基于实基带的数字预失真结构设计与实现

Power amplifier (PA) is a key device in the RF transmission link of wireless communication system. With the development of mobile communication technology, the power amplifier excited by large bandwidth signal shows more complex nonlinear distortion characteristics. The signal passing through the power amplifier must be corrected by linearization technology to compensate the distortion of the transmitted signal and improve the communication quality. Digital predistortion (DPD) has become the mainstream and research hotspot of power amplifier linearization technology because of its flexible, efficient, stable and reliable characteristics. With the large-scale commercial use of the fifth generation mobile communication, the evolution trend of mobile communication with the miniaturization of base stations is gradually clear. In order to meet the requirements of the new generation communication system for low power consumption and low cost of each module, this paper focuses on solving the problem of high complexity of each link of digital predistortion, and proposes a digital predistortion structure based only on real baseband signal, which effectively reduces the computational complexity and implementation cost of digital predistortion. The experimental results show that the performance is close to the current mainstream algorithm and structure.