A Note on Probabilistic and Geometric Shaping for the AWGN Channel
A Note on Probabilistic and Geometric Shaping for the AWGN Channel
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关于 AWGN 信道的概率和几何整形的注释
DOI：
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发表时间：
2020
期刊：
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通讯作者：
R. Leonardi
中科院分区：
文献类型：
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作者：
Roberto Modonesi;M. Dalai;P. Migliorati;R. Leonardi
在考虑AWGN信道的编码调制方案时，两个主要的实际限制阻碍了信道容量的实现，即需要使用有限的星座和编码效率低下。最近，Böcherer等人将概率形ASK星座与LDPC编码相结合，为星座塑造提供了新的推动力。一个悬而未决的问题是，他们的结果离基于有限星座的最优解有多远。我们研究了这个问题，并通过实验分析表明，大部分的损失是由于低效的编码设计，而增加二维几何整形的好处不大。
When considering coded modulation schemes for the AWGN channel, two main practical limitations prevent achieving channel capacity, namely the need to use a finite constellation and coding inefficiencies. Constellation shaping was given new impetus in recent works by Böcherer et al., which combined probabilistically shaped ASK constellations with LDPC coding. One open question is how far their results are from optimal solutions based on the use of finite constellations. We investigate this issue and show through experimental analysis that most of the loss is due to inefficient coding design and little benefits should be expected by adding two-dimensional geometric shaping.