Patent ID: 7430248

Claim:
A digital predistortion circuit for compensating nonlinear distortion introduced by analog-transmitter components of a digital communications transmitter, said predistortion circuit comprising: a source of a complex-forward-data stream configured to digitally convey information; a basis-function generator coupled to said complex-forward-data-stream source and configured to generate a complex-basis-function-data stream in response to said complex-forward-data stream, wherein said complex-basis-function-data stream is responsive to X(n)·|X(n)| K , where X(n) represents said complex-forward-data stream, and K is an integer greater than or equal to one; a filter coupled to said basis-function generator and configured to generate a complex-filtered-basis-function-data stream in response to said complex-basis-function-data stream; and a combination circuit for combining said complex-filtered-basis-function-data stream and said complex-forward-data stream to compensate for said nonlinear distortion.