空间调制系统的星座优化设计

Optimal design for the constellation of spatial modulation systems

作为一种新颖的多天线技术,空间调制(spatial modulation,SM)受到了学者的关注。近年来,SM系统的星座设计成为研究热点。然而现有的星座设计算法由于预先设定星座结构,导致不能得到最优的星座图。对此,在发送功率受限的条件下提出一种新的星座设计方案。该方案基于最小化SM系统误符号率(symbol error rate,SER)准则,通过扩大可行域范围并利用遗传算法,对SM系统的信号星座进行了优化。此外,深入分析了信号星座对SER及系统参数对星座设计的影响。仿真结果表明,该算法得到的星座图相比于其他星座图具有更好的SER性能。

Spatial modulation (SM) has attracted great attention of scholars as a novel multiple antenna technology. The optimal design for the constellation has been studied in recent years. However, since the structure of constellation diagram is predesigned, the existing algorithms are incapable of finding the optimal constellation diagram. For this reason, a new constellation design method is proposed under power constraint. The proposed method based on the minimized systems symbol error rate (SER) optimizes the constellation by expanding the feasible domain and by using the genetic algorithm . Furthermore, the influences of signal constellations on SER and of system parameters on the process of constellation design are analyzed. The simulation results indicate that constellations obtained by the proposed method are capable of offering a better SER performance compared with other constellations.