电信科学 ›› 2009, Vol. 25 ›› Issue (12): 51-56.doi: 10.3969/j.issn.1000-0801.2009.12.013

• 研究与开发 • 上一篇    下一篇

宽带OFDM功放自适应数字预失真算法的研究与实现

王建新1,2,余建国1,2   

  1. 1 北京北方烽火科技有限公司 北京100085
    2 武汉邮电科学研究院光纤通信技术和网络国家重点实验室（筹）武汉 430074
  • 出版日期:2009-12-15 发布日期:2009-12-15
  • 基金资助:
    国家“863”高科技计划基金资助项目;国家“863”高科技计划基金资助项目

Research and Realization of Adaptive Digital Pre-distortion Algorithm for Wideband OFDM Power Amplifiers

Jianxin Wang1,2,Jianguo Yu1,2   

  1. 1 Beijing Northern FiberHome Technologies Co.，Ltd.，Beijing 100085，China
    2 State Key Laboratory of Optical Communication Technologies and Networks，Wuhan Research Institute of Post and Telecommunications，Wuhan 430074，China
  • Online:2009-12-15 Published:2009-12-15

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11

摘要：

针对宽带OFDM功放的线性化问题，本文提出了一种基于训练序列的递推最小二乘算法和最小均方算法的组合算法，并将其应用到基于多项式的数字预失真系统中以实现自适应数字预失真滤波器系数的估计和更新。本文首先介绍了整个数字预失真系统的组成架构；然后是自适应数字预失真算法的实现，使用MATLAB 软件对其算法进行仿真验证；最后还组建了实验系统，进行了ACLR测试实验。仿真结果和测试结果均表明基于自适应数字预失真算法的宽带线性化功放具有良好的性能，OFDM功放输出的线性度改善6 dB。

关键词: 正交频分复用, 功放, 数字预失真, 自适应算法, 递推最小二乘算法

Abstract:

Focused on the problem that the wideband OFDM power amplifiers has linearization，a hybrid algorithm of LMS and RLS based on training sequence is proposed，which is applied to a digital pre-distortion system based on polynomial. It can estimation and update adaptive digital pre-distortion filter coefficients. First，this paper was given the configuration of all digital pre-distortion system.Second，adaptive digital pre-distortion algorithm was realized.The algorithm was simulated by using MATLAB software. At last，experimental system was set up and tested ACLR experimentation. Simulation result and test result show that wideband linearization power amplifier have better performance based on adaptive digital pre-distortion algorithm. OFDM power amplifier of linearity is improved 6 dB。

Key words: orthogonal frequency division multiplexing（OFDM）, power amplifier（PA）, digital pre-distortion（DPD）, adaptive algorithm, recursive least square algorithm

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