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.
Claims8
A non-transitory computer readable information storage media having instructions stored thereon, that when executed by one or more processors, cause to be performed a method of operating a communications system 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 bandwidth less than the first bandwidth;
- transmitting the filtered signal using an antenna;
- frequency translating the amplified signal to an intermediate frequency signal;
- sampling the intermediate frequency 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 method of operating a communications system 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 bandwidth less than the first bandwidth;
- transmitting the filtered signal using an antenna;
- frequency translating the amplified signal to an intermediate frequency signal;
- sampling the amplified intermediate frequency 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.
The method comprising:
- receiving a signal at a digital predistorter (DPD);
- coupling a finite impulse response (FIR) filter between the DPD and a digital-to-analog converter;
- modulating an output of the digital-to-analog converter using a modulator;
- amplifying the modulated signal;
- filtering the amplified signal;
- transmitting the filtered signal using an antenna;
- frequency translating the amplified signal to an intermediate frequency signal;
- sampling the amplified intermediate frequency 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.
Dependencies are inferred from the claim text.