Constellation optimization for nonlinear satellite channels
Date
2017
Authors
Mehboob, A.
Layton, K.
Cowley, W.
Lechner, G.
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Conference paper
Citation
Proceedings of the International Astronautical Congress, IAC, 2017, vol.7, pp.4757-4763
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68th International Astronautical Congress: Unlocking Imagination, Fostering Innovation and Strengthening Security, IAC 2017 (25 Sep 2017 - 29 Sep 2017 : Adelaide, South Australia)
Abstract
In this paper, we propose a direct amplitude phase shift keying (APSK) constellation optimization method for nonlinear satellite channels. Our method minimizes the symbol error rate (SER) at the receiver by taking into account the nonlinear distortion caused by power amplifier (PA) and filters in the signal chain. It shows better SER performance for higher order constellations, such as 64-APSK, where outer rings suffer from relatively higher nonlinear distortion. In addition, we have also identified a new 64-APSK constellation that performs better in terms of mutual information and SER than standard constellation. SER simulations have been performed with an accurate model of a traveling-wave tube amplifier (TWTA), obtained from real earth observation (EO) satellite data, showing that our method provides symbol energy to noise spectral density ratio (/0) gain of 0.5 dB over existing methods. We have also performed hardware-in-the-loop tests, using a custom built testbed in the lab, to validate our simulation results.
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Copyright 2017 International Astronautical Federation