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在阵列天线接收系统中,最优空-时联合多用户检测器的运算复杂度与用户数量成指数关系而不实用。把极大似然空-时联合多用户检测问题转化为带约束的二次规划问题,并以QPSK信号为研究对象,将ε近似算法应用于空-时联合多用户检测中。ε近似算法计算复杂度与用户数成多项式关系,仿真表明,性能优于现有文献的算法。
In the array antenna receiving system, the computational complexity of the optimal space-time combined multi-user detector is exponential with the number of users and not practical. The problem of maximum likelihood space-time combined multi-user detection is transformed into quadratic programming problem with constraint. The QPSK signal is taken as the research object, and the ε approximation algorithm is applied to space-time combined multi-user detection. ε approximation algorithm calculates the complexity and the number of users into a polynomial relationship, the simulation shows that the performance is superior to the existing literature algorithm.