TY - GEN
T1 - Beyond Max-SNR
T2 - 2020 IEEE International Symposium on Information Theory, ISIT 2020
AU - Karasik, Roy
AU - Simeone, Osvaldo
AU - Di Renzo, Marco
AU - Shamai Shitz, Shlomo
N1 - Publisher Copyright:
© 2020 IEEE.
PY - 2020/6
Y1 - 2020/6
N2 - A communication link aided by a Reconfigurable Intelligent Surface (RIS) is studied, in which the transmitter can control the state of the RIS via a finite-rate control link. Prior work mostly assumed a fixed RIS configuration irrespective of the transmitted information. In contrast, this work derives information-theoretic limits, and demonstrates that the capacity is achieved by a scheme that jointly encodes information in the transmitted signal as well as in the RIS configuration. In addition, a novel signaling strategy based on layered encoding is proposed that enables practical successive cancellation-type decoding at the receiver. Numerical experiments demonstrate that the standard max-SNR scheme that fixes the configuration of the RIS as to maximize the Signal-to-Noise Ratio (SNR) at the receiver is strictly suboptimal, and is outperformed by the proposed strategies at all practical SNR levels.
AB - A communication link aided by a Reconfigurable Intelligent Surface (RIS) is studied, in which the transmitter can control the state of the RIS via a finite-rate control link. Prior work mostly assumed a fixed RIS configuration irrespective of the transmitted information. In contrast, this work derives information-theoretic limits, and demonstrates that the capacity is achieved by a scheme that jointly encodes information in the transmitted signal as well as in the RIS configuration. In addition, a novel signaling strategy based on layered encoding is proposed that enables practical successive cancellation-type decoding at the receiver. Numerical experiments demonstrate that the standard max-SNR scheme that fixes the configuration of the RIS as to maximize the Signal-to-Noise Ratio (SNR) at the receiver is strictly suboptimal, and is outperformed by the proposed strategies at all practical SNR levels.
UR - http://www.scopus.com/inward/record.url?scp=85090403829&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85090403829&partnerID=8YFLogxK
U2 - 10.1109/ISIT44484.2020.9174060
DO - 10.1109/ISIT44484.2020.9174060
M3 - Conference contribution
AN - SCOPUS:85090403829
T3 - IEEE International Symposium on Information Theory - Proceedings
SP - 2965
EP - 2970
BT - 2020 IEEE International Symposium on Information Theory, ISIT 2020 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
Y2 - 21 July 2020 through 26 July 2020
ER -