TY - JOUR
T1 - Secure Transmission in a NOMA-Assisted IoT Network with Diversified Communication Requirements
AU - Xiang, Zhongwu
AU - Yang, Weiwei
AU - Cai, Yueming
AU - Xiong, Jun
AU - Ding, Zhiguo
AU - Song, Yi
N1 - Funding Information:
Manuscript received April 4, 2020; accepted May 15, 2020. Date of publication May 19, 2020; date of current version November 12, 2020. This work was supported in part by the National Natural Science Foundation of China under Grant 61771487, and in part by the National Key Research and Development Program of China under Grant 2018YFB1801103. (Corresponding author: Weiwei Yang.) Zhongwu Xiang, Weiwei Yang, and Yueming Cai are with the College of Communication Engineering, Army Engineering University of PLA, Nanjing 210007, China (e-mail: [email protected]; [email protected]; [email protected]).
Publisher Copyright:
© 2014 IEEE.
PY - 2020/11
Y1 - 2020/11
N2 - Considering the diversified communication requirements in the Internet-of-Things (IoT) networks, this article proposes a nonorthogonal multiple access (NOMA) scheme which pairs two types of typical users, i.e., delay-sensitive user (DSU) and security-required user (SRU) to share the same nonorthogonal communication resources. We focus on the investigation of the secure transmission for the SRU while guaranteeing the communication requirements of the DSUs at the high priority. Specifically, the delay requirement of the DSUs and the security demand of the SRU are guaranteed by using short-packet communications and the maximal ratio transmission (MRT) scheme, respectively. Since the packets cannot always be detected correctly in the short-packet communications, a novel power allocation strategy is designed sophisticatedly to avoid the outage performance floor at the SRU caused by the short-packet communications. A set of closed-form expressions of the connection outage probability (COP), secrecy outage probability, and effective secrecy throughput (EST) of the SRU are derived over Nakagami- m channels in the proposed NOMA scheme and also the benchmark OMA scheme. Besides, we provide the security-reliability tradeoff (SRT) and security-efficiency tradeoff (SET) results for obtaining more insights into system performance. Results demonstrate the superiority of the proposed NOMA scheme over the benchmark OMA scheme in terms of the COP, EST, SRT, and SET when the transmitter is equipped with multiple antennas.
AB - Considering the diversified communication requirements in the Internet-of-Things (IoT) networks, this article proposes a nonorthogonal multiple access (NOMA) scheme which pairs two types of typical users, i.e., delay-sensitive user (DSU) and security-required user (SRU) to share the same nonorthogonal communication resources. We focus on the investigation of the secure transmission for the SRU while guaranteeing the communication requirements of the DSUs at the high priority. Specifically, the delay requirement of the DSUs and the security demand of the SRU are guaranteed by using short-packet communications and the maximal ratio transmission (MRT) scheme, respectively. Since the packets cannot always be detected correctly in the short-packet communications, a novel power allocation strategy is designed sophisticatedly to avoid the outage performance floor at the SRU caused by the short-packet communications. A set of closed-form expressions of the connection outage probability (COP), secrecy outage probability, and effective secrecy throughput (EST) of the SRU are derived over Nakagami- m channels in the proposed NOMA scheme and also the benchmark OMA scheme. Besides, we provide the security-reliability tradeoff (SRT) and security-efficiency tradeoff (SET) results for obtaining more insights into system performance. Results demonstrate the superiority of the proposed NOMA scheme over the benchmark OMA scheme in terms of the COP, EST, SRT, and SET when the transmitter is equipped with multiple antennas.
KW - Nonorthogonal multiple access (NOMA)
KW - physical layer security (PLS)
KW - short-packet communications
UR - http://www.scopus.com/inward/record.url?scp=85090781943&partnerID=8YFLogxK
U2 - 10.1109/JIOT.2020.2995609
DO - 10.1109/JIOT.2020.2995609
M3 - Article
AN - SCOPUS:85090781943
SN - 2327-4662
VL - 7
SP - 11157
EP - 11169
JO - IEEE Internet of Things Journal
JF - IEEE Internet of Things Journal
IS - 11
M1 - 9096300
ER -