Adaptive predistortion for a transmit system with gain, phase and delay adjustments
First Claim
Patent Images
1. A system for processing an input signal, the system comprising:
- an adaptive predistortion subsystem for receiving said input signal and for producing a predistorted signal by applying a deliberate predistortion to said input signal;
a signal processing subsystem receiving and processing said predistorted signal and producing a system output signal;
a feedback signal processing subsystem for receiving and processing a feedback signal derived from said system output signal; and
a delay subsystem for providing a delay to a replica of said input signal to produce a delayed signal, said delayed signal being used by said adaptive predistortion subsystem and said feedback processing subsystem, whereinsaid adaptive predistortion subsystem distorts said input signal to compensate for distortions in said system output signal;
said signal processing subsystem decomposes said predistorted signal into separate components, each of said separate components being processed separately;
said processing subsystem combines said components after processing to produce said system output signal;
an output of said feedback processing subsystem being used by said adaptive predistortion subsystem;
said deliberate predistortion applied to said input signal by said adaptive predistortion subsystem to produce said predistorted signal is adjusted based on said system output signal.
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Abstract
Systems and methods relating to the provision of gain, phase and delay adjustments to signals to be used by a predistortion subsystem. A portion of an input signal is delayed by delay elements prior to being received by the predistortion subsystem. The delayed input signal portion is also received by a feedback signal processing subsystem that adjusts the gain and phase of the feedback signal based on the delayed input signal portion. The adjusted feedback signal is used, along with the delayed portion of the input signal, to determine an appropriate predistortion modification to be applied to the input signal.
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22 Claims
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1. A system for processing an input signal, the system comprising:
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an adaptive predistortion subsystem for receiving said input signal and for producing a predistorted signal by applying a deliberate predistortion to said input signal; a signal processing subsystem receiving and processing said predistorted signal and producing a system output signal; a feedback signal processing subsystem for receiving and processing a feedback signal derived from said system output signal; and a delay subsystem for providing a delay to a replica of said input signal to produce a delayed signal, said delayed signal being used by said adaptive predistortion subsystem and said feedback processing subsystem, wherein said adaptive predistortion subsystem distorts said input signal to compensate for distortions in said system output signal; said signal processing subsystem decomposes said predistorted signal into separate components, each of said separate components being processed separately; said processing subsystem combines said components after processing to produce said system output signal; an output of said feedback processing subsystem being used by said adaptive predistortion subsystem; said deliberate predistortion applied to said input signal by said adaptive predistortion subsystem to produce said predistorted signal is adjusted based on said system output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification