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. AbstractThe 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. | 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. |
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| Keywords: | Sigma Delta; Predistortion; Power amplifiers; Multi-standard; |
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| Subjects: | Science & Engineering > Electronic Engineering |
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| ID Code: | 3953 |
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| Deposited By: | Dr. Ronan Farrell |
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| Deposited On: | 23 Oct 2012 15:54 |
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| Refereed: | Yes |
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| URL: | http://www.imws.nuim.ie, http://www.issc.ie/ |
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