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Volume 38 Issue 9
Sep.  2012
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Journal of Beijing University of Aeronautics and Astronautics  > 2012  >  (9): 1172-1175.
Li You, Zhang Xiaolin, Xiao Xinet al. Reduction of PAPR using companding with pre-distortion[J]. Journal of Beijing University of Aeronautics and Astronautics, 2012, (9): 1172-1175. (in Chinese)
Citation: Li You, Zhang Xiaolin, Xiao Xinet al. Reduction of PAPR using companding with pre-distortion[J]. Journal of Beijing University of Aeronautics and Astronautics, 2012, (9): 1172-1175. (in Chinese)
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Reduction of PAPR using companding with pre-distortion

  • School of Electronics and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

  • Received Date: 21 Sep 2011
  • Publish Date: 30 Sep 2012
    Abstract
  • To solve the conflict between peak to average power ratio (PAPR) and bit error ratio (BER) in companding, a joint companding pre-distortion (PD) method was proposed. The closed form expression of subcarrier signal to noise ratio (SNR) of orthogonal frequency division multiplexing (OFDM) signal, which was distorted by nonlinear power amplifier, was deduced under additive white Gaussion noise (AWGN) channel using Bussgang theorem. The nonlinear power amplifier was replaced by ideal PD. Then the linear companding was modified. The new expression of subcarrier SNR was obtained using three parameters of ideal PD and modified linear companging. The system BER was calculated by the new SNR. The simulation results show that, by adjusting the three parameters, the SNR threshold can be improved by 0.8 dB under the same PAPR reduction and BER.

     

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