6 papers
Wideband dynamic metasurface antenna performance with practical design characteristics
Joseph M. Carlson, Nitish V. Deshpande, Miguel Rodrigo Castellanos +1
Dynamic metasurface antennas (DMA) provide low-power beamforming through reconfigurable radiative slots. Each slot has a tunable component that consumes low power compared to typic…
Joint Band Assignment and Beam Management using Hierarchical Reinforcement Learning for Multi-Band Communication
Dohyun Kim, Miguel R. Castellanos, Robert W. Heath
Multi-band operation in wireless networks can improve data rates by leveraging the benefits of propagation in different frequency ranges. Distinctive beam management procedures in…
Hierarchical Codebook Design with Dynamic Metasurface Antennas for Energy-Efficient Arrays
Joseph Carlson, Miguel R. Castellanos, Robert W. Heath
Dynamic metasurface antennas (DMA) provide a solution to form compact, cost-effective, energy-efficient multiple-input-multiple output (MIMO) arrays. In this paper, we implement a…
Joint Relay Selection and Beam Management Based on Deep Reinforcement Learning for Millimeter Wave Vehicular Communication
Dohyun Kim, Miguel R. Castellanos, Robert W. Heath
Cooperative relays improve reliability and coverage in wireless networks by providing multiple paths for data transmission. Relaying will play an essential role in vehicular networ…
A wideband generalization of the near-field region for extremely large phased-arrays
Nitish Deshpande, Miguel R. Castellanos, Saeed R. Khosravirad +3
The narrowband and far-field assumption in conventional wireless system design leads to a mismatch with the optimal beamforming required for wideband and near-field systems. This d…
Channel Reconstruction-Based Hybrid Precoding for Millimeter Wave Multi-User MIMO Systems
Miguel R. Castellanos, Vasanthan Raghavan, Jung H. Ryu +4
The focus of this paper is on multi-user MIMO transmissions for millimeter wave systems with a hybrid precoding architecture at the base-station. To enable multi-user transmissions…