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US 6,400,233 B1Granted
Method and apparatus for compensating for distortion in IQ modulators
AssigneeIFR, Inc.
InventorNeil E. Thomas
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AssigneeIFR, Inc.
InventorNeil E. Thomas
Estimating the term…
A distortion compensating apparatus for use in IQ modulation and demodulation techniques wherein a first distortion arrangement distorts the I-signal by adding to the I-signal a first weighted function of the I-signal and a first weighted function of the Q-signal and a second distortion arrangement distorts for Q-signal by adding to the Q-signal a second weighted function of the I-signal and a second weighted function of the Q-signal, such that the weighted functions of the I-signal are independent of the Q-signal and the weighted functions of the Q-signal are independent of the I-signal. This enable distortions to be compensated in both sidebands of the IQ modulated signal.
A distortion compensating apparatus for use in IQ modulation and demodulation techniques wherein a first distortion arrangement distorts an I-signal by adding to the I-signal a first weighted non-linear function of the I-signal and a first weighted non-linear function of a Q-signal and a second distortion arrangement distorts the Q-signal by adding to the Q-signal a second weighted non-linear function of the I-signal and a second weighted non-linear function of the Q-signal, such that the weighted non-linear functions of the I-signal are independent of the Q-signal and the weighted non-linear functions of the Q-signal are independent of the I-signal.
A method for improving linearity in IQ modulation and demodulation techniques comprising steps wherein an I-signal is distorted by adding to the I-signal a first weighted non-linear function of the I-signal and a first weighted non-linear function of a Q-signal and the Q-signal is distorted by adding to the Q-signal a second weighted non-linear function of the I-signal and a second weighted non-linear function of the Q-signal, such that the weighted functions of the I-signal are independent of the Q-signal and the weighted functions of the Q-signal are independent of the I-signal.
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