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2009 WRI World Congress on Computer Science and Information Engineering
Open-Loop Digital Baseband Predistortion Based on Polynomials
Los Angeles, California USA
March 31-April 02
ISBN: 978-0-7695-3507-4
As for model-based approaches, the polynomial model is a favorite choice due to its simplicity and ease of implementation. In this paper, an odd-order series of magnitude and phase angle form are derived from polynomial model of HPA nonlinearity. In-band distortion can be eliminated by alleviating odd-order terms of the series. Different from conventional feedback predistortion, we use human-computer interface to cancel the odd-order terms that need no feedback loop, i.e. open-loop digital baseband predistortion. Results from both Matlab simulation and small power test show that the open-loop predistortion method can effectively compensate for amplitude and phase nonlinearity and suppress the in-band distortion.
Index Terms:
open-loop, predistortion, polynomials
Zhibin Zeng, Xiangran Sun, Rui Lv, Zhanxin Yang, "Open-Loop Digital Baseband Predistortion Based on Polynomials," csie, vol. 6, pp.194-197, 2009 WRI World Congress on Computer Science and Information Engineering, 2009
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