ESL Student Seminar Series: Beamforming Techniques for Frequency-Selective and Millimeter Wave Indoor Broadcast Channels

Abstract

Most of the current linear processing (beamforming) techniques for wireless communications are designed for narrowband channels with a flat frequency response. However, frequency-selective channels are found in most practical applications due to complex radiowave propagation conditions. In the first part of this presentation, we introduce new beamformers designed specifically for frequency-selective channels based on: i) the electromagnetic time-reversal effect, and ii) the generalization of narrowband techniques. In the second part of the presentation, we present a novel algorithm for millimeter-wave frequency-selective channels that account for hardware constraints and realistic antenna array effects such as beam squint, antenna coupling, and individual element radiation patterns. We provide numerical evaluations of the beamformers with both statistical and ray-tracing channel models. Results show that the proposed solutions enable multi-Gbps connectivity to multiple users in real-life scenarios with much simpler hardware than current solutions.

Bio

Carlos Viteri received the B.S. degree in electronics and telecommunications engineering from the Universidad del Cauca, Colombia, and the M.S. degree in electronics and computer engineering from the Universidad de Los Andes, Colombia. He was a Fulbright Fellow at The Ohio State University (2013–2016), where he’s currently pursuing the Ph.D. degree in electrical and computer engineering under Prof. Fernando Teixeira supervision. His research focuses on physical layer aspects of wireless communications.