Adaptive predistortion for a transmit system
First Claim
1. A method, comprising:
- decomposing an input signal into at least two separate components, the at least two separate components being processed separately;
deliberately predistorting the at least two separate components, responsive to an entry in a lookup table, to produce at least two predistorted signals, the deliberate predistortion being configured to compensate for distortion in an output signal; and
combining the predistorted signals to produce the output signal.
1 Assignment
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Accused Products
Abstract
Systems, methods, and devices relating to the provision of deliberate predistortion to an input signal to compensate for distortions introduced by an amplifier subsystem. An input signal is received by a signal processing system which includes a predistortion subsystem. The input signal is decomposed and the fragments are then predistorted by the predistortion subsystem by applying a deliberate predistortion to the fragments. The predistorted fragments are then separately processed and recombined to arrive at the system output signal. The predistortion subsystem adaptively adjusts based on characteristics of the system output signal. Also, the predistortion subsystem is equipped with a control system that is state based—the state of the predistortion subsystem is dependent upon the prevailing conditions and, when required, the control system switches the state of the predistortion subsystem. A feedback signal, a replica of the system output signal, is used in updating lookup table entries used to determine the predistortion.
64 Citations
15 Claims
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1. A method, comprising:
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decomposing an input signal into at least two separate components, the at least two separate components being processed separately; deliberately predistorting the at least two separate components, responsive to an entry in a lookup table, to produce at least two predistorted signals, the deliberate predistortion being configured to compensate for distortion in an output signal; and combining the predistorted signals to produce the output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method, comprising:
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decomposing an input signal into at least two component signals; applying a deliberate predistortion to each of the at least two component signals to produce at least two predistorted signals according to an entry retrieved from a lookup table; combining the at least two predistorted signals to produce an output signal; and adjusting the deliberate predistortion based on at least one characteristic of the output signal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification