Abstract
Physical layer authentication techniques developed in conventional macrocell wireless networks face challenges when applied in the future fifth-generation (5G) wireless communications, due to the deployment of dense small cells in a hierarchical network architecture. In this paper, we propose a novel physical layer authentication scheme by exploiting the advantages of amplify-and-forward (AF) cooperative relaying, which can increase the coverage and convergence of the heterogeneous networks. The essence of the proposed scheme is to select the best relay among multiple AF relays for cooperation between legitimate transmitter and intended receiver in the presence of a spoofer. To achieve this goal, two best relay selection schemes are developed by maximizing the signal-to-noise ratio (SNR) of the legitimate link to the spoofing link at the destination and relays, respectively. In the sequel, we derive closed-form expressions for the outage probabilities of the effective SNR ratios at the destination. With the help of the best relay, a new test statistic is developed for making an authentication decision, based on normalized channel difference between adjacent end-to-end channel estimates at the destination. The performance of the proposed authentication scheme is compared with that in a direct transmission in terms of outage and spoofing detection.
Highlights
During the recent past, wireless networks have experienced a rapid growth in data traffic which is spurred by an explosive increase in the number of diverse devices
To accommodate such increases in devices in future fifth generation (5G) wireless communications, heterogeneity is expected as an important feature that characterizes the future 5G networks by deploying dense small cells underlaid in macrocell cellular networks with coexistence of device-todevice (D2D) communications [1,2,3,4]
The major contributions of this paper are summarized as follows: (1) We propose two best relay selection schemes based on the notion of maximizing the instantaneous signal-to-noise ratio (SNR) ratios of the legitimate link to the spoofing link at the destination and relays, respectively
Summary
Wireless networks have experienced a rapid growth in data traffic which is spurred by an explosive increase in the number of diverse devices. In order to obtain an efficient and practical physical layer authentication scheme through cooperative relays, relay selection is of significant importance It refers to the process of choosing only one or more than one relay to help to transmit messages between the source and destination. In order to reduce the computational complexity and resource consumption, the second scheme is developed based only on the first-hop instantaneous SNR ratio This is different from the previous work [23,24,25] that exploited the instantaneous SNR of the channel links for relay selection. (3) In order to evaluate the authentication performance of the proposed relay-assisted physical layer authentication scheme, a test statistic is developed based on the end-to-end channel characteristics via the selected best relay.
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