正交空间调制系统的低复杂度检测算法

A low complexity signal detector in quadrature spatial modulation system

正交空间调制(quadrature spatial modulation,QSM)作为一种扩展的空间调制(spatial modulation,SM)传输方案,近年来受到业界的广泛关注。它通过在发送端将发送的复值符号的实部和虚部分开传输来提高频谱效率。由于正交空间调制系统的最大似然(maximum likelihood,ML)检测算法在整个搜索空间进行穷搜索,导致计算复杂度极高。针对QSM系统接收端检测算法复杂度较高的问题,利用QSM系统信号固有的稀疏特性,提出了一种QSM系统的压缩感知(compressed sensing,CS)检测算法。仿真结果表明,新的检测算法在误码性能上接近ML检测算法,复杂度约为ML的4.7%。

QSM(quadrature spatial modulation)has been paid much attention recently to an extended spatial modulation transmission scheme which improves the spectral efficiency by independently transmitting the real and imaginary parts of a complex data symbol.ML(maximum likelihood)detector for QSM system has to exhaustively search in the whole search space,so the complexity of ML detector is very high.For the high complexity of QSM system detection,a low complexity detector based on the concept of CS(compressed sensing)is proposed by exploiting the fixed sparse property of quadrature spatial modulation system signals.The simulation results show that the novel detector exhibits near maximum likelihood detector bit error performance and its complexity is about4.7%of ML.