多径衰落信道估计是移动通信系统在实际环境中为了提高接收机性能而迫切需要解决的问题。Nakagami⁃m参数估计方法主要有盲估计和基于导频信号的信道参数估计方法，重点研究了基于最大似然的Nakagami⁃m参数盲估计方法，该方法充分利用了最大似然估计是一种最优选择原理，当其概率密度函数取最大值时，可以把 m 的期望值作为其参数估计值，由此无需导频信号而直接估计出系统的信道系数。理论分析和仿真试验均证明了该方法在噪声环境下的可行性和适用性。%Multipath fading channel estimate is a problem,which needs to be solved as soon as possible,for the mobile communica⁃tion system for the sake of enhancing receiver performance in practical environment. Nakagami⁃m parameter estimate methods mainly comprise blind estimate and channel parameter estimate based on pilots. This thesis focuses on the research of Nakagami⁃m parameter blind estimate method on the basis of maximum likelihood.This method takes full advantage of the maximum likelihood estimation as an optimal choice principle.When probability density function takes the maximum value,the expected value of m can be used as its param⁃eter estimated value. Therefore the channel parameter of the system can be directly estimated without pilot signal. The feasibility and applicability of this method in noise circumstances have been proved by both theoretical analysis and simulation test.
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