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PAM-6 Coded Modulation for IM/DD Channels with a Peak-Pow...
Tobias Prinz, Thomas Wiegart, Daniel Plabst, Stefano Calabrò, Ge · 2021-04-29 · via cs.IT updates on arXiv.org

Coded modulation with probabilistic amplitude shaping (PAS) is considered for intensity modulation/direct detection channels with a transmitter peak-power constraint. PAS is used to map bits to a uniform PAM-6 distribution and outperforms PAM-8 for rates up to around 2.3 bits per channel use. PAM-6 with PAS also outperforms a cross-shaped QAM-32 constellation by up to 1 dB and 0.65 dB after bit-metric soft- and hard decoding, respectively. An alternative PAM-6 scheme based on a framed cross-shaped QAM-32 constellation is proposed that shows similar gains.

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