Fig. 1From: mm-Wave channel estimation with accelerated gradient descent algorithmsULA receiver. Single path received by ULA with Nr=3 antennas at distance D from the source. In this case \(\eta _{1}^{1} = \frac {\delta }{\lambda } \cos \vartheta \) and \(\alpha _{1} = \frac {1}{D^{2}} e^{-j2\pi \frac {D}{\lambda }}\)Back to article page