One of the most common digital-signal-processing techniques is the discrete Fourier transform (DFT), which breaks a signal into its component frequencies and can be represented as a matrix.
最常见的数字信号处理技术之一是离散傅立叶变换（DFT），它把一个信号分解成它的组成频率，并表示成一个矩阵。
DFT is used to estimate the covariance matrix of downlink channel of the path, not calculating DOA.
在不求出DOA的情况下，采用离散傅里叶变换来估计该路径下行信道协方差矩阵。
DFT is used to estimate the covariance matrix of downlink channel of the path, not calculating DOA.
在不求出DOA的情况下，采用离散傅里叶变换来估计该路径下行信道协方差矩阵。
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