通信学报 ›› 2015, Vol. 36 ›› Issue (1): 75-83.doi: 10.11959/j.issn.1000-436x.2015009

• 学术论文 • 上一篇    下一篇

基于坐标变换的射频功放预失真参数估计方法

黄浩1,2,钱骅1,2,3,姚赛杰1,2,杨秀梅1,2   

  1. 1 中国科学院 上海微系统与信息技术研究所,上海 200050
    2 上海无线通信研究中心,上海 200335
    3 中国科学院 无线传感网与通信重点实验室,上海 200335
  • 出版日期:2015-01-25 发布日期:2017-06-21
  • 基金资助:
    中国科学院“百人计划”基金资助项目,国家科技重大专项基金资助项目;科技部国际科技合作基金资助项目;上海市科技创新行动计划基金资助项目

Coordinate transformation based coefficients estimation algorithm for digital predistortion of RF power amplifiers

GHao HUAN1,2,Hua QIAN1,2,3,Sai-jie YAO1,2,Xiu-mei YANG1,2   

  1. 1 Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China
    2 Shanghai Research Center for Wireless Communications,Shanghai 200335,China
    3 Key Laboratory of Wireless Sensor Network & Communication,Chinese Academy of Sciences,Shanghai 200335,China
  • Online:2015-01-25 Published:2017-06-21
  • Supported by:
    The 100 Talents Program of Chinese Academy of Sciences; The National Key Science and Technology Project;The International Science and Technology Cooperation Project of China;Innovation Foundation of Shanghai Science and Technology

摘要:

在低中频预失真器构架的基础上,提出了一种基于坐标变换的预失真参数估计方法,从而降低了传统数字基带预失真系统的硬件成本和数值计算量。算法将传统算法中的复数乘法转换为极坐标中的幅度乘法和相位加法,使同样的计算步骤所消耗的乘法和加法次数分别降低了75%和50%。所提算法由通用的通带Volterra非线性模型进行推导得出,证明了预失真处理算法中基带信号和低中频信号的等同适用性。对实际射频功放的测试实验结果验证了其有效性。

关键词: 射频功率放大器, 自适应预失真, 非线性, 低中频, 参数估计

Abstract:

Based on the low-IF digital predistortion (DPD) architecture,a coordinate transformation based low-complex coefficients estimation algorithm is proposed to reduce the hardware implementation cost and numerical calculation complexity significantly.The proposed algorithm transforms the complex multiplication of the conventional DPD coefficients estimation method to amplitude multiplication and phase addition in polar coordinates.To complete the same calculation,times of multiplications and accumulations are reduced by 75% and 50%.The algorithm is derived from the general Volterra pass-band nonlinear model,and proves the equivalency of baseband predistortion and IF predistortion.The proposed low-IF architecture and the coefficients estimation algorithm are verified by the measurement results on a practical radio frequency power amplifier.

Key words: radio frequency power amplifier, adaptive predistortion, nonlinearity, low-intermediate frequency, coefficients estimation