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2015 Volume 40 Issue 8
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LI Lin,YAN Peng. On Adaptive Digital Pre-distortion Device Based On Polar Coordinates[J]. Journal of Southwest China Normal University(Natural Science Edition), 2015, 40(8).
Citation: LI Lin,YAN Peng. On Adaptive Digital Pre-distortion Device Based On Polar Coordinates[J]. Journal of Southwest China Normal University(Natural Science Edition), 2015, 40(8).
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On Adaptive Digital Pre-distortion Device Based On Polar Coordinates

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  • Taylor series is used to fit the AM/AM and AM/PM characteristic curves of the pre‐distortion device .Two look‐up tables (amplitude table and phase table) are created by means of the amplitude of the input signal in polar coordinates .T he nonlinearity of the pow er amplifier is compensated by updating the coefficients of the table through least mean square adaptive algorithm .According to the method mentioned above ,An adaptive digital pre‐distortion system based on 16‐QAM modulation and demodulation is built through the Matlab software .The simulation results show that adjacent channel power ratio (ACPR) is reduced about 20dB .The linearity of power amplifier is significantly improved .
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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On Adaptive Digital Pre-distortion Device Based On Polar Coordinates

Abstract: Taylor series is used to fit the AM/AM and AM/PM characteristic curves of the pre‐distortion device .Two look‐up tables (amplitude table and phase table) are created by means of the amplitude of the input signal in polar coordinates .T he nonlinearity of the pow er amplifier is compensated by updating the coefficients of the table through least mean square adaptive algorithm .According to the method mentioned above ,An adaptive digital pre‐distortion system based on 16‐QAM modulation and demodulation is built through the Matlab software .The simulation results show that adjacent channel power ratio (ACPR) is reduced about 20dB .The linearity of power amplifier is significantly improved .

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