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About this paper
Georg Böcherer, Patrick Schulte, Fabian Steiner
A new coded modulation scheme integrates probabilistic amplitude shaping with DVB-S2 LDPC codes to achieve transmission performance within 1 dB of AWGN capacity across a spectral efficiency range of 1 to 5 bits/s/Hz. The approach employs non-iterative bit-metric decoding and requires significantly fewer distinct transmission modes compared to conventional systems.
Key insights
- Probabilistic Amplitude Shaping, when combined with systematic encoding, enables capacity-approaching performance without requiring complex iterative demapping at the receiver.
- The "uniform check bit assumption" allows parity bits to serve as independent sign labels for constellation points, simplifying the integration of shaping with binary codes.
- Bit-metric decoding is shown to be sufficient, with a negligible gap (less than 0.02 dB) from symbol-metric decoding capacity, thus justifying the simpler receiver architecture.
Summary by alphaXiv.
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