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IEEE/ICACT20210252 Question.4 Questioner: gueye.ibrahima1@esp.sn 2021-02-10 오후 9:45:47	IEEE/ICACT20210252 Answer.4 Answer by Auhor ra-maneekut@kddi-research.jp 2021-02-10 오후 9:45:47
Hello, thank you for the presentation, what are the crystals you used to make the comparison between the optimized constellations and the regular square 64-QAM constellations.	If my understanding is correct, the questioner ask that what metric that I use to compare both constellations ? In this case, we consider hard decision decoding method so we use the MAP-BER as the metric. The threshold of BER is at 1e-2 which is the level of FEC limit assuming 20% overhead. The difference in SNR at that threshold is obtained as the shaping gain between 2 constellations.

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