基于Anti-Gray映射的4D-QPSK星座设计  

4D- QPSK Constellation Design based on Anti- Gray Mapping

作　　者：郭常盈[1] 梁云英[2] 方伟伟[1] 

机构地区：[1]南阳理工学院,河南南阳473004 [2]中广电广播电影电视设计研究院,北京100045

出　　处：《通信技术》2015年第7期776-779,共4页Communications Technology

基　　金：河南省科技厅科技攻关计划项目(No.142102210552;No.132102210572)~~

摘　　要：多维映射通过增加星座的维度数而使得符号间的平均欧式距离大大增加,这可以大程度地提高数字通信系统的可靠性。然而已有的基于Gray映射的4D-QPSK星座在设计上,并没有充分利用四维星座的空间优势,对于相邻星座点的汉明距离并未达到最大。提出一种基于Anti-Gray映射的4D-QPSK星座设计方案,该方案中的比特映射方式按照相邻星座点汉明距离最大,汉明距离为1的星座点欧式距离最大的设计原则,使星座点间具有最大的分集度。仿真结果表明,该方案可以提高抵抗衰落信道的能力。By adding the number of constellation dimension, the average Euclidean distance of between the symbols could be greatly increased, and the reliability of digital communication system also be significantly improved. However, the existing design of 4D-QPSK constellation based on Gray mapping, make no use of the four-dimensional space, and thus could not reach the maximum Hamming distance to the adjacent con- stellation points. A design scheme of 4D-QPSK constellation based on Anti-Gray mapping is proposed, and in this scheme the bit mapping method is designed in accordance with the maximum Hamming distance to ad- jacent constellation points. The constellation points with Hamming distance of 1 enjoys the maximal Euclide- an distance, thus to reach the maximum diversity of between the constellation points. Simulation results show that the proposed scheme could enhance the capability of communication system to resist fading channel.

关 键 词：GRAY映射 Anti-Gray映射 多维映射 4D-QPSK 

分 类 号：TN914.3[电子电信—通信与信息系统]