Paper Info
Title
SPATIAL EQUALIZATION BEFORE RECEPTION: RECONFIGURABLE INTELLIGENT SURFACES FOR MULTI-PATH MITIGATION
Abstract
Reconfigurable intelligent surfaces (RISs), which enable tunable anomalous reflection, have appeared as a promising method to enhance wireless systems. In this paper, we propose to use an RIS as a spatial equalizer to address the well-known multi-path fading phenomenon. By introducing some controllable paths artificially against the multi-path fading through the RIS, we can perform equalization during the transmission process instead of at the receiver, and thus all the users can share the same equalizer. Unlike the beamforming application of the RIS, which aims to maximize the received energy at receivers, the objective of the equalization application is to reduce the inter-symbol interference (ISI), which makes phase shifts at the RIS different. To this end, we formulate the phase shift optimization problem and propose an iterative algorithm to solve it. Simulation results show that the multi-path fading effect can be eliminated effectively compared to benchmark schemes.
Year
DOI
Venue
2021
10.1109/ICASSP39728.2021.9414612
2021 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING (ICASSP 2021)
Keywords
DocType
Citations 
Reconfigurable intelligent surfaces, spatial equalization, phase shift design
Conference
0
PageRank 
References 
Authors
0.34
0
4
Name
Order
Citations
PageRank
Hongliang Zhang157747.71
Lingyang Song23674238.94
Zhu Han311215760.71
H. V. Poor4254111951.66