Secrecy Outage Probability of a NOMA Scheme and Impact Imperfect Channel State Information in Underlay Cooperative Cognitive Networks

Security performance and the impact of imperfect channel state information (CSI) in underlay cooperative cognitive networks (UCCN) is investigated in this paper. In the proposed scheme, relay R uses non-orthogonal multiple access (NOMA) technology to transfer messages e 1 , e 2 from the source node S to User 1 (U1) and User 2 (U2), respectively. An eavesdropper (E) is also proposed to wiretap the messages of U1 and U2. The transmission’s security performance in the proposed system was analyzed and performed over Rayleigh fading channels. Through numerical analysis, the results showed that the proposed system’s secrecy performance became more efficient when the eavesdropper node E was farther away from the source node S and the intermediate cooperative relay R. The secrecy performance of U1 was also compared to the secrecy performance of U2. Finally, the simulation results matched the Monte Carlo simulations well.

Download Full-text

The impact of imperfect channel state information on the performances of relay selection schemes in underlay cognitive networks

2014 International Wireless Communications and Mobile Computing Conference (IWCMC) ◽

10.1109/iwcmc.2014.6906352 ◽

2014 ◽

Cited By ~ 1

Author(s):

Hela Chamkhia ◽

Aymen Omri ◽

Ridha Bouallegue

Keyword(s):

Channel State Information ◽

Relay Selection ◽

Cognitive Networks ◽

Imperfect Channel State Information ◽

Channel State ◽

State Information ◽

The Impact

Download Full-text

Performance Analysis of MEC Based on NOMA under Imperfect CSI with Eavesdropper

Wireless Communications and Mobile Computing ◽

10.1155/2021/2700843 ◽

2021 ◽

Vol 2021 ◽

pp. 1-10

Author(s):

Xuehua Li ◽

Yingjie Pei ◽

Huan Jiang ◽

Xinwei Yue ◽

Yafei Wang ◽

...

Keyword(s):

Energy Efficiency ◽

Channel State Information ◽

Multiple Access ◽

System Throughput ◽

Secrecy Outage Probability ◽

Imperfect Csi ◽

Channel State ◽

State Information ◽

Secrecy Outage ◽

The Impact

Mobile edge computing (MEC) is becoming more and more popular because of improving computing power in virtual reality, augmented reality, unmanned driving, and other fields. This paper investigates a nonorthogonal multiple access- (NOMA-) based MEC system, which is under imperfect channel state information (ipCSI). In this system model, a pair of users offloads their tasks to the MEC server with the existence of an eavesdropper (Eve). To evaluate the impact of Eve on the performance of the NOMA-MEC system, the secrecy outage probability (SOP) expressions for two users with the conditions of imperfect CSI and perfect channel state information (pCSI) are derived. In addition, both throughput and energy efficiency are discussed in the delay-limited transmission mode. Simulation results reveal that (1) due to the influence of channel estimation errors, the secrecy outage behaviors of two users under ipCSI conditions are worse than those of users with pCSI; (2) the secrecy performance of NOMA-MEC is superior to orthogonal multiple access- (OMA-) aided MEC systems; and (3) the NOMA-MEC systems have the ability to attain better system throughput and energy efficiency compared with OMA-MEC.

Download Full-text