  This work considers millimeter-wave channel estimation in a setting where
parameters of the underlying mmWave channels are varying dynamically over time
and there is a single drifting path. In this setting, channel estimates at time
block $k$ can be used as side information (SI) when estimating the channel at
block $k+1$. To estimate channel parameters, we employ an SI-aided (complex)
approximate message passing algorithm and compare its performance to a
benchmark based on orthogonal matching pursuit.
