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Feasibility study of adaptive LUT-based pre-distorter for OFDM in non-linear satellite downlink channel

Janaaththanan, S, Kasparis, C, Evans, BG, Novella, JIM and Casado, AC (2006) Feasibility study of adaptive LUT-based pre-distorter for OFDM in non-linear satellite downlink channel Proceedings of the 2006 International Workshop on Satellite and Space Communications. 126 - 129.

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A very significant obstacle in employing Orthogonal Frequency Division Multiplexing (OFDM) in wideband satellite systems is its sensitivity to the non-linear response of the on-board Traveling wave Tube Amplifier (TWTA). Since satellite systems are power limited, backing-off the TWTA by a significant amount is not a realistic option. Therefore amplifier linearization techniques need to be employed in order to limit the impact of the non-linear signal distortions. This paper, studies the feasibility of introducing a Look-Up Table (LUT) based pre-distorter at the baseband of the gateway modem for linearizing the on-board TWTA. The LUT pre-distorter uses an adaptation algorithm for up-dating the table parameters according to the drifts in the amplifier's response over time and frequency. The study concentrates on evaluating the performance improvements that can be offered by the LUT pre-distorter, by making realistic assumptions regarding the training process, which in the satellite system needs to be based on the transmission of training sequences that propagate via an imperfect channel.

Item Type: Article
Uncontrolled Keywords: Science & Technology, Technology, Engineering, Aerospace, Telecommunications, Engineering, OFDM, HPA, TWTA, pre-distortion, non-linear distortion, PREDISTORTER, LINEARIZATION, COMPENSATION, SYSTEM
Related URLs:
Divisions: Faculty of Engineering and Physical Sciences > Electronic Engineering > Centre for Communication Systems Research
Depositing User: Melanie Hughes
Date Deposited: 23 Sep 2010 15:20
Last Modified: 23 Sep 2013 18:38

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