介绍了国外应用在数字电视发射机中的自适应预失真技术，着重介绍了笛卡尔环的工作原理、高功放产生互调失真的原理以及预失真的工作原理．-The principles of foreign applications in the digital TV transmitter adaptive pre-distortion technology, focuses on the working principle of Descartes ring, high power amplifier intermodulation distortion, as well as the working principle of pre-distortion.