Paper Info
Title
Achieving Ultrareliable and Low-Latency Communications in IoT by FD-SCMA
Abstract
To enable ultrareliable and low-latency communications (URLLCs) in the Internet of Things (IoT), a sparse-code multiple-access (SCMA)-enhanced full-duplex (FD) scheme (FD-SCMA) is proposed in this article. FD-SCMA can support short-packet transmissions of several SCMA users in the uplink (UL) and downlink (DL) simultaneously by an FD next generation node B (gNB). First, the gNB and UL users can generate and superpose signals according to the preconfigured SCMA codebooks, and simultaneously transmit the signals via occupied subcarriers in a joint SCMA pattern. The receivers at the gNB and DL users can demodulate and decode the signals with multiuser detection (MUD). With the imperfect self-interference suppression (SIS) of FD considered, the effective signal-to-noise ratio (SNR) of FD-SCMA at the gNB and DL users is formulated. The error probability of FD-SCMA in the UL and DL is also derived under a given transmission latency constraint of short-packet transmissions. In the stationary flat-fading channel, it is proved that FD-SCMA can achieve better reliability than the existing FD and SCMA schemes. In the time-invariant frequency-selective fading channel, the upper bounds for error probability of the UL and DL users in FD-SCMA are derived, respectively. Through the theoretical calculation and Monte Carlo simulation, it is verified that the superiority of FD-SCMA in supporting ultrareliable and low-latency short-packet transmissions in IoT.
Year
DOI
Venue
2020
10.1109/JIOT.2019.2948281
IEEE Internet of Things Journal
Keywords
DocType
Volume
Reliability,NOMA,Internet of Things,Multiuser detection,Error probability,Signal to noise ratio
Journal
7
Issue
ISSN
Citations 
1
2327-4662
0
PageRank 
References 
Authors
0.34
0
7
Name
Order
Citations
PageRank
Jie Zeng17926.46
Tiejun Lv266997.19
Zhipeng Lin34213.17
Ren Ping Liu449862.73
Jiajia Mei500.34
Wei Ni647470.16
Y. Jay Guo79011.12