Baseband equivalent volterra series for digital predistortion in multi-band power amplifiers
AssigneeTelefonaktiebolaget L M Eric Sson (Publ)
InventorsBilel FEHRI, Slim BOUMAIZA
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Abstract
Methods, systems and apparatus for modelling a power amplifier and pre-distorter fed by a multi-band signal are disclosed. According to one aspect, a method includes receiving a multi-band signal and generating a discrete base band equivalent, BBE, Volterra series based on the received multi-band signal, where the series has distortion products grouped according to determined shared kernels. The shared kernels are determined based on a transformation of a real-valued continuous-time pass band Volterra series without pruning of kernels.
Claims21
A method of modelling a power amplifier fed by a multi-band signal input, the method comprising:
- receiving a multi-band signal;
- generating a discrete base band equivalent, BBE, Volterra series based on the received multi-band signal, the series having distortion products grouped according to determined shared kernels;
- and
- the shared kernels being determined based on a transformation of a real-valued continuous-time pass band Volterra series without pruning of kernels.
A digital pre-distorter (DPD) system, comprising:
- a Volterra series DPD modelling unit, the DPD modelling unit configured to:
- calculate a discrete base band equivalent, BBE, Volterra series, the series having distortion products grouped according to determined shared kernels;
- and
- the shared kernels being determined based on a transformation of a real-valued continuous-time pass band Volterra series without pruning of kernels.
A Volterra series digital pre-distorter, DPD, modelling unit, comprising:
- a memory module, the memory module configured to store terms of a discrete base band equivalent, BBE, Volterra series;
- a grouping module, the grouping module configured to group distortion products of the series according to determined shared kernels;
- a shared kernel determiner, the shared kernel determiner configured to determine the shared kernels based on a transformation of a real-valued continuous-time pass band Volterra series without pruning of kernels;
- and
- a series term calculator, the series term calculator configured to calculate the terms of the discrete base band equivalent Volterra series, the terms being the distortion products multiplied by their respective shared kernels.
Dependencies are inferred from the claim text.