| 摘要 |
A system and method for modulating and amplifying an input signal are provided in a communication transmitter. The transmitter includes a pre-distortion lookup table containing pre-distortion lookup data. An auto-calibration module is in communication with the pre-distortion lookup table. The auto-calibration module is configured to operate during a closed-loop auto-calibration interval and to calibrate the pre-distortion lookup data to compensate for a non-linearity in the transmitter. A baseband processor is in communication with the pre-distortion lookup table. The baseband processor is configured to receive an input signal and to generate a pre-distorted baseband I/Q signal pair. The pre-distortion is based on the pre-distortion lookup data during an open-loop operational interval. An I/Q modulator is in communication with the baseband processor. The I/Q modulator is configured to modulate an RF carrier signal based on the pre-distorted baseband I/Q signal pair and to generate a pre-distorted, modulated RF carrier signal. A power amplifier is in communication with the baseband processor and the I/Q modulator. The power amplifier is configured to amplify the corrected, modulated RF carrier signal and to generate an amplified RF signal. A digital feedback path in communication with the power amplifier and the baseband processor. The digital feedback path is configured to provide a feedback signal to the baseband processor during the closed-loop auto-calibration interval.
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