30 November 2005 A new predistortion based on the double-mode adaptive technique for satellite communications
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Proceedings Volume 5985, International Conference on Space Information Technology; 598512 (2005) https://doi.org/10.1117/12.656801
Event: International Conference on Space information Technology, 2005, Wuhan, China
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.
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Henghui Wang, Henghui Wang, Hao Zhang, Hao Zhang, Wu Ye, Wu Ye, Suili Feng, Suili Feng, "A new predistortion based on the double-mode adaptive technique for satellite communications", Proc. SPIE 5985, International Conference on Space Information Technology, 598512 (30 November 2005); doi: 10.1117/12.656801; https://doi.org/10.1117/12.656801
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