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Science China Information Sciences

Physical-layer secrecy outage of spectrum sharing CR systems over fading channels

Hequn Liu, Hui Zhao, Hong Jiang, Chaoqing Tang, Gaofeng Pan, Tingting Li, Yunfei Chen

Published Mar 16, 2016• 15 citations
Publisher
DOI
10.1007/s11432-015-5451-2

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In order to resolve the security issues in 5G and future wireless networks, physical layer security (PLS) and cognitive radio (CR) technologies can be used with non-orthogonal multiple access (NOMA) to greatly improve spectrum efficiency (SE). However, privacy of information is a risk due to resource sharing in CR or NOMA. Protecting sensitive information in CR-inspired NOMA (CR-NOMA) transmissions is possible by utilizing PLS features, whilst NOMA makes use of channel property differences for bandwidth effectiveness. The objective of this work is to examine the level of secrecy achieved in a 5G overlay downlink CR-NOMA network when untrusted users encounter a Rayleigh fading channel. The analysis takes place in both imperfect and perfect successive interference cancellation (SIC) configurations. Additionally, we derive mathematical expressions for the secrecy outage probability (SOP) and, more significantly, the effective secrecy throughput (EST) of the proposed system in order to further improve the performance of users in both fading and non-fading scenarios. In addition, this work offers an optimal power allocation (PA) scheme that primarily considers the specific quality of service (QoS) requirements of two users. Subsequently, it determines the most favorable values for the PA factors in an effort to further improve the performance of secrecy. Furthermore, under perfect/imperfect SIC modes, this work presents the performance comparison between two untrusted users and the derived analytical closed-form expressions were verified via Monte Carlo models employing various channel characteristics.
In limited space scenarios, the antennas in the multiantenna cognitive radio (CR) system are closely spaced and often experience correlation among them. In this work, the secrecy performance of correlated multiantenna CR receiver over Nakagami-m fading channels with imperfect channel state information is studied and analyzed. We consider the underlay CR paradigm wherein Alice in the secondary network communicates with Bob while Eve tries to overhear the communication. We also consider that the antennas at Bob and Eve are closely spaced and thus uniformly correlated. To this extent, we derive the analytical expressions for the first and second order secrecy measures like secrecy outage probability, average secrecy outage rate & average secrecy outage duration, respectively for the CR receiver. Moreover, in order to gain insights at high SNR, asymptotic analysis of secrecy outage probability is derived, thus obtaining the secrecy diversity gain of order LD(i.e., the number of antennas at Bob). Monte Carlo simulations are carried out to validate the proposed analytical framework.
In this paper, we present a method of utilizing channel diversity to improve the secrecy outage probability and the intercept probability in a cognitive radio (CR) network. With the presence of channel diversity, an intended receiver can achieve a relatively better secrecy outage probability and intercept probability. We consider a CR network in which a single antenna, which maximizes the secrecy capacity, is selected at the CR transmitter. To demonstrate the advantages of our proposed framework, we derive new exact closed-form expressions for the secrecy outage probability and the intercept probability of the secondary network in Rayleigh fading. The positive impact of the number of receive antennas and the negative impact of the number of primary users on the secondary network are shown. The derived secrecy outage probability is found to be in precise agreement with simulation results. The numerical results strongly support our conclusion that maximal-ratio combining of channel diversity can enhance the physical layer security of a multiantenna based CR network. Furthermore, the numerical results reveal the impact of the primary network on the secondary network in the presence of a multiantenna wiretap channel.