clipping model is proposed and its performance is analyzed. Finally, the linearization improvement experiment of wideband power amplifier is carried out under the environment of instrument platform, and the two signals, 8PSK and OFDM, are tested separately. The results show that the proposed new model performs well in the digital predistortion linearization scheme of wideband power amplifier.
【学位授予单位】：国防科学技术大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TN722.75

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