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arXiv 1608.00474cs.ITmath.IT
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几何和概率造型的比较及其在ATSC 3.0中的应用

Comparison of Geometric and Probabilistic Shaping with Application to ATSC 3.0

Fabian Steiner, Georg Böcherer

摘要:

在这项工作中,几何成形(GS)和概率成形(PS)的AWGN信道进行审查。这两种方法的符号度量解码(SMD)和比特度量解码(BMD)。对于GS,基于差分进化的优化算法制定。速率分析表明,GS遭受0.4 dB的性能下降相比,PS BMD时使用。ATSC 3.0调制和编码格式(modcods)的前向纠错模拟证实了理论研究结果。特别地,PS使得能够利用单个modcode进行无缝速率自适应,并且对于每个信道使用大于3.2比特的频谱效率,PS优于ATSC 3.0 GS modcode超过0.5 dB。

英文摘要:

In this work, geometric shaping (GS) and probabilistic shaping (PS) for the 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 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 single 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.

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