一种新的空间调制QPSK信号检测算法

摘要

Spatial modulation (SM ) is a novel multi-antenna transmission scheme which jointly uses active antenna indices and conventional signal set to convey information . Since the maximum likelihood (ML) optimal detection algorithm for SM systems needs to detect both the active antenna index and the transmitted signal ,the detection complexity is very high .To solve this problem ,based on the global optimal conditions of a binary quadratic programming a novel optimal ML simplified algorithm for SM QPSK signal is proposed . On the premise of having the same ML-optimal performance with the conventional ML-detector , the computational complexity of the proposed detector has been significantly reduced , especially in large antennas SM system . Finally , the simulation results are presented to show the M L-optimal performance of the proposed detector .%空间调制(SM )是一种新颖的多天线传输方案 ,它将激活天线序号与传统的信号调制相结合 ,共同承载发送信息.由于SM系统的最大似然(ML)最优检测算法既需要检测出激活天线序号又需要检测出发送的信息符号 ,检测复杂度很高.为此 ,利用二进制二次规划的全局最优条件 ,针对空间调制QPSK信号 ,提出了一种新的最优的ML简化检测算法.新算法在保证了传统ML最优检测性能的前提下 ,明显降低了算法的复杂度 ,特别在大天线空间调制系统中具有更加明显的优势.最后通过计算机仿真 ,验证了新算法的ML最优性.