Four-dimensional trellis-coded modulation using sphere packing non-cubic constellations

Four-dimensional trellis-coded modulation using sphere packing non-cubic constellations
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使用球体封装非立方星座的四维网格编码调制

DOI:
10.1016/j.ijleo.2019.04.012
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发表时间:
2019-06
期刊:
影响因子:
3.1
通讯作者:
Yadong Sun
Yadong Sun
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Ye Zhang;Guijun Hu;Xueying Yang;Yadong Sun

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本文在一种新的集划分(SP)方法的基础上,提出了利用球面填充四维(4D)非立方星座的八态网格编码调制(TCM)方案。球体填充四维格式由于星座点的空间排列更加密集,具有较高的渐近功率效率。该方案可以进一步缓解四维调制格式下频谱效率(SE)与APE之间的矛盾。在充分考虑星座点之间的最小欧氏距离和最近邻数目的条件下,完成了四维非立方星座的SP过程。我们将这些4D TCM格式与800 km标准单模光纤(SSMF)传输系统中相应的4D格式(即dicyclic4_16、b4_32、b4_64、SP-QAM4_128和256-D4)进行了比较。通过误码率(BER)性能测量,在BER = 1 × 10−3时,编码增益分别为5.7 dB、3.8 dB、3.6 dB、3.9 dB和4.1 dB。
In the paper, we introduce the 8-state trellis-coded modulation (TCM) scheme using sphere packing four-dimensional (4D) non-cubic constellations on the basis of a novel set-partitioning (SP) method. Sphere packing four-dimensional formats have a higher asymptotic power efficiency (APE) because the spatial arrangement of constellation points is more dense. The scheme can further alleviate the contradiction between spectral efficiency (SE) and APE in 4D modulation format. The SP process of 4D non-cubic constellations is completed in the condition that the minimum Euclidean distance between the constellation points and the number of nearest neighbors are adequately considered. We compared these 4D TCM formats to their corresponding 4D formats (i.e., dicyclic4_16, b4_32, b4_64, SP-QAM4_128 and 256-D4) in the 800 km standard single-mode fiber (SSMF) transmission system. Through measurements of bit error rate (BER) performance, at the BER = 1 × 10−3, the coding gains are 5.7 dB, 3.8 dB, 3.6 dB, 3.9 dB and 4.1 dB respectively.
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