计算机工程 ›› 2012, Vol. 38 ›› Issue (22): 59-61.doi: 10.3969/j.issn.1000-3428.2012.22.014

• 网络与通信 • 上一篇    下一篇

应用信号概率分布的查找表预失真方法

胡莉莉 1a,艾 渤 1b,2   

  1. (1. 北京交通大学 a. 电子信息工程学院;b. 轨道交通控制与安全国家重点实验室,北京 100044; 2. 武警工程学院通信工程系,西安 710078)
  • 收稿日期:2012-02-23 修回日期:2012-03-20 出版日期:2012-11-20 发布日期:2012-11-17
  • 作者简介:胡莉莉(1989-),女,硕士研究生,主研方向:无线通信,预失真技术;艾 渤,教授、博士生导师
  • 基金项目:
    国家自然科学基金青年基金资助项目(60901004);中央高校基本科研业务费专项基金资助项目(2010JBZ008);教育部博士点基金资助项目(20090009120037);陕西省自然科学基础研究计划基金资助项目(2009JQ8004)

Look-up Table Predistortion Method Using Signal Probability Distribution

HU Li-li 1a, AI Bo 1b,2   

  1. (1a. School of Electronic and Information Engineering; 1b. State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing 100044, China; 2. Department of Telecommunications Engineering, Engineering College of Armed Police Force, Xi’an 710078, China)
  • Received:2012-02-23 Revised:2012-03-20 Online:2012-11-20 Published:2012-11-17

摘要: 传统的基于查找表的数字自适应预失真技术没有考虑功率放大器输入信号的统计特性。为此,在正交频分复用(OFDM)系统中,结合OFDM信号幅度概率分布的特性,提出一种新的查找表构建方法。仿真结果表明,与传统的基于查找表的预失真技术相比,该方法能够有效地抑制由功率放大器非线性特性引起的信号带外频谱扩展。

关键词: 功率放大器, 正交频分复用, 线性化, 预失真, 查找表, 频谱扩展

Abstract: Traditional Look-up Table(LUT)-based predistortion technology does not take the statistical properties of power amplifier’s input into consideration. A new LUT-based digital predistortion technique combined with the statistical properties of amplitude of Orthogonal Frequency Division Multiplexing(OFDM) signal is proposed in OFDM systems. Simulation results show that compared with traditional LUT-based predistortion technology, the new scheme can effectively suppress the spread spectrum that is caused by the nonlinearity of power amplifier.

Key words: power amplifier, Orthogonal Frequency Division Multiplexing(OFDM), linearization, predistortion, Look-up Table(LUT), spread spectrum

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