Predistorter for a multi-antenna transmitter
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United States of America Patent
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Apr 23, 2013
Grant Date -
Dec 13, 2012
app pub date -
Jun 8, 2011
filing date -
Jun 8, 2011
priority date (Note) -
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Abstract
Methods and apparatus are disclosed for predistorting input data signals to a MIMO transmitter to compensate for distortions introduced by the MIMO transmitter. Distortions introduced to data signals by a MIMO transmitter include crosstalk between multiple transmit paths and non-linearities introduced by power amplifiers. In an exemplary predistorter, post-amplifier crosstalk is compensated for by a first matrix operation before distortions introduced by power amplifiers are predistorted by power amplifier predistorters. After the power amplifier predistorters, pre-amplifier crosstalk is compensated for by a second matrix operation.
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