Power series predistorter and control method thereof
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United States of America Patent
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Mar 15, 2011
Grant Date -
Nov 23, 2006
app pub date -
May 16, 2006
filing date -
May 18, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a distortion generation path of a power series predistorter, a frequency characteristic compensator that adjusts the frequency characteristic of a distortion component is provided in series with an odd-order distortion generator. The output of a power amplifier is divided to obtain an output signal of the power amplifier, the output signal of the power amplifier is down-converted by a down converter, and a distortion detector detects a distortion component in the down-converted signal of base band. The frequency characteristic of the distortion component is split into windows each having a band width of Δf by a distortion component frequency characteristic splitter, and the power of the distortion component in each window is detected. Based on the detected power, the frequency characteristic compensator adjusts a part of the frequency characteristic of the distortion component associated with each window.
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