Cartesian Pre-distortion using a Sigma Delta Modulator for Multi-Standard RF Power Amplifiers
Finnerty, Keith and Dooley, John and Farrell, Ronan (2012) Cartesian Pre-distortion using a Sigma Delta Modulator for Multi-Standard RF Power Amplifiers. In: 23rd Irish Signals and Systems Conference, June 28-29 2012, Maynooth, Ireland.
The system implements a pre-distortion algorithm for a non-linear PA by placing a pseudo static forward model of a PA in the feedback path of a Sigma Delta Modulator. Performing the predistortion in this way reduces the computation overhead incurred in calculating pre-distorter weights for a given power amplifier. In this paper a Cartesian LUT is used to represent the PA model, allowing the system to compensate for PA non-linearity caused by multiple signal standards. The system was tested using 3 modulation standards and showed improvement of up to 28dB while the PA model remained constant.
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