Machine Learning-Based Beamforming Design for Millimeter Wave IRS Communications With Discrete Phase Shifters

Rate Loss of Hybrid Beamforming with Imperfect Phase Shifters in Millimeter Wave Systems

In millimeter massive MIMO systems, hybrid beamforming algorithms with fewer RF chain are widely applied as they can save power and cut down on hardware costs. Hybrid beamforming can be divided into two stages: analog beamforming in the RF domain usually implemented with phase shifters and digital beamforming in the baseband domain. Phase shifters have rms phase error and rms gain error which a...

Microwave And Millimeter-Wave Ferrite Phase Shifters

Low-loss Millimeter-wave Phase Shifters Based on Mechanical Reconfiguration

We propose different concepts of mechanically reconfigurable true-time-delay phase shifters using micro-actuators at millimeter-waves (MMW). The mechanical reconfiguration allows to achieve phase shift reconfiguration with very low losses. One of the proposed concepts has been fully implemented and tested, demonstrating state-of-the-art performance in terms of phase-shift/loss ratio.

Beamforming Based Full-Duplex for Millimeter-Wave Communication

In this paper, we study beamforming based full-duplex (FD) systems in millimeter-wave (mmWave) communications. A joint transmission and reception (Tx/Rx) beamforming problem is formulated to maximize the achievable rate by mitigating self-interference (SI). Since the optimal solution is difficult to find due to the non-convexity of the objective function, suboptimal schemes are proposed in this...

Millimeter-Wave Beamforming: Antenna Array Design Choices & Characterization

This white paper introduces some of the fundamental theory behind beamforming antennas. In addition to these basic concepts, calculation methods for radiation patterns and a number of simulations results, as well as some real world measurement results for small linear arrays are shown. Due to the bandwidths likely to be employed in such applications, a non-standard way of graphical representati...