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AssigneeCrestCom, Inc.
InventorsRonald Duane McCallister, Eric M. Brombaugh
Estimating the term…
A transmitter (50) includes a low power nonlinear predistorter (58) that inserts predistortion configured to compensate for a memoryless nonlinearity (146) corresponding to gain droop and another memoryless nonlinearity (148) corresponding to a video signal. When efforts are taken to reduce memory effects, such as configuring a network of components (138) that couple to an HPA (114) to avoid resonance frequencies substantially throughout a video bandwidth (140), high performance linearization at low power results without extending linearization beyond that provided by the memoryless nonlinear predistorter (58). A look-up table (282) has address inputs responsive to a magnitude parameter (152) of a communication signal (54). A pre-distorted communication signal (60) is responsive to the output of the look-up table, a derivative signal (204), and possibly one or more variable bias parameters (85). The look-up table (282) is updated in response to an LMS control loop.
A method of linearizing a transmitter having an amplifier which applies a nonlinear amplifier transform to a signal input at said amplifier, said method comprising:
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A linearized transmitter having an amplifier which applies a nonlinear amplifier transform to a signal input at said amplifier, said transmitter comprising:
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A linearized transmitter as claimed 12 wherein said polynomial generator has an input coupled to an output of said differentiator.
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A linearized transmitter having an amplifier which applies a nonlinear amplifier transform to a signal input at said amplifier, said transmitter comprising:
Dependencies are inferred from the claim text.