面对日益增长的通信信号带宽，数字双输入Doherty发射机作为一种新兴发射机结构，虽然潜力巨大但仍面临诸多挑战。为了解决数字双输入Doherty发射机在大带宽调制信号激励下效率和线性度较差的问题，本项目基于电路特征建模和迭代学习控制等电路分析方法和控制理论，提出了准线性数字双输入Doherty发射机设计方法。本项目遵循先理论条件后实际场景，先离线设计后在线优化，先单音信号激励后调制信号激励的方式开展研究，具体内容包括：系统效率最优前提下具有恒定理论增益的双输入发射机设计方法；双输入发射机性能随激励信号带宽增加而退化的原因及解决方案；基于迭代学习控制的双输入发射机线性化技术。本项目以双输入Doherty发射机效率最优为约束条件，研究信号分离函数在不同激励信号下的建立和优化方法，达到了综合提升效率及线性度的目标，为具有大包络带宽需求的无线发射机提供了高性能的实现方案。

As an emerging transmitter structure, digitally-assisted dual-input Doherty transmitter has shown great potentiality, but still have many problems when dealing with the wideband modulated signal. In order to improve the efficiency and linearity of digitally-assisted dual-input Doherty transmitter under the excitation of wideband modulated signal, this project proposes a quasi-linear digitally-assisted dual-input Doherty transmitter design method based on circuit analysis method and control theory such as behavioural modeling and iterative learning control. This project is carried out in the following ways: first theoretical conditions and then actual scenes; first off-line design and then online optimization; first single tone signal excitation and then modulation signal excitation. The specific research contents of this project include: a design method with theoretical constant gain under the premise of optimal system efficiency; causes and solutions of the performance degradation of dual-input transmitter with increasing excitation signal bandwidth; a dual-input transmitter linearization technique based on iterative learning control. Establishment and optimization methods of the signal separation functions under different excitation signals are studied in this project with the premise that the dual input Doherty transmitter has the best efficiency. The above method achieves the goal of improving efficiency and linearity comprehensively, and provides a high-performance solution for wireless transmitter with large envelope bandwidth requirements.