We investigated a suitable auxiliary channel setting and the gap between Q-factors with hard and soft demapping. The system margin definition should be reconsidered for systems employing complex coded modulation with soft forward error correction.
Cite
@article{arxiv.2002.00560,
title = {On the Performance under Hard and Soft Bitwise Mismatched-Decoding},
author = {Tsuyoshi Yoshida and Mikael Mazur and Jochen Schröder and Magnus Karlsson and Erik Agrell},
journal= {arXiv preprint arXiv:2002.00560},
year = {2024}
}