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Protograph-Based LDPC Code Design for Probabilistic Shapi...
Alexandru Dominic Git, Balázs Matuz, Fabian Steiner · 2019-01-11 · via cs.IT updates on arXiv.org

This work investigates protograph-based LDPC codes for the AWGN channel with OOK modulation. A non-uniform distribution of the OOK modulation symbols is considered to improve the power efficiency especially for low SNRs. To this end, a specific transmitter architecture based on time sharing is proposed that allows probabilistic shaping of (some) OOK modulation symbols. Tailored protograph-based LDPC code designs outperform standard schemes with uniform signaling and off-the-shelf codes by 1.1 dB for a transmission rate of 0.25 bits/channel use.

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