空间调制系统低复杂度的天线选择算法

摘要

Spatial modulation (SM)is a special multi-antenna transmission technology,where the transmit antenna index is exploited to convey information except for modulation signals.In order to obtain transmit-diversity gains,antenna selection technology is introduced in SM systems to increase its demodulation performance.In antenna selection technology, Euclidean distance antenna selection (EDAS )is widely applied.However,its exhaust-search detection has extremely high complexity,which limits its application.Thus,exploiting the characteristics of modulation symbols and 2-D quantization,two low-complexity and optimal antenna selection algorithms are proposed.The simulation results show that the proposed algo-rithms reduce the computational complexity meanwhile achieving optimal performance.%空间调制（Spatial Modulation，SM）是一种特殊的多天线传输技术，利用发送天线索引和发送的符号共同传递信息。为了获得发送分集增益，人们将天线选择技术应用到SM系统中，提高SM系统解调性能。在天线选择技术中，最大-最小欧式距离（Euclidean Distance Antenna Selection，EDAS）准则应用较为广泛，但是它的全搜索求解方法复杂度高，限制了其应用。为此，本文利用空间调制系统和调制符号本身的特性，从2维量化解调的视角出发，给出了两种低复杂度的最优天线选择算法，并通过计算机仿真和复杂度分析，表明了该算法的有效性和最优性。