An Efficient Analog Eigen-Beamforming Procedure for Wideband mmWave MIMO-OFDM Systems

Millimeter wave communication systems define a new paradigm for wireless communications. At such high frequencies, multi-input multi-output (MIMO) processing is done on the radio-frequency signals to limit the hardware complexity and the energy consumption. Consequently, the channel experienced by the receiver directly depends on the transmitter and receiver antenna array responses, making the determination of the analog precoder and combiner an intertwined problem. In this paper, we propose a procedure capable of calculating analog weights at the transmitter and at the receiver, which allows the maximization of the wideband spectral efficiency for single stream transmission single user MIMO (SU-MIMO). While solely relying on partial channel state information (CSI), our procedure has close performance to full CSI-dependent schemes.