实际无线环境中，多径分量数目与幅度都是时变的，则传统信道估计方法不再适用。

However, in the practical wireless environment, the number of channel taps and amplitude are all unknown and time-varying in whole process, thus typical estimation methods are not suitable.

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这里存在着数目无穷的谐频分量。

There is an infinite number of harmonic-frequency components.

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但如果GMM模型的高斯混合分量的数目比较多时，整个模型运算的复杂度会比较大。

However, if it has a large number of Gaussians in GMM, it leads to a large complexity of computation.

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