一种码片内多径参数的最大似然估计算法
doi: 10.3724/SP.J.1146.2012.00349
A Maximum Likelihood Estimation of Subchip Multipath Parameters
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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。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.
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