Combined Data Predistortion and Nonuniform Distribution for 16QAM over the Nonlinear Satellite Channel

Conference: TURBO - CODING - 2006 - 4th International Symposium on Turbo Codes & Related Topics; 6th International ITG-Conference on Source and Channel Coding
04/03/2006 - 04/07/2006 at Munich, Germany

Proceedings: TURBO - CODING - 2006

Pages: 6Language: englishTyp: PDF

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Burnet, Craig E.; Ngo, Nghia H.; Pietrobon, Steven S.; Cowley, William G. (Institute for Telecommunications Research, University of South Australia, Mawson Lakes SA 5095, Australia)
Pietrobon, Steven S. (Small World Communications, 6 First Avenue, Payneham South SA 5070, Australia)

The nonlinear satellite channel represents an interesting environment in which to optimize the performance for the transmission of coded 16QAM. In this paper, we investigate the adverse effects of the nonlinear satellite channel, which gives insight into the process for optimizing performance. A packet based data predistortion technique is proposed in conjunction with a non-uniform input distribution in order to maximize the capacity of the received signal whilst minimizing the nonlinear distortion components present in a nonlinear channel.We propose a technique with a non-uniform 16QAM modulation using a parallel concatenated turbo coded system with iterative demapping and decoding. Recent work in the literature has examined 4-12APSK structures for 16QAM transmission, where this paper presents the performance for the classical square QAM constellation.