功放数字预失真线性化技术发展趋势与挑战

Digital predistortion:development trends and key techniques

射频功率放大器是发射机的核心器件之一,它在提供高效率的同时也成为了发射机非线性失真的主要来源.因此,发射机往往采用额外的功放线性化技术以兼顾效率和线性度,其中,数字预失真技术以其高精度、稳定、可灵活配置等优势成为目前应用最广泛、应用效果最好的一类线性化技术.本文从数字预失真的基本原理和关键技术出发,回顾了数字预失真技术近三十年的发展历程,探讨了目前数字预失真发展面临的关键技术挑战,为今后的研究提供了参考.

The power amplifiers(PAs)are a key device in the wireless communication system,providing high efficiency while being the major source of nonlinear distortion.To alleviate the confict between nonlinearity and efficiency,additional PA linearization techniques are used in transmitters.Among them,digital predistortion(DPD)has become the most popular linearization technique due to its outstanding advantages,including high precision,stability,and fexible configuration.This paper introduces the principle and key technologies of the DPD technique and summarizes the development trends and technical features of DPD in different development stages.In future communication systems,the DPD technique will be evolved to simultaneously improve compensation accuracy and reduce power consumption.