This snapshot total was divided into
78 blocks with 256 samples, and to each block a fast Fourier
transform (FFT) was applied to separate the target signal from
the measurement data. We used three AOA estimation
algorithms: 1) a beamformer method with a 20 dB Chebyshev
distribution, 2) a multiple signal classification (MUSIC), and 3)
MUSIC with spatial smoothing to the data, and obtained the
horizontal and vertical AOA estimations of the impinging
signals. As for details of the methods, refer to other research
papers, such as [4] and [5].