Spatially-Distributed RISs vs Relay-Assisted Systems: A Fair Comparison
This paper aims to make a comparison between decode-and-forward (DF) relays and reconfigurable intelligent surfaces (RISs) in the case where only one relay or RIS is selected based on the maximization of the signal-to-noise-ratio (SNR). Our study accounts for the spatial distribution of RISs and rel...
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doaj-ff152db46d83495bb7cb642650b582302021-04-14T23:00:45ZengIEEEIEEE Open Journal of the Communications Society2644-125X2021-01-01279981710.1109/OJCOMS.2021.30609299359653Spatially-Distributed RISs vs Relay-Assisted Systems: A Fair ComparisonJia Ye0https://orcid.org/0000-0002-7242-6065Abla Kammoun1https://orcid.org/0000-0002-0195-3159Mohamed-Slim Alouini2https://orcid.org/0000-0003-4827-1793Department of Electrical Engineering, Computer Electrical and Mathematical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal, Saudi ArabiaDepartment of Electrical Engineering, Computer Electrical and Mathematical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal, Saudi ArabiaDepartment of Electrical Engineering, Computer Electrical and Mathematical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal, Saudi ArabiaThis paper aims to make a comparison between decode-and-forward (DF) relays and reconfigurable intelligent surfaces (RISs) in the case where only one relay or RIS is selected based on the maximization of the signal-to-noise-ratio (SNR). Our study accounts for the spatial distribution of RISs and relays, which is assumed to follow a Poisson point process (PPP). It considers two different path loss models corresponding to RIS/relays randomly located in the near-field and the far-field of the transmitter. Based on the Gamma distribution moment matching method and tools from stochastic geometry, we derive approximations for the outage probability (OP) as well as the energy efficiency (EE) of the RISs-assisted system in the near-field and the far-field scenarios separately. Under the same conditions as RIS, the expressions for OP and EE of the half-duplex and the full-duplex DF relays-assisted systems are also derived. Simulation results are presented to corroborate the proposed analysis and compare between the three technologies. Our results show that RIS is the best choice in the near-field case, regardless of the OP or EE criterion. Compared to half-duplex relays and full-duplex relays, the RIS based system is the most energy-efficient solution to assist communication. Moreover, RIS allows for an improvement in both OP and EE when equipped with more reflecting elements or more densely deployed.https://ieeexplore.ieee.org/document/9359653/Decode-and-forward relaysenergy efficiencyfar-fieldnear-filedoutage probabilityreconfigurable intelligent surfaces |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jia Ye Abla Kammoun Mohamed-Slim Alouini |
spellingShingle |
Jia Ye Abla Kammoun Mohamed-Slim Alouini Spatially-Distributed RISs vs Relay-Assisted Systems: A Fair Comparison IEEE Open Journal of the Communications Society Decode-and-forward relays energy efficiency far-field near-filed outage probability reconfigurable intelligent surfaces |
author_facet |
Jia Ye Abla Kammoun Mohamed-Slim Alouini |
author_sort |
Jia Ye |
title |
Spatially-Distributed RISs vs Relay-Assisted Systems: A Fair Comparison |
title_short |
Spatially-Distributed RISs vs Relay-Assisted Systems: A Fair Comparison |
title_full |
Spatially-Distributed RISs vs Relay-Assisted Systems: A Fair Comparison |
title_fullStr |
Spatially-Distributed RISs vs Relay-Assisted Systems: A Fair Comparison |
title_full_unstemmed |
Spatially-Distributed RISs vs Relay-Assisted Systems: A Fair Comparison |
title_sort |
spatially-distributed riss vs relay-assisted systems: a fair comparison |
publisher |
IEEE |
series |
IEEE Open Journal of the Communications Society |
issn |
2644-125X |
publishDate |
2021-01-01 |
description |
This paper aims to make a comparison between decode-and-forward (DF) relays and reconfigurable intelligent surfaces (RISs) in the case where only one relay or RIS is selected based on the maximization of the signal-to-noise-ratio (SNR). Our study accounts for the spatial distribution of RISs and relays, which is assumed to follow a Poisson point process (PPP). It considers two different path loss models corresponding to RIS/relays randomly located in the near-field and the far-field of the transmitter. Based on the Gamma distribution moment matching method and tools from stochastic geometry, we derive approximations for the outage probability (OP) as well as the energy efficiency (EE) of the RISs-assisted system in the near-field and the far-field scenarios separately. Under the same conditions as RIS, the expressions for OP and EE of the half-duplex and the full-duplex DF relays-assisted systems are also derived. Simulation results are presented to corroborate the proposed analysis and compare between the three technologies. Our results show that RIS is the best choice in the near-field case, regardless of the OP or EE criterion. Compared to half-duplex relays and full-duplex relays, the RIS based system is the most energy-efficient solution to assist communication. Moreover, RIS allows for an improvement in both OP and EE when equipped with more reflecting elements or more densely deployed. |
topic |
Decode-and-forward relays energy efficiency far-field near-filed outage probability reconfigurable intelligent surfaces |
url |
https://ieeexplore.ieee.org/document/9359653/ |
work_keys_str_mv |
AT jiaye spatiallydistributedrissvsrelayassistedsystemsafaircomparison AT ablakammoun spatiallydistributedrissvsrelayassistedsystemsafaircomparison AT mohamedslimalouini spatiallydistributedrissvsrelayassistedsystemsafaircomparison |
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1721526985275998208 |