基于数字预失真技术的功放线性化方法研究  

Study on linearization method for power amplifier based on digital predistortion technology

作　　者：李世伟 韩军[1] 杨作成[1] Li Shiwei;Han Jun;Yang Zuocheng(The 54th Research Institute of China Electronics Technology Group Corporation,Shijiazhuang 050081,China)

机构地区：[1]中国电子科技集团第54研究所,河北石家庄050081

出　　处：《电子测量技术》2020年第1期132-136,共5页Electronic Measurement Technology

摘　　要：针对现代通信技术对功率放大器高线性化的需求,提出了基于数字预失真技术的优化方案,使用记忆多项式功放行为建模逼近真实的非线性特性,并在间接学习结构上采用递归预测误差训练算法迭代预失真权向量,实现对基带信号的校正处理。仿真结果表明该方案对功放非线性起到优化作用,减弱了频谱的泄露。同时,在实测过程中适当引入功率回退,该方案能获得更快的收敛速度和较好的稳定性,对需求高线性度的功放设计有一定的参考价值。Considering the demand of high linearization of power amplifiers in modern communication technology, an optimization scheme based on digital predistortion technology is proposed. This scheme uses memory polynomial power behavior modeling to approximate real nonlinear characteristics. The recursive prediction error training algorithm iterates the predistortion weight vector on the indirect learning structure to implement the correction processing of the baseband signal. The simulation results show that the scheme optimizes the nonlinearity of the power amplifier and reduces the spectrum leakage. At the same time, the power back-off is appropriately used in the actual measurement process. This scheme can obtain faster convergence speed and better stability, and has certain reference value for power amplifier design with high linearity.

关 键 词：功率放大器 非线性 数字预失真 仿真 功率回退 

分 类 号：TN925[电子电信—通信与信息系统]