text: abstract—wireless backhaul communication has been recently
  realized with large antennas operating in the millimeter wave
  (mmwave) frequency band and implementing highly directional
  beamforming. in this paper, we focus on the alignment problem of
  narrow beams between fixed position network nodes in mmwave
  backhaul systems that are subject to small displacements due
  to wind flow or ground vibration. we consider nodes equipped
  with antenna arrays that are capable of performing only analog
  processing and communicate through wireless channels including
  a line-of-sight component. aiming at minimizing the time needed
  to achieve beam alignment, we present an efficient method that
  capitalizes on the exchange of position information between the
  nodes to design their beamforming and combining vectors. some
  numerical results on the outage probability with the proposed
  beam alignment method offer useful preliminary insights on the
  impact of some system and operation parameters.