一种新的22n1阶QAM星座图设计ANovel-电子与信息学报.PDF

第32 卷第6 期 电 子 与 信 息 学 报 Vol.32No.6 2010 年6 月 Journal of Electronics Information Technology Jun. 2010 一种新的22n+1 阶QAM 星座图设计 吴毅凌 李红滨 赵玉萍 (北京大学信息科学技术学院电子学系 北京 100871) 摘 要：该文研究了22n+1 阶正交幅度调制(Quadrature Amplitude Modulation，QAM)的星座图，提出了一种可 以根据格雷映射规则建立映射表的正方形QAM 星座图。为了对比正方形星座图与十字形以及矩形星座图的性能， 该文以32 QAM 为例对3 种星座图的信号功率效率进行了分析，并对三者的误码性能进行了仿真。仿真结果表明， 与信道编码结合使用时，正方形星座图的误码性能优于十字形星座图和矩形星座图。而且，对于多载波通信系统， 正方形星座图和十字形以及矩形星座图具有相同的信号功率效率。 关键词：正方形QAM 星座图；格雷映射规则；功率效率；编码增益 中图分类号：TN911.3 文献标识码： A 文章编号：1009-5896(2010)06-1510-05 DOI: 10.3724/SP.J.1146.2008.00865 A Novel Constellation Design for 22n+1-QAM Wu Yi-ling Li Hong-bin Zhao Yu-ping (Department of Electronics, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China) Abstract: This paper studies the constellations of 22n+1-Quadrature Amplitude Modulation (QAM), and proposed a square QAM constellation which can build its mapping list according to the Gray coding rules. To compare the square constellation with the cross constellation and the rectangle constellation, the signal power efficiency of these three constellations and their BER performance is simulated, taking 32QAM for example. The simulation results show that square constellation has better BER performance than the other two. Moreover, the signal power efficient of square constellation is as well as that of cross constellation and rectangle constellation to the multi-carrier communication systems. Key words: Square QAM constellation; Gray mapping rule; Power efficiency; Coding gain