DIGITAL COMPENSATION FOR A NON-LINEAR ANALOG RECEIVER
First Claim
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1. A digital compensator comprising:
- at least one fixed, discrete-time (DT), linear time invariant (LTI) filter that provides an output signal z[n] and that is configured based on the known non-linear aspects of an analog receiver to a continuous time input signal x(t);
a reduced-complexity, discrete-time, nonlinear compensator that follows the fixed, discrete-time (DT), linear time invariant (LTI) filter to receive the output signal z[n] and provides a compensated output signal u[n];
wherein the digital compensator is configured to substantially reduce the one or more nonlinear distortion components in a sampled digital output signal of the analog receiver y[n] to provide the output signal u[n] achieving a receiver linearity requirement for the combination of the analog receiver and the digital compensator.
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Abstract
Aspects and embodiments are directed to non-linear systems including a digital compensator structure, a method of digital compensation, and methods for designing digital compensator structures for analog receivers. A digital compensator is configured to substantially reduce the one or more nonlinear distortion components in the sampled digital output signal from the analog receiver to provide an output signal achieving a receiver linearity requirement for the combination of the analog receiver and a digital compensator.
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Citations
35 Claims
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1. A digital compensator comprising:
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at least one fixed, discrete-time (DT), linear time invariant (LTI) filter that provides an output signal z[n] and that is configured based on the known non-linear aspects of an analog receiver to a continuous time input signal x(t); a reduced-complexity, discrete-time, nonlinear compensator that follows the fixed, discrete-time (DT), linear time invariant (LTI) filter to receive the output signal z[n] and provides a compensated output signal u[n]; wherein the digital compensator is configured to substantially reduce the one or more nonlinear distortion components in a sampled digital output signal of the analog receiver y[n] to provide the output signal u[n] achieving a receiver linearity requirement for the combination of the analog receiver and the digital compensator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A non-linear digital compensation system, comprising:
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an analog receiver having a plurality of analog circuit components and an analog-to-digital converter, at least some of the analog circuit components having known nonlinear response characteristics to a continuous time input signal x(t), the analog receiver configured to receive the continuous time input signal x(t) and provide a sampled digital output signal y[n], which has one or more nonlinear distortion components; and a digital compensator coupled to an output of the analog receiver, the digital compensator comprising at least one fixed, discrete-time (DT), linear time invariant (LTI) filter that provides an output signal z[n] and that is configured based on the known non-linear aspects of the analog receiver to a continuous time input signal x(t), followed by at least one reduced-complexity, discrete-time, nonlinear compensator that provides a compensated output signal u[n], the digital compensator configured in combination with the analog receiver to substantially reduce the one or more nonlinear distortion components in the sampled digital output signal of the analog receiver y[n] to provide an output signal u[n] achieving a receiver linearity requirement for the combination of the analog receiver and a digital compensator. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method for designing a non-linear compensator system, comprising:
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characterizing nonlinearities in an analog receiver design, the analog receiver configured to receive a continuous time input signal x(t) and provide a sampled digital output signal y[n]; designing a digital compensator for the analog receiver design based on the nonlinearities, the digital compensator configured to substantially reduce the nonlinearities in a sampled digital output signal y[n] of the analog receiver to provide an output signal u[n], the digital compensator comprising at least one fixed, discrete-time (DT), linear time invariant (LTI) filter configured based on the non-linearities of the analog receiver to a continuous time input signal x(t) that provides an output signal z[n] followed by at least one reduced-complexity, discrete-time, nonlinear compensator that provides a compensated output signal u[n]. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification