PAM-6 Coded Modulation for IM/DD Channels with a Peak-Power Constraint

2021/04/29 by Prinz, Tobias, Wiegart, Thomas, Plabst, Daniel +4 · 1 citation
#FOS: Computer and information sciences #Information Theory (cs.IT)

paper · doi:10.48550/arxiv.2104.14304

Abstract

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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• A New 5 bit/2D-symbol Modulation Format for Relative Intensity Noise-dominated IM-DD Systems

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