APSK Constellation with Gray Mapping
APSK Constellation with Gray Mapping
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DOI：
10.1109/lcomm.2011.101211.111825
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发表时间：
2011-10
期刊：
影响因子：
--
通讯作者：
Zaishuang Liu;Qiuliang Xie;Kewu Peng;Zhixing Yang
中科院分区：
文献类型：
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作者：
Zaishuang Liu;Qiuliang Xie;Kewu Peng;Zhixing Yang
从互信息的角度来看，幅度相移键控 (APSK) 星座优于正交幅度调制 (QAM) 星座。然而，由于缺乏灰度映射，它引入了较高的独立解映射损失。在这封信中，提出了一种特殊的具有格雷映射的APSK星座（Gray-APSK），与具有格雷映射的QAM星座（Gray-QAM）相比，在独立和迭代解映射场景中，它提供了相当大的整形增益，并通过平均互信息分析和误码率模拟进行了验证。
Amplitude phase shift keying (APSK) constellation is superior to its quadrature amplitude modulation (QAM) counterpart from the mutual information point of view. However, due to the lack of Gray mapping, it introduces high independent demapping loss. In this letter, a special kind of APSK constellations with Gray mapping (Gray-APSK) is proposed, which provides considerable shaping gain compared with the QAM constellations with Gray mapping (Gray-QAM) in both independent and iterative demapping scenarios, as verified by average mutual information analysis and bit error rate simulations.