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

• research and development • Previous Articles     Next Articles

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

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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