Method and apparatus for a nonlinear feedback control system
AssigneePine Valley Investments, Inc.
InventorsWalid Khairy Mohamed Ahmed, Qing Li
Life of this patent
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Abstract
A method and apparatus for a nonlinear feedback control system is disclosed, such as for electrical and electronic systems, for pre-distorting a nonlinear device. A nonlinear feedback control system includes a nonlinear device having a first input and a first output. A detection stage is in communication with the first output of the nonlinear device. A derivation stage is in communication with the detection stage, and the derivation stage is in communication with the first input of the nonlinear device.
Claims15
A method for pre-distorting a nonlinear device, comprising:
- generating a first output signal from the nonlinear device;
- detecting a first plurality of feedback data values from the first output signal;
- extrapolating a current variation value from the first plurality of feedback data values;
- deriving a first pre-distortion value from the first plurality of feedback data values using the current variation value;
- generating a first input signal based on the first pre-distortion value;
- and
- providing the first input signal to the nonlinear device;
- extrapolation of the current variation value being bypassed by using a previous variation value if a noise level of at least one of the first plurality of feedback data values is above a threshold noise level.
A method for pre-distorting a nonlinear device, comprising:
- generating an output signal from the nonlinear device;
- detecting a plurality of feedback data values from the output signal;
- extrapolating a variation value from the plurality of feedback data values if an expected output signal value is beyond a range of feedback data values already detected and if a noise level of at least one of the plurality of feedback values is below a threshold;
- calculating a pre-distortion value using the variation value;
- generating an input signal based on the pre-distortion value;
- providing the input signal to the nonlinear device;
- processing the pre-distortion value;
- storing the processed pre-distortion value in a look-up-table;
- and
- storing a feedback data value corresponding to the processed pre-distortion value in the look-up-table.
A nonlinear feedback control system, comprising:
- a nonlinear device having a first input and a first output and configured to generate a first output signal;
- a detection stage in communication with the first output of the nonlinear device and configured to detect a first plurality of feedback data values from the first output signal;
- a derivation stage in communication with the detection stage and configured to derive a first pre-distortion value from the first plurality of feedback data values, said derivation stage comprising a closed loop stage configured to extrapolate a current variation value from the first plurality of feedback data values, and calculate the first pre-distortion value using the current variation value;
- and
- the derivation stage being in communication with the first input of the nonlinear device to generate a first input signal based on the first pre-distortion value and provide the first input signal to the nonlinear device;
- extrapolation of the current variation value being bypassed by using a previous variation value if a noise level of at least one of the first plurality of feedback data values is above a threshold noise level.
Dependencies are inferred from the claim text.