Rate-Maximizing Zero-Forcing Hybrid Precoder for MU-MISO-OFDM

Hybrid precoders, consisting of an analog hardware-constrained part operating at radio frequency (RF) and a digital baseband, reduce the RF implementation complexity power consumption multi-antenna transceivers, expense some rate loss compared to all-digital precoder. The parts hybrid precoder are commonly designed by performing constrained matrix decomposition (MD) precoder, which aims minimize Euclidean distance between matrices corresponding In contrast, in this contribution we determine zero-forcing (ZF) that directly maximizes weighted sumrate MU-MISO-OFDM communication system, taking into account various hardware constraints on part. resulting maximum serves as useful benchmark for comparison with other ZF precoders. multi-carrier massive MIMO scenario, rate-maximizing precoders show considerable performance advantage over MD-type indicating latter far from optimum. This also investigates trade-off computational complexity. Because iterative nature their superior comes large When cannot be afforded, one should revert penalty; among non-iterative ones have only slightly worse but significantly smaller complexity, ones.