5 papers
Uplink Channel Estimation for Multi-User MISO Systems Assisted by a Fluid Reconfigurable Intelligent Surface
Amarilton L. Magalhães, André L. F. de Almeida, George C. Alexandropoulos
Fluid reconfigurable intelligent surfaces (FRISs) have recently emerged as a promising paradigm for wireless communications, wherein the reflecting elements can dynamically select…
Channel Estimation for Downlink Communications Based on Dynamic Metasurface Antennas
Amarilton L. Magalhães, Fazal E-Asim, André L. F. de Almeida +1
Dynamic metasurface antennas (DMAs) are emerging as a promising technology to enable energy-efficient, large array-based multi-antenna systems. This paper presents a simple channel…
Reducing Complexity of Data-Aided Channel Estimation in RIS-Assisted Communications
Amarilton Lopes Magalhães, André Lima Férrer de Almeida, Gilderlan Tavares de Araújo
We consider the data-aided channel estimation (CE) problem in a reconfigurable intelligent surface (RIS)-assisted wireless communication system, where the channel and information s…
Joint Downlink-Uplink Channel Estimation for Non-Reciprocal RIS-Assisted Communications
Paulo R. B. Gomes, Amarilton L. Magalhães, André L. F. de Almeida
Reconfigurable intelligent surface (RIS) is a recent low-cost and energy-efficient technology with potential applicability for future wireless communications. Performance gains ach…
Semi-Blind Receivers for Hybrid Reflecting and Sensing RIS
Amarilton L. Magalhães, André L. F. de Almeida
Recent research has delved into advanced designs for reconfigurable intelligent surfaces (RIS) with integrated sensing functions. One promising concept is the hybrid RIS (HRIS), wh…