计算机工程

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宽带功率放大器PGSC建模方法及预失真研究

南敬昌,曲 昀,高明明   

  1. (辽宁工程技术大学电子与信息工程学院,辽宁 葫芦岛 125105)
  • 收稿日期:2012-12-10 出版日期:2014-02-15 发布日期:2014-02-13
  • 作者简介:南敬昌(1971-),男,教授、博士,主研方向:射频电路与器件,通信系统仿真,线性化技术;曲 昀,硕士研究生;高明明,讲师、博士研究生
  • 基金项目:
    国家自然科学基金资助项目“宽带射频功率放大器非线性及行为模型的研究”(60971048);国家科技重大专项基金资助项目“新一代宽带无线移动通信网”(2010ZX03007-002-03);辽宁省博士启动基金资助项目(20091033)

PGSC Modeling Method for Broadband Power Amplifier and Pre-distortion Research

NAN Jing-chang, QU Yun, GAO Ming-ming   

  1. (School of Electronic and Information Engineering, Liaoning Technical University, Huludao 125105, China)
  • Received:2012-12-10 Online:2014-02-15 Published:2014-02-13

摘要: 针对宽带功率放大器的强记忆效应特性,提出一种功放建模和数字预失真方法——PGSC模型。利用广义记忆多项式(GMP)、特定交叉项(SCT)及记忆时刻信号交叉项(CIMT)3个基函数来构造功放行为模型及数字预失真器,并搭建实际测试平台对模型的精度及线性化效果进行验证。测试结果表明,与PMEC方法相比,PGSC方法建模时的归一化均方误差减少了2.1 dB,数字预失真时输出信号的三阶邻信道功率比降低了4.94/2.03 dB;与GMP方法相比,PGSC方法仅利用73%的系数即可得到更高的模型精度和更好的线性化效果。

关键词: 无线通信, 宽带功率放大器, 行为模型, 数字预失真, 记忆效应, Volterra级数

Abstract: A new modeling and Digital Pre-distortion(DPD) method named as Parallel GMP-SCT-CIMT(PGSC) is proposed because of the strong memory effect characteristics of broadband power amplifier. The new behavioral model of power amplifier and pre-distorter are constructed of Generalized Memory Polynomial(GMP), Specific Cross Terms(SCT) and Cross Items between Memory Times(CIMT). A test platform is built to verify the accuracy and linear effect of the method. Experimental results show that compared with the PMEC method, the PGSC method shows an average Normalized Mean Square Error(NMSE) improvement of 2.1 dB in behavioral modeling, and reduces the third-order ACPR of output signal by 4.94/2.03 dB in DPD application. Compared with the GMP method, the PGSC method achieves higher model accuracy and better linear effect just using approximately 73% of coefficients.

Key words: wireless communication, broadband power amplifier, behavioral model, Digital Pre-distortion(DPD), memory effect, Volterra series

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