Samsung Research Proposes Systematic Probabilistic Shaping for 6G Modems

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Samsung Research introduces Systematic Probabilistic Shaping (S-PS), a modulation enhancement that optimizes symbol transmission probabilities rather than constellation geometry to reduce the gap to Shannon capacity.
AWGN channel simulations show S-PS achieves approximately 1.5 dB SNR gain over uniform QAM at equal spectral efficiency across 64-QAM, 256-QAM, and 1024-QAM configurations.
The design shapes only the second-most-significant bit (2nd MSB) of in-phase and quadrature components, aligning shaped bits with the systematic bits of NR LDPC codewords to preserve compatibility with existing 5G NR processing chains.
Implementation requires distribution matching and dematching for the selected subblock, with receiver metrics adjusted for nonuniform symbol probabilities; the architecture supports parallel processing to manage throughput and latency constraints.
S-PS is relevant for applications requiring sustained high data rates in limited spectrum, such as Fixed Wireless Access (FWA), wireless backhaul, and immersive communication services.

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