Digital Predistortion for nonlinear RF power amplifiers
First Claim
1. A system, comprising:
- processor electronics configured to produce a digital transmit signal;
a first convertor to convert the digital transmit signal to an analog transmit signal;
a power amplifier to amplify the analog transmit signal to produce an amplified analog transmit signal, wherein the power amplifier has one or more nonlinear characteristics;
receiver circuitry to receive an analog receive signal in different modes comprising an operational mode and a predistortion training mode, the receiver circuitry being configured to receive the amplified analog transmit signal as the analog receive signal in the predistortion training mode;
a second convertor to convert the analog receive signal to a digital receive signal; and
a receive filter coupled between the receiver circuitry and the second convertor, wherein the receive filter is configured to operate at a first bandwidth during the operational mode and operate at a second bandwidth during the predistortion training mode, and the second bandwidth being wider than the first bandwidth,wherein the processor electronics are configured to (i) operate the system in the predistortion training mode to gather information to estimate one or more predistortion parameter values, and (ii) use the one or more predistortion parameter values to predistort digital signals to compensate for the one or more nonlinear characteristics of the power amplifier when operating in the operational mode, wherein the information comprises transmit samples that are based on the digital transmit signal and receive samples that are based on the digital receive signal.
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Accused Products
Abstract
Systems and techniques relating to wireless communications are described. A described technique includes operating a device, that includes a receive filter, in different modes comprising an operational mode and a predistortion training mode, where the receive filter is configured to operate at a first bandwidth during the operational mode and operate at a second, wider bandwidth during the predistortion training mode; generating a digital transmit signal; receiving a digital receive signal via the receive filter, causing, in the predistortion training mode, the digital receive signal to be based on an amplified analog version of the digital transmit signal, the amplified analog version being produced by a power amplifier having a nonlinear characteristic(s); estimating predistortion parameter value(s) using samples of the digital transmit signal and samples of the digital receive signal; and using the predistortion parameter value(s) to predistort digital signals to compensate for the nonlinear characteristic(s) of the power amplifier.
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Citations
20 Claims
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1. A system, comprising:
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processor electronics configured to produce a digital transmit signal; a first convertor to convert the digital transmit signal to an analog transmit signal; a power amplifier to amplify the analog transmit signal to produce an amplified analog transmit signal, wherein the power amplifier has one or more nonlinear characteristics; receiver circuitry to receive an analog receive signal in different modes comprising an operational mode and a predistortion training mode, the receiver circuitry being configured to receive the amplified analog transmit signal as the analog receive signal in the predistortion training mode; a second convertor to convert the analog receive signal to a digital receive signal; and a receive filter coupled between the receiver circuitry and the second convertor, wherein the receive filter is configured to operate at a first bandwidth during the operational mode and operate at a second bandwidth during the predistortion training mode, and the second bandwidth being wider than the first bandwidth, wherein the processor electronics are configured to (i) operate the system in the predistortion training mode to gather information to estimate one or more predistortion parameter values, and (ii) use the one or more predistortion parameter values to predistort digital signals to compensate for the one or more nonlinear characteristics of the power amplifier when operating in the operational mode, wherein the information comprises transmit samples that are based on the digital transmit signal and receive samples that are based on the digital receive signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method, comprising:
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operating a device, that includes a receive filter, in different modes comprising an operational mode and a predistortion training mode, wherein the receive filter is configured to operate at a first bandwidth during the operational mode and operate at a second bandwidth during the predistortion training mode, the second bandwidth being wider than the first bandwidth; generating a digital transmit signal; receiving a digital receive signal via circuitry that comprises the receive filter; causing, in the predistortion training mode, the digital receive signal to be based on an amplified analog version of the digital transmit signal, wherein the amplified analog version is produced by a power amplifier having one or more nonlinear characteristics; storing signal samples responsive to the device being in the predistortion training mode, the signal samples including transmit samples based on the digital transmit signal and receive samples based on the digital receive signal; estimating one or more predistortion parameter values using information comprising the transmit samples and the receive samples; and using the one or more predistortion parameter values to predistort digital signals to compensate for the one or more nonlinear characteristics of the power amplifier. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A non-transitory computer-readable medium embodying a program operable to cause a device to perform operations, the operations comprising:
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causing the device, that comprises a receive filter, to operate in different modes comprising an operational mode and a predistortion training mode, wherein the receive filter is configured to operate at a first bandwidth during the operational mode and operate at a second bandwidth during the predistortion training mode, the second bandwidth being wider than the first bandwidth; generating a digital transmit signal; receiving a digital receive signal via circuitry that comprises the receive filter; causing, in the predistortion training mode, the digital receive signal to be based on an amplified analog version of the digital transmit signal, wherein the amplified analog version is produced by a power amplifier having one or more nonlinear characteristics; storing signal samples responsive to the device being in the predistortion training mode, the signal samples including transmit samples based on the digital transmit signal and receive samples based on the digital receive signal; estimating one or more predistortion parameter values using information comprising the transmit samples and the receive samples; and using the one or more predistortion parameter values to predistort digital signals to compensate for the one or more nonlinear characteristics of the power amplifier. - View Dependent Claims (17, 18, 19, 20)
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Specification