NDLI: Memoryless polynomial adaptive predistortion [TV transmitters]

Content Provider	IEEE Xplore Digital Library
Author	Stonick, J.T. Stonick, V.L. Moura, J.M.F. Zborowski, R.S.
Copyright Year	1995
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Carnegie Mellon Univ., Pittsburgh, PA, USA (Stonick, J.T.; Stonick, V.L.; Moura, J.M.F.)
Abstract	In this paper we investigate algorithms to adaptively adjust the coefficients of memoryless polynomial structures used to precompensate for the nonlinear amplitude and phase distortion of the high-power amplifier in a terrestrial digital television transmitter. The results of the investigation are twofold. First the phase error is a non-Euclidean measure of the absolute symbol error. For small inputs, noise causing a small Euclidean change can create a large phase error. We compensate for this heuristically by not updating the predistorter coefficients for small inputs. This thresholding is shown to decrease the residual error of the phase predistorter. Second, the pre-compensation nature of the amplitude correction requires a modification to the traditional LMS algorithm. This modification will be seen to produce a smaller residual error than traditional LMS. We demonstrate the superior performance of our algorithms via simulations based on the measured characteristics of production high-power amplifiers.
Starting Page	981
Ending Page	984
File Size	410570
Page Count	4
File Format	PDF
ISBN	0780324315
ISSN	15206149
DOI	10.1109/ICASSP.1995.480340
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-05-09
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Polynomials Predistortion Transmitters High power amplifiers Least squares approximation Phase distortion Digital TV Distortion measurement Phase measurement Phase noise
Content Type	Text
Resource Type	Article

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