TY - GEN
T1 - Spatial equalization before reception
T2 - 2021 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2021
AU - Zhang, Hongliang
AU - Song, Lingyang
AU - Han, Zhu
AU - Poor, H. Vincent
N1 - Publisher Copyright:
©2021 IEEE
PY - 2021
Y1 - 2021
N2 - 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.
AB - 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.
KW - Phase shift design
KW - Reconfigurable intelligent surfaces
KW - Spatial equalization
UR - https://www.scopus.com/pages/publications/85107314589
UR - https://www.scopus.com/inward/citedby.url?scp=85107314589&partnerID=8YFLogxK
U2 - 10.1109/ICASSP39728.2021.9414612
DO - 10.1109/ICASSP39728.2021.9414612
M3 - Conference contribution
AN - SCOPUS:85107314589
T3 - ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
SP - 8062
EP - 8066
BT - 2021 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2021 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
Y2 - 6 June 2021 through 11 June 2021
ER -