Relaxed digitization system linearization

摘要

An approach to linearization relaxes the requirements on the digitization of the analog output signal while maintaining the benefits of a high sampling rate of the output signal. The digitization approach extracts sufficient information to characterize the output signal over a wide bandwidth without necessarily determining sufficient information to fully represent the output signal, for example, without sampling the output signal at the Nyquist sampling rate with a sufficient precision to accurately represent the signal.

主权项

1. A digital predistortion linearizer, comprising:
a pre-distorter to determine a driving signal representative of an input to a plant to achieve a desired output from the plant, wherein the driving signal has a driving signal data rate equal to a product of a driving signal sampling rate and a driving signal precision, and the desired output has a desired output bandwidth; a digitizer coupled to the second input to process an analog sensor signal to generate a sampled sensor signal, wherein the analog sensor signal is representative of an achieved output from the plant, the digitizer is responsive to components of the analog sensor signal outside the desired output bandwidth in a sensor bandwidth greater than the desired output bandwidth, the sampled sensor signal has a sensor signal precision lower than the driving signal precision, and the sampled sensor signal has a sensor signal data rate smaller than the driving signal data rate; and an estimator to receive the sampled sensor signal from the digitizer and the driving signal determined by the pre-distorter, and to provide configuration data for configuring the pre-distorter.