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Proceedings Paper

A new predistortion based on the double-mode adaptive technique for satellite communications
Author(s): Henghui Wang; Hao Zhang; Wu Ye; Suili Feng
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Paper Abstract

Satellite communication channels are equipped with the Traveling Wave Tube (TWT) amplifiers which cause severe nonlinear distortions when they work near saturation. In this paper, a new predistorter is designed based on the double-mode adaptive technique. Firstly, a neural network is used to design the amplitude predistorter, and the error-filtering scheme is applied to improve the classical structure of adaptive control, hence the convergent process turns to be rapid by using the LMS algorithm. Secondly, a real polynomial is applied to identify the phase character of TWT, and then the negative polynomial is copied to the transmitted path. Simulation results show that the compensated system is characterized by the approximately ideal amplifier within the range of saturated input value.

Paper Details

Date Published: 1 December 2005
PDF: 5 pages
Proc. SPIE 5985, International Conference on Space Information Technology, 598512 (1 December 2005); doi: 10.1117/12.656801
Show Author Affiliations
Henghui Wang, South China Univ. of Technology (China)
Hao Zhang, South China Univ. of Technology (China)
Wu Ye, South China Univ. of Technology (China)
Suili Feng, South China Univ. of Technology (China)


Published in SPIE Proceedings Vol. 5985:
International Conference on Space Information Technology

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