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Investigation of punctured LDPC codes and time-diversity on free-space optical links

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5 Author(s)
Czaputa, M. ; Inst. of Broadband Commun., Graz Univ. of Technol., Graz, Austria ; Javornik, T. ; Leitgeb, E. ; Kandus, G.
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In this paper, we analyze the behavior of DVB-S2 un-punctured/punctured low-density parity-check (LDPC) coded on-off-keying (OOK) under atmospheric turbulence conditions by utilizing time diversity. A performance characterization between these schemes is evaluated, where punctured LDPC code provides a penalty of around 0.1 to 0.2 dB against unpunctured LDPC codes but still provides a coding gain of several dB against uncoded OOK. The combination of channel coding and a bit interleaver results in performance improvements in turbulence conditions. For example, such a system can achieve a coding gain of 16.7 dB in moderate turbulence conditions compared to uncoded OOK.

Published in:

Telecommunications (ConTEL), Proceedings of the 2011 11th International Conference on

Date of Conference:

15-17 June 2011