Comparison of Geometric and Probabilistic Shaping with Application to ATSC 3.0
Conference: SCC 2017 - 11th International ITG Conference on Systems, Communications and Coding
02/06/2017 - 02/09/2017 at Hamburg, Germany
Proceedings: SCC 2017
Pages: 6Language: englishTyp: PDF
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Authors:
Steiner, Fabian; Boecherer, Georg (Institute for Communications Engineering Technical University of Munich, Germany)
Abstract:
In this work, geometric shaping (GS) and probabilistic shaping (PS) for the additive white Gaussian noise (AWGN) channel is reviewed. Both approaches are investigated in terms of symbol-metric decoding (SMD) and bit-metric decoding (BMD). For GS, an optimization algorithm based on differential evolution is formulated. Achievable rate analysis reveals that GS suffers from a 0.4 dB signal-to-noise ratio (SNR) performance degradation compared to PS when BMD is used. Forward-error correction simulations of the ATSC 3.0 modulation and coding formats (modcods) confirm the theoretical findings. In particular, PS enables seamless rate adaptation with one modcod and it outperforms ATSC 3.0 GS modcods by more than 0.5 dB for spectral efficiencies larger than 3.2 bits per channel use.