LINEARIZATION OF HETEROGENEOUS POWER AMPLIFIER SYSTEMS

摘要

Systems and methods are provided for adaptive linearization of an amplifier system having a plurality of heterogeneous amplifier paths. An amplifier system includes a plurality of amplifier paths, each configured to provide an amplified output signal from an input signal, and a signal combiner configured to combine the amplified output signals from the plurality of amplifier paths to provide a system output, such that the system output is a non-linear function of the amplified output signals. A monitoring system is configured to sample the system output and normalize the sampled output to a signal level associated with the input signal. A signal processing component is configured to characterize the amplifier paths via an iterative adaptive linearization process, such that the system output is linear with respect to the input signal.

主权项

1. A method for linearizing an amplifier system having a plurality of heterogeneous amplifier paths, the method comprising:
selecting a first amplifier path of the plurality of heterogeneous amplifier paths; providing an input signal to the amplifier system; sampling an output of the amplifier system and an output of a predistorter on the first amplifier path to produce a set of matched pairs of predistorted input values, each predistorted via a current predistortion function of the first amplifier path, and corresponding system outputs; subtracting, for each of the matched pairs, an expected contribution of each amplifier path of the plurality of heterogeneous amplifier paths that is not the first amplifier path from the corresponding system output to produce a set of modified data points comprising the predistorted input values and corresponding modified system outputs; and determining a new predistortion function for the first amplifier path from the set of modified data points.