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Outage performance in secure cooperative NOMA
, Article 2019 Iran Workshop on Communication and Information Theory, IWCIT 2019, 24 April 2019 through 25 April 2019 ; 2019 ; 9781728105840 (ISBN) ; Mirmohseni, M ; Aref, M. R ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2019
Abstract
Enabling cooperation in a NOMA system is a promising approach to improve its performance. In this paper, we study the cooperation in a secure NOMA system, where the legitimate users are distributed uniformly in the network and the eavesdroppers are distributed according to a homogeneous Poisson point process. We consider a cooperative NOMA scheme (two users are paired as strong and weak users) in two phases: 1) Direct transmission phase, in which the base station broadcasts a superposition of the messages, 2) Cooperation phase, in which the strong user acts as a relay to help in forwarding the messages of the weak user. We study the secrecy outage performance in two cases: (i) security of...
Secrecy performance of friendly jammer assisted cooperative NOMA systems with internal eavesdroppers
, Article 31st IEEE Annual International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2020, 31 August 2020 through 3 September 2020 ; Volume 2020-August , 2020 ; Aissa, S ; Mirmohseni, M ; Aref, M. R ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2020
Abstract
In non-orthogonal multiple access (NOMA) systems, serving multiple users in shared resource blocks can allow untrusted users to overhear the messages of other users. In this context, we study a network consisting of a base station (BS), a near user and a far user, where the latter attempts to overhear the message of the former. The near user is a full-duplex (FD) node that can also act as a relay. Two operating scenarios are considered: 1) friendly jammer (FJ), where the FD node broadcasts noise for degrading the channel between the BS and the far user, while receiving data from the BS; and 2) friendly jammer relay (FJR), where, in addition to degrading the channel between the BS and the far...
Secure Transmission in Cooperative Non-Orthogonal Multiple Access (NOMA) Systems
, M.Sc. Thesis Sharif University of Technology ; Aref, Mohammad Reza (Supervisor) ; Mirmohseni, Mahtab (Co-Supervisor)
Abstract
Nowadays, number of the users in wireless networks are increasing due to the high speed data transmission. Increasing number of the users increases the required bandwidth and power resource. Using non-orthogonal multiple access (NOMA) is a promising approach to decrease the significant bandwidth and also the required power of the network. NOMA systems decrease the latency of the users and also improve the spectral efficiency by serving multiple users. As signals are transmitting in wireless networks, the internal and also external eavesdroppers have access to the message of the legitimate users in the networks. Therefore, some sort of secrecy of the messages of the users must be provided....