【摘要】 通信技术的发展对于功率放大器的要求越来越高,主要集中在高线性、高效率的功放。预失真是目前改善功放线性比较好的方法。新的自适应混合预失真系统充分利用模拟预失真,快速简单的和数字预失真算法的精确,输入信号先后经过模拟、数字两级预失真系统,并结合信号包络检测技术进行带外信号调节。通过对仿真结果的比较,IMD性能比单独使用数字预失真系统有了8 dB的改善,同时收敛时间也有所减少。更多还原

【Abstract】 The development of microwave communication has brought forward the demand of high quality linear high power amplifier.Predistortion is one of the best techniques to improve the linearity of the power amplifier.An adaptive hybrid predistortion linearization method using an envelope measurement to adjust the out of band signal is proposed and simulated in this paper.In the new method,combining the analog and digital structure in series,which can make the best of speed and simplicity for analog and algorithmic precision for DSP.By comparing with the results of digital predistortion,this new method can enhance the performance of IMD of 8 dB and reduce the iteration time.更多还原