DPD系统中正交调制校正的设计与实现

摘要

Digital pre-distortion has the advantages of low power consumption,compact structure,strong self-adaptive abili-ty,high stability and efficiency,which is one of the most effective ways to improve the linearity of power amplifiers,but in prac-tical application,the desired effect of digital pre-distortion can not be realized due to the orthogonal modulation error in the link. Aiming at the problem,a design and implementation scheme of quadrature modulation correction based on microblaze em-bedded system was proposed in this paper. The simulation results show that the digital predistortion with quadrature modulation compensation could improve its function and reduce the demand of digital pre-distortion to link accuracy.%数字预失真技术具有低功耗、低成本、结构紧凑、稳定、高效、自适应等优点,是改善功率放大器线性度最有效的方法之一;但在实际应用中,由于链路上存在正交调制误差,使得数字预失真改善的效果不能达到预期的效果,甚至使结果恶化.针对这个问题,提出一种正交调制校正的设计与实现方案,并将其应用到数字预失真系统中.仿真结果表明,经正交调制校正后能改善数字预失真的性能,降低数字预失真对链路精度的要求.