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Physical layer rateless codes for the SATCOM on‐the‐move system with blockage
Author(s) -
Dai Jingke,
Zhao Peng,
Zhang Fenggan,
Chen Xiao
Publication year - 2020
Publication title -
international journal of satellite communications and networking
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.388
H-Index - 39
eISSN - 1542-0981
pISSN - 1542-0973
DOI - 10.1002/sat.1365
Subject(s) - computer science , raptor code , online codes , luby transform code , additive white gaussian noise , binary erasure channel , channel (broadcasting) , fountain code , erasure , decoding methods , low density parity check code , tornado code , forward error correction , algorithm , turbo code , computer network , block code , concatenated error correction code , channel capacity , programming language
Summary Physical layer rateless codes are employed to mitigate the link‐blockage in satellite communication on‐the‐move (SOTM) systems. Both nonsystematic raptor (NR) codes and systematic raptor (SR) codes are investigated, where the blockage‐channel is modelled as an additive white Gaussian noise‐contaminated binary erasure channel (AWGN‐BEC). The asymptotic performance of NR codes is obtained by extrinsic information transfer (EXIT) method, and it is proved theoretically that NR codes have capacity‐approaching performance on this channel. A modified EXIT method is proposed to analyze the asymptotic performance of SR codes since the channel outputs not only continuous message but also discrete message. Due to the poor performance of existing SR codes on blockage‐channels, the degree distributions are optimized and the resulting codes show much better performance. Moreover, the raptor codes are compared with hybrid automatic repeat request (HARQ) schemes in satellite communication systems.