Paper Info
Title
Enhancing Physical Layer Security With Artificial Noise in Large-Scale NOMA Networks
Abstract
This paper investigates the secrecy outage performance for a large-scale downlink system with full-duplex (FD) non-orthogonal multiple access (NOMA) transmission aided by artificial noise (AN). In the system, legitimate users (LUs) are randomly distributed according to homogeneous Poisson point processes whereas a passive eavesdropper (Eve) is certainly located. We introduce a secure cooperative communication scheme, in which nearby NOMA users operating in FD mode act as jammers and generate AN to enhance the physical layer security (PLS) of the legitimate transmission. Closed-form expressions in terms of the secrecy outage probability (SOP) for a user pair are acquired. Following the mathematical results, secrecy diversity order analysis is further carried out for two scenarios, i.e., 1) fixed transmit signal-to-noise ratio (SNR) at the Eve, and 2) transmit SNR at the Eve being proportional to that of LUs. Closed-form expressions of asymptotic SOP for the two scenarios are also obtained. Monte Carlo simulations are performed to certify the veracity of the theoretic analysis and illustrate that the proposed scheme employing both AN and FD-NOMA is superior in the secrecy outage to the NOMA scheme without AN and the orthogonal multiple access scheme with AN. Furthermore, the SOP performance enhancement through proper secrecy rate target selection and power allocation optimization is also evidenced by the simulations.
Year
DOI
Venue
2021
10.1109/TVT.2021.3057661
IEEE Transactions on Vehicular Technology
Keywords
DocType
Volume
NOMA,Signal to noise ratio,Security,Communication system security,Closed-form solutions,Silicon carbide,Protocols
Journal
70
Issue
ISSN
Citations 
3
0018-9545
8
PageRank 
References 
Authors
0.48
0
5
Name
Order
Citations
PageRank
Caihong Gong1132.95
Xinwei Yue2344.56
Zhenyu Zhang3176.80
Xiyuan Wang411915.30
Xiaoming Dai510021.23