Legendre wavelet for power amplifier linearization

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• 作者：Xiaoyang Zheng ; Liyun Su ; Shunren Hu…
• 关键词：Power amplifier ; Pre ; distortion ; Orthogonal polynomials ; Legendre wavelet
• 刊名：Analog Integrated Circuits and Signal Processing
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：84
• 期：2
• 页码：283-292
• 全文大小：1,559 KB
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• 作者单位：Xiaoyang Zheng (1)
  Liyun Su (1)
  Shunren Hu (2)
  Zhiyong Ye (1)
  Jiangping He (1)
  
  1. College of Mathematics and Statistics, Chongqing University of Technology, Chongqing, 400054, China
  2. College of Electronic Information and Automation, Chongqing University of Technology, Chongqing, 400054, China
  
• 刊物类别：Engineering
• 刊物主题：Circuits and Systems
  Electronic and Computer Engineering
  Signal,Image and Speech Processing
  
• 出版者：Springer Netherlands
• ISSN：1573-1979

文摘

Power amplifier (PA) plays a key role in transceivers for mobile communication systems and the improvement of the linearity of the PA becomes an objective of first importance. This paper proposes a novel linearization method for PA based on the Legendre wavelet possessing rich properties, so as to this technique combines the advantages of piecewise linear functions and orthogonal polynomials for pre-distortion linearization. Pre-distorter (PD) has been identified and power spectrum also has been compared based on the data of the PA characteristics for WCDMA and OFDM signals, respectively. The computational results demonstrate that a quite significant improvement in linearity is achieved and the PD is stable and effective. The most attractive aspects of the presented method is that the Legendre wavelet bases can approximate static nonlinearity of the PA with different level of resolution and lower order piecewise polynomials than that of other polynomials.