Feedback Quantization in Crosscorrelation Predistorters

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    Abstract

    Amplification of signals with fluctuating envelopes inevitably leads to distortion because of non-linear behavior of the Power Amplifier (PA). Digital Predistortion can counteract these non-linear effects. In this paper, the crosscorrelation predistorter is described and the effects of quantization in the feedback path are presented. One of the effects is that the quantization noise becomes correlated with the signal to be quantized, resulting in reduced performance of predistortion. A technique to reduce these effects is to inject a dither signal before quantization. Because of the quantization noise and dither signal, more data has to be used to obtain estimates of the PA behavior that are accurate enough for effective predistortion.
    Original languageEnglish
    Pages (from-to)552-554
    Number of pages3
    JournalIEEE microwave and wireless components letters
    Volume15
    Issue number9
    DOIs
    Publication statusPublished - Sept 2005

    Keywords

    • CAES-EEA: Efficient Embedded Architectures
    • Crosscorrelation
    • Analog to digital converter (ADC)
    • Power amplifiers (PAs)
    • Memory polynomial
    • Digital predistortion
    • Dither

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