基于天线索引多种星座联合的空间索引调制

Space Index Modulation Based on Antenna Index and Multiple Constellation Combination

为进一步开发无线通信系统的天线索引域,提高无线通信的频谱利用率,提出了一种联合三维星座和正交幅度调制星座的增强广义空间调制新方案(EGSM-3DQ).在方案中,借助一个矢量索引比特,构建三维星座来拓展激活天线索引的组合.发射部分的矢量符号由两个空间矢量符号构成,其中一个空间矢量符号是通过三维星座信号映射器和天线索引矢量调制器,将三维信号符号的3个分量调制到2根或3根激活发射天线上而获得的;另一空间矢量符号是通过矢量选择器将1个或多个正交幅度调制符号调制在1根或多根激活天线上而获得的.通过仿真实验分析系统的平方最小欧式距离和平均比特错误概率,结果表明,与传统通信系统相比,新方案改善了通信的性能.

In order to further develop the antenna index domain of wireless communication system and improve the spectrum utilization of wireless communication,a new enhanced generalized space modulation scheme(EGSM-3DQ)combining three-dimensional constellation and orthogonal amplitude modulation constellation was proposed.In the scheme,with the help of a vector index bit,a three-dimensional constellation is constructed to expand the combination of active antenna indexes.The emission vector symbol is composed of two space vector symbols,one of which is obtained by modulating the three components of the three-dimensional signal symbol into two or three activated emission antennas through a three-dimensional constellation signal mapper and an antenna index vector modulator.Another spatial vector symbol is obtained by modulating one or more quadrature amplitude modulation symbols on one or more active antennas by means of a vector selector.Finally,the squared minimum Euclidean distance and the average bit error probability of the system are analyzed,and the simulation results show that the proposed scheme improves the communication performance compared with the traditional communication system.