PMID- 36236541
OWN - NLM
STAT- MEDLINE
DCOM- 20221017
LR  - 20221019
IS  - 1424-8220 (Electronic)
IS  - 1424-8220 (Linking)
VI  - 22
IP  - 19
DP  - 2022 Sep 30
TI  - Threshold-Based User-Assisted Cooperative Relaying in Beamspace Massive MIMO NOMA 
      Systems.
LID - 10.3390/s22197445 [doi]
LID - 7445
AB  - The incorporation of user-assisted cooperative relaying into beamspace massive 
      multiple-input multiple-output (mMIMO) non-orthogonal multiple access (NOMA) 
      system can extend the coverage area and improve the spectral and energy 
      efficiency for millimeter wave (mmWave) communications when a dynamic cluster of 
      mobile user terminals (MUTs) is formed within a beam. We propose threshold-based 
      user-assisted cooperative relaying into a beamspace mMIMO NOMA system in a 
      downlink scenario. Specifically, the intermediate MUTs between the 
      next-generation base station (gNB) and the cell-edge MUT become relaying MUTs 
      after the successful decoding of the signal of the cell-edge MUT only when they 
      meet the predetermined signal-to-interference plus noise ratio (SINR) threshold. 
      A zero forcing (ZF) precoder and iterative power allocation are used to minimize 
      both inter- and intra-beam interferences to maximize the system sum rate. We then 
      evaluate the performance of this system in a delay-intolerant cell-edge MUT 
      scenario. Moreover, the outage probability of the cell-edge MUT of the proposed 
      scheme is investigated and an analytic expression is derived. Simulation results 
      confirm that the proposed threshold-based user-assisted cooperative relaying 
      beamspace mMIMO NOMA system outperforms the user-assisted cooperative relaying in 
      beamspace mMIMO NOMA, beamspace MIMO-NOMA, and beamspace MIMO orthogonal multiple 
      access (OMA) systems in terms of spectrum efficiency, energy efficiency, and 
      outage probability.
FAU - Alimo, David
AU  - Alimo D
AD  - Graduate School of Engineering, Kochi University of Technology, 185 Miyanokuchi, 
      Tosayamada, Kami City 782-8502, Japan.
FAU - Hamamura, Masanori
AU  - Hamamura M
AD  - Graduate School of Engineering, Kochi University of Technology, 185 Miyanokuchi, 
      Tosayamada, Kami City 782-8502, Japan.
AD  - School of Information, Kochi University of Technology, 185 Miyanokuchi, 
      Tosayamada, Kami City 782-8502, Japan.
FAU - Sabuj, Saifur Rahman
AU  - Sabuj SR
AUID- ORCID: 0000-0002-7634-6994
AD  - Department of Electronic Engineering, Hanabat National University, Daejeon 34158, 
      Korea.
AD  - Department of Electrical and Electronic Engineering, Brac University, Dhaka 1212, 
      Bangladesh.
LA  - eng
PT  - Journal Article
DEP - 20220930
PL  - Switzerland
TA  - Sensors (Basel)
JT  - Sensors (Basel, Switzerland)
JID - 101204366
SB  - IM
MH  - Communication
MH  - Computer Simulation
MH  - Humans
MH  - *Noma
PMC - PMC9571266
OTO - NOTNLM
OT  - beamspace
OT  - cooperative relaying
OT  - massive multiple-input multiple-output (mMIMO)
OT  - non-orthogonal multiple access (NOMA)
COIS- The authors declare no conflict of interest.
EDAT- 2022/10/15 06:00
MHDA- 2022/10/18 06:00
PMCR- 2022/09/30
CRDT- 2022/10/14 02:37
PHST- 2022/08/18 00:00 [received]
PHST- 2022/09/27 00:00 [revised]
PHST- 2022/09/28 00:00 [accepted]
PHST- 2022/10/14 02:37 [entrez]
PHST- 2022/10/15 06:00 [pubmed]
PHST- 2022/10/18 06:00 [medline]
PHST- 2022/09/30 00:00 [pmc-release]
AID - s22197445 [pii]
AID - sensors-22-07445 [pii]
AID - 10.3390/s22197445 [doi]
PST - epublish
SO  - Sensors (Basel). 2022 Sep 30;22(19):7445. doi: 10.3390/s22197445.