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Indexed by:Journal Papers

Date of Publication:2020-07-01

Journal:IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY

Included Journals:SCIE

Volume:69

Issue:7

Page Number:8008-8012

ISSN No.:0018-9545

Key Words:Jamming; NOMA; Eavesdropping; Interference cancellation; Protocols; Security; Signal to noise ratio; Cooperative relaying; non-orthogonal multiple access; power allocation; secrecy outage probability

Abstract:To enhance the secrecy of wireless transmission, we propose a cooperative user relaying NOMA scheme, in which the near user works in full-duplex mode by transmitting jamming signals and receiving desired signals in the first phase, and the base station sends jamming signals in the second phase. Two power allocation (PA) schemes between the legitimate and jamming signals are designed based on different knowledge of the eavesdropping channel state information (ECSI). The first scheme aims to jam the eavesdropping with highest power while meeting rate requirements without ECSI. In the second scheme, the closed-form expressions of secrecy outage probability (SOP) are first derived using the statistical ECSI. Then, the sum secrecy rate is maximized by optimizing the PA and redundant rate with SOP constraints. Simulation results are provided to show the effectiveness of the proposed schemes.