DSP oriented implementation of a feedforward power amplifier linearizer

In this contribution we introduce a new digital signal processing (DSP)-oriented implementation of a feedforward linearizer. The intermodulation distortion (IMD) signal is regenerated entirely in the digital baseband which gives better control over the linearization process and also improves the eff...

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Bibliographic Details
Main Authors: Burglechner, Sascha, Shahed Hagh Ghadam, Ali, Springer, Andreas, Valkama, Mikko, Hueber, Gernot
Format: Conference Proceeding
Language:English
Subjects:
Baseband
Digital signal processing
Intermodulation distortion
Power amplifiers
Power engineering and energy
Power harmonic filters
Radio frequency
Radiofrequency amplifiers
Virtual manufacturing
Wideband
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Summary:In this contribution we introduce a new digital signal processing (DSP)-oriented implementation of a feedforward linearizer. The intermodulation distortion (IMD) signal is regenerated entirely in the digital baseband which gives better control over the linearization process and also improves the efficiency of the overall amplifier. A new scheme to estimate the parameters of the proposed feedforward linearizer is presented which decouples the parameters of the signal and error cancellation loop. We have verified the new DSP oriented feedforward linearizer by means of simulations in the presence of component impairments like, e.g., IQ mismatch. Initial measurements results in a laboratory setup show a reduction of the adjacent channel power of approximately 15 to 20 dB.
ISSN:0271-4302
2158-1525
DOI:10.1109/ISCAS.2009.5118115