Geometrically Shaped Four-Dimensional Modulation Formats for 5–7 Bits/Symbol Designed by Autoencoder

IF 0.3 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC IEICE Communications Express Pub Date : 2024-02-16 DOI:10.23919/comex.2023XBL0179
Akira Naka;Mamoru Komatsu
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Abstract

We design geometrically shaped four-dimensional (4D) modulation formats for 5–7 bits/4D symbol with an autoencoder, which is one of the deep learning applications, using pre-training with 4D formats based on 2-ary amplitude 8-ary phase-shift keying. The numerical evaluation shows that the obtained 4D modulation formats have 0.5-0.7dB signal-to-noise sensitivity gains in terms of normalized generalized mutual information (NGMI) as well as bit error ratio (BER) performances. Furthermore, we show the NGMI and BER performances of these 4D modulation formats are almost equivalent to those of probabilistic amplitude shaping with enumerative sphere shaping with a block length of 20.
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自动编码器为 5-7 比特/符号设计的几何形状四维调制格式
我们利用自动编码器设计了几何形状的四维(4D)调制格式,可用于 5-7 比特/4D 符号,这是深度学习应用之一,使用基于 2ary 振幅 8ary 相移键控的 4D 格式进行预训练。数值评估表明,所获得的 4D 调制格式在归一化广义互信息(NGMI)和误码率(BER)性能方面具有 0.5-0.7dB 的信噪比灵敏度增益。此外,我们还表明这些 4D 调制格式的归一化互信息(NGMI)和误码率(BER)性能几乎等同于块长度为 20 的枚举球形概率振幅整形。
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来源期刊
IEICE Communications Express
IEICE Communications Express ENGINEERING, ELECTRICAL & ELECTRONIC-
自引率
33.30%
发文量
114
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