基于查找表的功放预失真技术研究  

Predistortion Technology for Power Amplifiers Based on Look-up Table

作　　者：陈斌[1] 任国春[2] 龚玉萍[2] 吕成林 

机构地区：[1]解放军理工大学通信工程学院研究生4队 [2]解放军理工大学通信工程学院无线通信系 [3]中国人民解放军65043部队

出　　处：《军事通信技术》2010年第4期52-55,96,共5页Journal of Military Communications Technology

摘　　要：在短波通信中,高速数据传输要求使用高效的线性调制技术,由于放大器固有的非线性特性,会产生频谱再生,造成邻道干扰,严重影响通信系统的性能。为补偿短波功率放大器的非线性失真,文中提出了一种基于查找表的基带数字预失真方法。该方法通过训练序列采用割线法获得复增益查找表,与普通自适应查找表预失真器相比,该预失真器可以离线处理失真数据,避免LUT的实时自适应更新,降低了对系统实时性的要求。仿真结果表明,该预失真器能够有效地改善功放的线性度,降低频谱再生。Linear modulation technologies are used in HF communications for high data rates.The inherent nonlinearity of high power amplifier causes spectrum regrowth and adjacent channel interference,which may affect communication system.In order to compensate for nonlinear distortion of HF power amplifiers,a digital baseband predistortion method based on Look-Up Table(LUT) was proposed.This method used a training sequence to obtain the complex gain LUT by secant iterative algorithm.Compared with the conventional adaptive predistorter based on LUT,it could process distortion data offline and avoid real-time adaptive updating of the LUT,and could lower the processing requirement of the system.Simulation results show that the predistorter can improve the linearity of the power amplifier and reduce spectrum regrowth greatly.

关 键 词：功率放大器 预失真 查找表 割线法 

分 类 号：TN7[电子电信—电路与系统]