{'fraction_non_alphanumeric': 0.0286368843069874, 'fraction_numerical': 0.004581901489117984, 'mean_word_length': 4.905405405405405, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Rateless Codes Performance Analysis in Correlated Channel Model for GEO Free Space Optics Downlinks

Attenuation and fading events can corrupt Free Space Optical (FSO) links. It would be so recommended to add mitigation error codes on the communication links. FSO channel can be described as an erasure channel (fading events can cause erasure errors), and we have identified in rateless codes (RCs) a suitable solution to be employed in FSO links. RCs do not need feedback and they add a redundant coding (also tunable on-thefly as needed) on the source data able to recover the whole payload, despite erasure errors. We implemented two different rateless codes: Luby Transform (LT),Raptor and RaptorQ. We also analyzed code performances on a simulated turbulent GEO FSO downlink (1 Gbps – OOK modulation) at a 1,06 μm wavelength and for different values of zenith angles.