PMID- 33669520
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20210311
LR  - 20210311
IS  - 1424-8220 (Electronic)
IS  - 1424-8220 (Linking)
VI  - 21
IP  - 4
DP  - 2021 Feb 19
TI  - Physical-Layer Security Improvement with Reconfigurable Intelligent Surfaces for 
      6G Wireless Communication Systems.
LID - 10.3390/s21041439 [doi]
LID - 1439
AB  - Recently, reconfigurable intelligent surfaces (RISs) have received much interest 
      from both academia and industry due to their flexibility and cost-effectiveness 
      in adjusting the phase and amplitude of wireless signals with low-cost passive 
      reflecting elements. In particular, many RIS-aided techniques have been proposed 
      to improve both data rate and energy efficiency for 6G wireless communication 
      systems. In this paper, we propose a novel RIS-based channel randomization (RCR) 
      technique for improving physical-layer security (PLS) for a time-division duplex 
      (TDD) downlink cellular wire-tap network which consists of a single base station 
      (BS) with multiple antennas, multiple legitimate pieces of user equipment (UE), 
      multiple eavesdroppers (EVEs), and multiple RISs. We assume that only a 
      line-of-sight (LOS) channel exists among the BS, the RISs, and the UE due to 
      propagation characteristics of tera-hertz (THz) spectrum bands that may be used 
      in 6G wireless communication systems. In the proposed technique, each RIS first 
      pseudo-randomly generates multiple reflection matrices and utilizes them for both 
      pilot signal duration (PSD) in uplink and data transmission duration (DTD) in 
      downlink. Then, the BS estimates wireless channels of UE with reflection matrices 
      of all RISs and selects the UE that has the best secrecy rate for each reflection 
      matrix generated. It is shown herein that the proposed technique outperforms the 
      conventional techniques in terms of achievable secrecy rates.
FAU - Youn, Janghyuk
AU  - Youn J
AUID- ORCID: 0000-0002-7486-8270
AD  - Department of Electronics Engineering, Chungnam National University, Daejeon 
      34134, Korea.
FAU - Son, Woong
AU  - Son W
AUID- ORCID: 0000-0001-9332-2102
AD  - Department of Electronics Engineering, Chungnam National University, Daejeon 
      34134, Korea.
FAU - Jung, Bang Chul
AU  - Jung BC
AUID- ORCID: 0000-0002-4485-9592
AD  - Department of Electronics Engineering, Chungnam National University, Daejeon 
      34134, Korea.
LA  - eng
PT  - Journal Article
DEP - 20210219
PL  - Switzerland
TA  - Sensors (Basel)
JT  - Sensors (Basel, Switzerland)
JID - 101204366
SB  - IM
PMC - PMC7922280
OTO - NOTNLM
OT  - 6G wireless communication system
OT  - intelligent reflecting surface
OT  - passive eavesdropper
OT  - physical-layer security
OT  - reconfigurable intelligent surface
OT  - secure communication
OT  - tera-hertz spectrum
COIS- The authors declare no conflict of interest.
EDAT- 2021/03/07 06:00
MHDA- 2021/03/07 06:01
PMCR- 2021/02/19
CRDT- 2021/03/06 01:05
PHST- 2021/01/22 00:00 [received]
PHST- 2021/02/14 00:00 [revised]
PHST- 2021/02/17 00:00 [accepted]
PHST- 2021/03/06 01:05 [entrez]
PHST- 2021/03/07 06:00 [pubmed]
PHST- 2021/03/07 06:01 [medline]
PHST- 2021/02/19 00:00 [pmc-release]
AID - s21041439 [pii]
AID - sensors-21-01439 [pii]
AID - 10.3390/s21041439 [doi]
PST - epublish
SO  - Sensors (Basel). 2021 Feb 19;21(4):1439. doi: 10.3390/s21041439.