Secrecy-Enhancing Design for Cooperative Downlink and Uplink NOMA With an Untrusted Relay

We investigate a secrecy-enhancing design for cooperative downlink and uplink non-orthogonal multiple access (NOMA) transmissions with an untrusted relay. A source uses the NOMA principle to have downlink and uplink transmissions with a near user and a far user, and the communications between the so...

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Bibliographic Details
Published in:IEEE transactions on communications 2020-03, Vol.68 (3), p.1698-1715
Main Authors: Lv, Lu, Jiang, Hai, Ding, Zhiguo, Yang, Long, Chen, Jian
Format: Article
Language:English
Subjects:
Computer simulation
cooperative jamming
Downlink
Downlinking
Eavesdropping
Jamming
Lower bounds
NOMA
Non-orthogonal multiple access
Nonorthogonal multiple access
physical layer security
Relay
Relays
Resource management
Scaling laws
Secrecy aspects
secrecy sum rate
untrusted relay
Uplink
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Summary:We investigate a secrecy-enhancing design for cooperative downlink and uplink non-orthogonal multiple access (NOMA) transmissions with an untrusted relay. A source uses the NOMA principle to have downlink and uplink transmissions with a near user and a far user, and the communications between the source and the far user are aided by an untrusted relay. To minimize information leakage at the untrusted relay and achieve secure NOMA communications, adaptive downlink and uplink cooperative jamming schemes are proposed, where the far user in downlink and the near user in uplink adaptively emit a jamming signal to the untrusted relay to impair its eavesdropping capability. Both downlink and uplink jamming power are optimized to fully exploit the benefits of the proposed schemes for security enhancement. Then, for each scheme, we quantify the secrecy performance by deriving the ergodic secrecy sum rate lower bound and its scaling law. Finally, computer simulation is used to demonstrate the effectiveness of the proposed adaptive downlink and uplink cooperative jamming schemes and verify the accuracy of the derived analytical results.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2019.2960345