Blind linearization using cross-modulation

An apparatus comprising circuitry of multiple interconnected electrically conductive elements configured to perform operations to linearize output of a processing module with amplitude dependent nonlinearity, the operations comprising:

• receiving an amplitude modulated source signal of a source frequency bandwidth and exhibiting a source envelope;
• computing a dummy envelope that would yield a predetermined constant if the source and dummy envelopes were to be combined;
• creating an amplitude modulated dummy signal exhibiting the dummy envelope and occurring on a dummy frequency bandwidth, where the dummy frequency bandwidth differs from the source frequency bandwidth;
• adding the source signal, and the dummy signal to form a combined signal;
• directing the combined signal to an input of a processing module whose output exhibits amplitude dependent nonlinearity;
• filtering signals including signals of the dummy frequency bandwidth from the output to provide a linearized output.

A linearization apparatus for processing a signal input comprising an amplitude modulated source signal having a source frequency bandwidth and exhibiting a source envelope, the apparatus comprising:

• an envelope computer utilizing the source signal to compute a dummy envelope that would yield a predetermined constant if the source and dummy envelopes were to be combined;
• a dummy signal generator providing an amplitude modulated dummy signal exhibiting the computed dummy envelope, where the dummy signal occurs at one or more predetermined dummy frequencies and the predetermined frequencies differ from the source frequency bandwidth;
• an adder coupled to the signal input and the dummy signal generator to add the source signal and the dummy signal to form a combined signal available for processing by a module with amplitude dependent nonlinearity;
• at least one filter to filter signals including signals of the dummy frequency bandwidth from output of the module to provide a linearized output.

A linearization apparatus for processing an amplitude modulated source signal having a source frequency bandwidth and exhibiting a source signal envelope, the apparatus comprising:

• envelope computing means for utilizing the source signal to compute a dummy envelope that would yield a predetermined constant if the source and dummy signal envelopes were combined;
• dummy signal generating means for producing an amplitude modulated dummy signal exhibiting the computed dummy envelope, where the dummy signal occurs at a dummy frequency bandwidth that differs from the source frequency bandwidth;
• adding means for adding the source signal and the dummy signal to form a combined signal available for processing by a module with amplitude dependent nonlinearity;
• filtering means for removing signals including signals of the dummy frequency bandwidth from an output of the module to provide a linearized output.