认知无线电系统数字射频功率放大技术研究

Cognitive radio is the route that people have to take to solve the spectrum scarcity. Digital RF front end is the best choice for cognitive radio systems. Digital RF power amplifier is the biggest obstacle for realization of the digital RF front end. This project is aiming at the fundamental shortage of the frond-end of the current cognitive radio system. The research will focused on the operation principle and implementation methods of the tunable digital RF power amplifiers with ultra-wide frequency band. Mastering the design theory and key technologies of the power amplification with high-efficiency and linearity for digital RF signal. Solving the key science problem of enabling a power amplifier to have four characteristics of high-efficiency, ultra-linearity, frequency agility and ultra-wide frequency-band simultaneously. Exploring the generation mechanism of the nonlinearity of a digital RF power amplifier. Studying on the linearization techniques with frequency agility for digital RF power amplifiers to improve their linearity. Based on the deep research on the digital RF power amplifier theory, the core technology should be mastered and independent innovation will be done. Realizing the principle prototype of a tunable digital RF power amplifier so as to lay a solid foundation for construction of all digital cognitive radio system. Digital RF power amplification technology involved in this project not only can be used for the cognitive radio systems, but also can be directly utilized in digital array radars, especially suitable for the integrated multifunction system of radar and communication. Therefore, this project has extremely vital significance for development of communication and radar technologies for both military and civil application.

认知无线电是解决频谱匮乏的必由之路，数字射频前端是认知无线电系统的最佳选择，数字射频功放是实现数字射频前端的最大障碍。本项目针对现有认知无线电射频前端的基础性不足，研究具有超宽工作频带的可调数字射频功放的工作原理和技术实现方法，掌握数字射频信号高效线性放大设计理论和关键技术，解决如何使射频功放同时兼备高效率、超线性、捷变频和宽频带四大特性的关键科学问题。探索数字射频功放非线性产生机理，研究具有捷变频能力的数字射频功放线性化技术，提高数字射频功放线性度。在对数字射频功放理论深入研究基础上，掌握其核心技术并进行自主创新，实现可调谐数字射频功放原理样机，为构建全数字认知无线电系统奠定坚实基础。基于本项目的数字射频功放技术不仅可以用于认知无线电系统，也可以直接用于数字阵列雷达，尤其是通信雷达一体化多功能系统，因此，本项目对于军民两用通信和雷达技术的发展及其系统基础性能的提升，均具有十分重要的意义。

认知无线电是解决频谱匮乏的必由之路，数字射频前端是认知无线电系统的最佳选择，数字射频功放是实现全数字射频前端的最大障碍。本项目针对现有认知无线电射频前端的基础性不足，研究数字射频功放的工作原理和技术实现方法，掌握数字射频信号高效线性放大设计理论和关键技术，化解射频功放高效率和超线性的矛盾。探索数字射频功放非线性产生机理，研究数字射频功放的线性化理论与技术，提高其线性度。在对数字射频功放理论深入研究基础上，掌握其核心技术并进行自主创新，实现了数字射频功放原型样机，构建了认知无线电数字射频功放实验验证系统，为建成全数字认知无线电系统奠定了良好基础。项目执行期间，在国内外学术期刊和国际学术研讨会上共发表学术论文37篇，其中SCI收录10篇，EI收录4篇，国际学术刊物10篇，国内核心刊物14篇，国内一般刊物8篇，国际学术会议论文4篇，国内学术会议1篇。成功获得国家发明专利授权4项，申请国家发明专利5项。培养博士毕业研究生2名、硕士研究生23名，圆满完成了预期的项目目标任务。