Modulated signal transmission system compensated for nonlinear and linear distortion
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United States of America Patent
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Aug 16, 1994
Grant Date -
N/A
app pub date -
Jul 1, 1993
filing date -
Jul 1, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a modulated signal transmission system operable in response to an input digital signal of a baseband to produce a modulated signal through a nonlinear amplifier, a nonlinear converter is controlled by a control signal generator to compensate for not only a nonlinear distortion but also a linear distortion. The control signal generator is given a difference signal between a linearly detected signal and the input digital signal to which an estimated linear distortion is added by a linear filter having filter coefficients controlled by a filter coefficient estimator. An additional nonlinear converter is located prior to the linear filter. Alternatively, the linear filter may be located after the nonlinear converter.
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