Advanced adaptive pre-distortion in a radio frequency...

Pulse or digital communications – Transmitters – Antinoise or distortion

Reexamination Certificate

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C375S296000, C455S063100, C455S114300

Reexamination Certificate

active

06973138

ABSTRACT:
The present invention is related to methods and apparatus that advantageously permit the more efficient use of an input range of an analog-to-digital converter used by an adaptive predistortion linearized RF transmitter. A main signal component of a down-converted output of an RF transmitter is removed prior to the analog-to-digital conversion of the down-converted output, thereby allowing more of the input range of the analog-to-digital converter to capture an error signal component of the down-converted output. Embodiments of the present invention can thus adaptively tune the predistortion stage to a higher degree of linearity or can use lower cost analog-to-digital converters with fewer quantization steps for the same performance.

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