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 - Funding Information:
This work has been supported by the European Research Council (ERC) and by the Information and Communication Technologies (ICT) under the European Union’s Horizon 2020 Research and Innovation Programme (Grant Agreement Nos. 694630, 725731, and 871464).
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
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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 -