System and method for increasing bandwidth for digital predistortion in multi-channel wideband communication systems
AssigneeDali Systems Co. Ltd.
InventorsWan-Jong Kim, Shawn Patrick Stapleton
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Abstract
A method of operating a communications system includes receiving a signal at a digital predistorter (DPD), introducing predistortion to the signal using the DPD, and converting the predistorted signal to an analog signal using a digital-to-analog converter having a first bandwidth. The method also includes amplifying the analog signal, sampling the amplified signal using an analog-to-digital converter having a second bandwidth less than the first bandwidth, and extracting coefficients of the DPD from the sampled signal.
Claims17
A method of operating a communications system, the method comprising:
- receiving a signal at a digital predistorter (DPD) having a DPD bandwidth;
- introducing predistortion to the signal using the DPD;
- converting the predistorted signal to an analog signal using a digital-to-analog converter having a first bandwidth;
- modulating the analog signal using a modulator;
- amplifying the modulated signal;
- filtering the amplified signal using a duplexer having a duplexer bandwidth less than the first bandwidth;
- transmitting the filtered signal using an antenna;
- sampling the amplified signal using an analog-to-digital converter having a second bandwidth less than the first bandwidth;
- and
- extracting coefficients of the DPD from the sampled signal.
A communications system comprising:
- a digital predistorter (DPD) configured to predistort an input signal and to produce a DPD output signal having a DPD bandwidth;
- a digital-to-analog converter having a first bandwidth, the digital-to-analog converter configured to convert the DPD output signal to an analog signal;
- a modulator configured to modulate the analog signal;
- a power amplifier configured to amplify the modulated analog signal to produce a power amplifier output signal;
- a duplexer configured to filter the power amplifier output signal to produce a filtered signal, wherein the duplexer has a duplexer bandwidth less than the first bandwidth;
- an antenna configured to transmit the filtered signal;
- and
- an analog-to-digital converter having a second bandwidth less than the first bandwidth, the analog-to-digital converter configured to convert the power amplifier output signal to a digital signal,
- wherein the digital signal includes coefficients configured to be input to the DPD.
A communications system comprising:
- a digital predistorter (DPD) configured to generate a DPD output signal based on an input signal, the DPD initially using a set of first DPD coefficients, wherein the DPD has a DPD bandwidth;
- a digital-to-analog converter having a first bandwidth, the digital-to-analog converter configured to sample the DPD output signal to produce an analog signal;
- a modulator configured to modulate the analog signal;
- a power amplifier configured to amplify the modulated analog signal to produce a power amplifier output signal;
- a duplexer configured to filter the power amplifier output signal to produce a filtered signal, wherein the duplexer has a duplexer bandwidth less than the first bandwidth;
- an antenna configured to transmit the filtered signal;
- and
- feedback components having a second bandwidth less than the first bandwidth, the feedback components configured to sample the power amplifier output signal to produce a digital signal,
- wherein the digital signal includes a next set of DPD coefficients.
Dependencies are inferred from the claim text.