短波功放非线性建模及预失真矫正理论研究与实验验证

项目名称： 短波功放非线性建模及预失真矫正理论研究与实验验证

项目编号： No.61501272

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 许高明

作者单位： 宁波大学

项目金额： 21万元

中文摘要： 短波通信系统作为军队、人民防空及应急抢险等部门保留的最低限度通信手段被广泛应用。而短波功率放大器的谐波失真、互调失真及记忆效应严重制约着它的发展。本项目立足于数字预失真技术，拟建立一种能够同时表征短波功放谐波失真、互调失真及记忆效应等非线性的行为模型，并根据该模型研究适用于矫正这些非线性的数字预失真器。为了降低谐波捕获对模/数转换芯片采样速率的需求，本项目拟提出一种“谐波聚合”方法，在低采样率条件下最大限度地捕获高次谐波。另外，课题组拟将前期提出的广义串行两厢式模型和广义改进型Hammerstein模型扩展为多维度模型以表征谐波及其附近的互调失真和记忆效应，并建立数字预失真器对短波功放进行非线性矫正仿真和实验验证。本项目研究内容将为新一代短波通信系统的研发和现有系统的优化解决关键技术问题，为国防、应急抢险、海洋战略等奠定坚实基础，同时为多波段多模式功放非线性建模及矫正提供重要的参考价值。

中文关键词： 短波功率放大器；非线性校正；数字预失真；谐波失真；记忆效应

英文摘要： As a means of reserved minimal communication, the short-wave (SW) communication system is widely used in the department of the army, civil air defense, emergency rescue, and so on. However, the harmonic distortions, inter-modulation distortions and the memory effects of the short-wave power amplifier (SWPA) restrict its development severely. Based on the technology of digital pre-distortion, the project attempts to build a nonlinear behavioral model which is able to characterize the harmonic distortions, inter-modulation distortions and memory effects of the SWPA simultaneously and design one digital pre-distorter for correcting these nonlinearities according to the model. In order to reduce the demand of the analog / digital converter chip sampling rate for capturing the SWPA harmonics, the project intends to propose a harmonic convergence method to maximize capturing the high-order harmonics at low sampling rate conditions. In addition, the research group attempts to expand our pre-proposed Generalized Two-Box Cascaded model and Generalized Augmented Hammerstein model into multi-dimensional models for characterizing the harmonics together with their nearby inter-modulation distortions and memory effects. And then we will attempt to establish a digital pre-distorter for simulating and experimentally verifying the nonlinear correction of SWPAs. The project will address key technical issues for researching and developing the next generation SW communication system and optimizing the existing systems, as well as laying a solid foundation for the defense, emergency rescue, maritime strategy and so on. Meanwhile, the project will play an important part in the nonlinear modeling and correcting for the multi-band and multi-mode PAs.

英文关键词： short-wave power amplifier;nonlinearity correction;digital pre-distortion;harmonic distortion;memory effect