Predistortion circuit for a transmit system
First Claim
1. A system for processing an input signal, the system comprising:
- a signal processing subsystem receiving and processing said input signal and producing a system output signal, and a predistortion subsystem receiving at least two internal input signals and producing at least two predistorted signals by applying a deliberate predistortion to said at least two internal input signals;
wherein said predistortion subsystem distorts said internal input signals to compensate for distortions in said system output signal;
said signal processing subsystem decomposes said input signal into separate components to produce said at least two internal input signals, each of said separate components being processed separately; and
said signal processing subsystem combines said predistorted signals after processing to produce said system output signal.
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Abstract
Systems and methods related to amplifier systems which use a predistortion subsystem to compensate for expected distortions in the system output signal. A signal processing subsystem receives an input signal and decomposes the input signal into multiple components. Each signal component is received by a predistortion subsystem which applies a predistortion modification to the component. The predistortion modification may be a phase modification, a magnitude modification, or a combination of both and is applied by adjusting the phase of the fragment. The predistorted component is then separately processed by the signal processing subsystem. The processing may take the form of phase modulation and amplification. The phase modulated and amplified components are then recombined to arrive at an amplitude and phase modulated and amplified output signal. The predistortion modification is applied to the components to compensate for distortions introduced in the signal by the signal processing subsystem.
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Citations
37 Claims
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1. A system for processing an input signal, the system comprising:
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a signal processing subsystem receiving and processing said input signal and producing a system output signal, and a predistortion subsystem receiving at least two internal input signals and producing at least two predistorted signals by applying a deliberate predistortion to said at least two internal input signals;
whereinsaid predistortion subsystem distorts said internal input signals to compensate for distortions in said system output signal;
said signal processing subsystem decomposes said input signal into separate components to produce said at least two internal input signals, each of said separate components being processed separately; and
said signal processing subsystem combines said predistorted signals after processing to produce said system output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 19, 20, 24, 25, 26, 30)
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12. A method of processing an input signal to produce a system output signal, the method comprising:
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a) receiving said input signal b) decomposing said input signal into at least two component signals c) applying a deliberate predistortion to each of said at least two component signals to produce predistorted signals d) combining said at predistorted signals to produce said system output signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 21, 22, 23, 27, 28, 29)
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32. A system for processing an input signal, the system comprising:
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a combined predistortion and decomposition subsystem, said combined subsystem receiving said input signal and producing at least two predistorted signals derived from said input signal, a signal processing subsystem for receiving said at least two predistorted signals from said combined subsystem, processing said at least two predistorted signals, and producing a system output signal;
whereinsaid at least two predistorted signals are predistorted components of said input signal, a predistortion of said components being to compensate for distortions in said system output signal;
said combined subsystem decomposes said input signal into said components to produce said at least two predistorted signals, each of said separate components being processed separately; and
said signal processing subsystem combines said predistorted signals after processing to produce said system output signal. - View Dependent Claims (33, 34, 35, 36, 37)
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Specification