Comparing antenna selection and hybrid precoding for millimeter wave wireless communications

摘要

Due to the small wavelengths at millimetre wave frequencies, antenna arrays with dozens of elements fit easily even in hand-held devices. As RF chains are power hungry and costly, all-digital approaches are impractical and analogue-digital co-designs are likely to come. Common for all approaches is a dimensional reduction of the large MIMO channel. This study compares Antenna Selection (AS) and Hybrid Precoding (HP). In HP systems, channels are estimated employing a set of hybrid codebooks exploiting all antennas. For AS we propose a bistatic MIMO radar method to estimate the channel even with a reduced number of antennas, identical to the number of RF chains.