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IEEE/ICACT20210252 Question.1 Questioner: lijingwei10@huawei.com 2021-02-09 오후 8:28:34	IEEE/ICACT20210252 Answer.1 Answer by Auhor ra-maneekut@kddi-research.jp 2021-02-09 오후 8:28:34
Does the constellation gain have a theoretical upper limit? And What is the gap between your results and the theoretical upper limit?	The theoretical upper bound of the constellation shaping can be obtained from mutual information (MI) which is the metric for symbol-wise (SW) soft decision (SD) decoder. Since we optimized the constellation based on MAP-BER using bit-wise hard decision decoder, there are some gaps between those two decision method. By the way, the gap in achieved information rate (AIR) vs SNR curve between MI and HD-GMI (converted from MAP-BER) are less than 1 dB roughly.

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