Run length limited CCSDS convolutional codes for optical communications

Author:

Farkaš Peter12,Divinec Ladislav1,Rakús Martin1

Affiliation:

1. Institute of Multimedia Information and Communication Technologies, Faculty of Electrical Engineering and Information Technology , Slovak University of Technology , Ilkovičova 3, 812 19 Bratislava , Slovakia

2. Institute of Applied Informatics , Pan-European University , FI PEVS Tematínska 10, 851 05 Bratislava Slovakia

Abstract

Abstract This paper presents the construction of RLL-ECCs (run length limited error control codes) from three selected ECCs specified by Consultative Committee for Space Data Systems (CCSDS) for optical communications. The RLL-ECCs obtained present a practical alternative to CCSDS codes with pseudo-randomizers. Their advantage is that the maximal run lengths of equal symbols in their codeword sequences are guaranteed, which is not the case if the common approach with pseudo-randomizers is used. The other advantages are that no additional redundancy is introduced into encoded codewords and that the encoding and decoding procedures of the original error control CCSDS codes do not have to be modified in the following cases: Firstly, if hard decoding is used and the transmission channel can be modeled as a BSC (binary symmetric channel) and secondly, if soft decoding and coherent BPSK (binary phase shift keying) modulation is used and the appropriate transmission channel model is an AWGN (additive white Gaussian noise) channel.

Publisher

Walter de Gruyter GmbH

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