Nonlinear pre-distortion modulator and long loop control
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United States of America Patent
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Aug 31, 2004
Issued Date -
N/A
app pub date -
Nov 6, 2000
filing date -
Nov 6, 2000
priority date (Note) -
Expired
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Abstract
Method for predistortion compensation for nonlinear distortion produced by the non-linear power amplifier of the QAM signal at the transmitter side of the direct digital communication channel. The out-of-band signal power is monitored by the existent receiver at the receive side of the direct propagation channel. The nonlinear distortion compensation signal is generated at the receiver/demodulator side of the direct propagation channel and transmitted across the direct propagation channel to an input of a pre-distortion block at the transmitter/modulator side of the direct propagation channel. The nonlinear distortion compensation signal is used to adjust the set of parameters of the pre-distortion block in order to minimize the out-of-band power produced by the non-linear amplifier (NLA).
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