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In this paper, an experimental approach is proposed to accurately identify, under a modulated signal drive, the memoryless nonlinearity of power amplifiers exhibiting memory effects. It is experimentally demonstrated that, when they are present, memory effects bias the extracted static nonlinearity. Accordingly, the sampling rate of the WCDMA test signal waveform is varied to reduce the signalpsilas bandwidth. It is shown that this approach minimizes the memory effects contribution to the amplifierpsilas nonlinear behavior and leads to accurate characterization of the dasiatruepsila static nonlinearity. The performance of the proposed approach is then assessed through experimental memoryless digital predistortion.
Date of Conference: 15-20 June 2008