Journal
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
Volume 20, Issue 1, Pages 421-439Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TWC.2020.3024887
Keywords
Path loss; reconfigurable intelligent surface; metasurface; intelligent reflecting surface; large intelligent surface; wireless propagation measurements
Funding
- National Key Research and Development Program of China [2018YFA0701602, 2018YFA0701904, 2017YFA0700201, 2017YFA0700202, 2017YFA0700203]
- National Science Foundation of China (NSFC) [61625106]
- NSFC [61941104, 61722106, 61731010]
- European Commission through the H2020 ARIADNE Project [675806]
- Research Fund of National Mobile Communications Research Laboratory, Southeast University [2020B06]
- Fundamental Research Funds for the Central Universities [3204002004A2]
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This article develops free-space path loss models for RIS-assisted wireless communications in different scenarios by studying the physics and electromagnetic nature of RISs, validated through extensive simulation results and experimental measurements. The models reveal the relationships between the path loss and various factors, paving the way for further theoretical studies and practical applications in the field.
Reconfigurable intelligent surfaces (RISs) comprised of tunable unit cells have recently drawn significant attention due to their superior capability in manipulating electromagnetic waves. In particular, RIS-assisted wireless communications have the great potential to achieve significant performance improvement and coverage enhancement in a cost-effective and energy-efficient manner, by properly programming the reflection coefficients of the unit cells of RISs. In this article, free-space path loss models for RIS-assisted wireless communications are developed for different scenarios by studying the physics and electromagnetic nature of RISs. The proposed models, which are first validated through extensive simulation results, reveal the relationships between the free-space path loss of RIS-assisted wireless communications and the distances from the transmitter/receiver to the RIS, the size of the RIS, the near-field/far-field effects of the RIS, and the radiation patterns of antennas and unit cells. In addition, three fabricated RISs (metasurfaces) are utilized to further corroborate the theoretical findings through experimental measurements conducted in a microwave anechoic chamber. The measurement results match well with the modeling results, thus validating the proposed free-space path loss models for RISs, which may pave the way for further theoretical studies and practical applications in this field.
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