System and method for increasing bandwidth for digital predistortion in multi-channel wideband communication systems

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.

What is claimed is: 
     
         1 . 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;   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.