A Blind AM/PM Estimation Method for Power Amplifier Linearization

A Blind AM/PM Estimation Method for Power Amplifier Linearization

A higher order statistics (HOS)-based method is proposed in this letter to estimate the nonlinear amplitude-to-phase (AM/PM) conversion function of power amplifiers (PAs) in communications systems. By utilizing the symmetry property of the modulated signal, the proposed method estimates the AM/PM co...

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Veröffentlicht in:IEEE signal processing letters 2013-11, Vol.20 (11), p.1042-1045
Hauptverfasser: Zhiwen Zhu, Xinping Huang, Caron, Mario, Leung, Henry
Format: Artikel
Sprache:eng
Schlagworte:
AM/PM conversion
Constellation diagram
Estimation
higher order statistics
nonlinear
Nonlinear distortion
Power amplifier
predistorter
Pulse shaping methods
Timing
Vectors
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Xinping Huang
Caron, Mario
Leung, Henry
description A higher order statistics (HOS)-based method is proposed in this letter to estimate the nonlinear amplitude-to-phase (AM/PM) conversion function of power amplifiers (PAs) in communications systems. By utilizing the symmetry property of the modulated signal, the proposed method estimates the AM/PM conversion function using only the PA output signal, from which the phase predistorter (PD) function can be derived. Simulation results show that the HOS-based method can accurately determine the phase PD function required to compensate for the AM/PM distortion in the PA, yielding a linearization performance close to that of non-blind methods in terms of adjacent channel power ratio and error vector magnitude.
doi_str_mv 10.1109/LSP.2013.2280394
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subjects AM/PM conversion
Constellation diagram
Estimation
higher order statistics
nonlinear
Nonlinear distortion
Power amplifier
predistorter
Pulse shaping methods
Timing
Vectors
title A Blind AM/PM Estimation Method for Power Amplifier Linearization
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