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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.

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Abstract

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.

Item Type: Conference or Workshop Item (Paper)
Additional Information: This project is funded by the HEA under PRTLI5 and is being co-funded by the Irish Government and the EU under Ireland’s Structural Funds Programmes 2007-2013. The authors would also like to gratefully acknowledge this support of Science Foundation Ireland under grant number 08/CE/I1523.
Keywords: Sigma Delta; Predistortion; Power amplifiers; Multi-standard;
Subjects: Science & Engineering > Electronic Engineering
Item ID: 3953
Depositing User: Dr. Ronan Farrell
Date Deposited: 23 Oct 2012 14:54
Refereed: Yes
URI:

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