【摘要】 针对码分多址卫星移动通信中码片内两径参数估计问题,该文提出了基于最大似然的2维搜索算法。算法对两径时延进行2维搜索,同时对多径复振幅分别采用解相关和线性最小均方误差(LMMSE)算法进行估计,最后通过使似然函数最大化而找出最优的一组时延、复振幅估计值。仿真证明两径时延2维搜索结合采用近似的LMMSE算法进行多径复振幅估计具有良好的性能。更多还原

【Abstract】 To solve the estimation problem of multipath channel parameters in CDMA mobile satellite communications,a two-dimensional searching algorithm based on maximum likelihood estimation is proposed.The proposed algorithm searches for delays of two paths.Meanwhile,the magnitude of multipath is estimated using de-correlation or Linear Minimum Mean Square Error(LMMSE) algorithm.The optimal delay and amplitude estimation is finally found by maximizing the likelihood function.Simulation results show that the proposed algorithm,which combines a two-dimensional searching with approximate LMMSE estimation of multipath magnitude,performs well.更多还原