Low-Complexity Downlink Channel Estimation in mmWave Multiple-Input Single-Output Systems

This letter tackles the problem of channel estimation in mmWave multiple-input single-output systems, where users are equipped with single-antenna receivers. By leveraging broadcast transmissions downlink channel, two novel low-complexity approaches devised, able to operate even presence a reduced number transmit antennas or limited bandwidth. Numerical results show that proposed algorithms provide accurate estimates parameters, achieving at same time about 50% complexity reduction compared existing approaches.