Blind linearization using cross-modulation
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United States of America Patent
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Jan 6, 2004
Grant Date -
Jan 1, 2004
app pub date -
Jun 28, 2002
filing date -
Jun 28, 2002
priority date (Note) -
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Abstract
An amplitude modulated source signal (102) is received, where this signal has a source frequency bandwidth and a source envelope. A dummy envelope is computed that would yield a constant if the dummy envelope and source envelope were to be combined. An amplitude modulated dummy signal (105) is generated, where this dummy signal exhibits the computed, dummy signal envelope and has a prescribed frequency bandwidth different than the source frequency bandwidth. The source and dummy signals are added to form a combined signal (113), which is directed to an input (114a) of a nonlinear circuit (114), that is, one that exhibits amplitude dependent nonlinearity. Signals of the dummy frequency bandwidth and any intermodulation products are filtered from the output, thereby providing a linearized output (118) corresponding to the original, source signal.
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