Patent ID: 8537041

Claim:
A signal-processing system that generates an analog output signal from a digital input signal, each digital signal in the system having a corresponding sample rate, the system comprising: a digital pre-distortion (DPD) sub-system configured to perform DPD processing to generate a final pre-distorted digital signal from the digital input signal, wherein the DPD sub-system interpolates the digital input signal based on an interpolation factor greater than one prior to performing the DPD processing; a digital-to-analog converter (DAC) configured to convert the final pre-distorted digital signal into an analog pre-distorted signal; and an analog sub-system configured to generate the analog output signal from the analog pre-distorted signal, wherein the DPD sub-system comprises: a pre-DPD processor configured to generate one or more versions of the digital input signal, wherein the pre-DPD processor is configured to apply at least one interpolation filter based on the interpolation factor to the digital input signal to generate at least one version of the digital input signal; a digital pre-distorter configured to pre-distort the one or more versions of the digital input signal to generate one or more intermediate pre-distorted digital signals; and a post-DPD processor configured to generate the final pre-distorted digital signal from the one or more intermediate pre-distorted digital signals.