Abstract
Millimeter-wave (mmWave) communication is one of the key enabling technologies for fifth generation (5G) mobile networks. In this paper, we study the problem of secure communication in a mmWave wiretap network, where directional beamforming and link blockages are taken into account. For the secure transmission in the presence of spatially random eavesdroppers, an adaptive transmission scheme is adopted, for which sector secrecy guard zone and artificial noise (AN) are employed to enhance secrecy performance. When there exists no eavesdroppers within the sector secrecy guard zone, the transmitter only transmits information-bearing signal, and, conversely, AN along with information-bearing signal are transmitted. The closed-form expressions for secrecy outage probability (SOP), connection outage probability (COP) and secrecy throughput are derived under stochastic geometry. Then, we evaluate the effect of the sector secrecy guard zone and AN on the secrecy performance. Our results reveal that the application of the sector secrecy guard zone and AN can significantly improve the security of the system, and blockages also can be utilized to improve secrecy performance. An easy choice of transmit power and power allocation factor is provided for achieving higher secrecy throughput. Furthermore, increasing the density of eavesdroppers not always deteriorates the secrecy performance due to the use of the sector secrecy guard zone and AN.
Highlights
In recent years, data traffic increases significantly with the rapid popularization of various mobile intelligent devices and the growth of wireless data, and millimeter wave communication is an especially promising approach to meet the data traffic demand in the 5G and beyond wireless communication system because of the abundant available bandwidth of mmWave frequency [1,2].There have been plenty of works presented in terms of achievable rate and coverage for mmWave communication system [3,4,5]
Received by the eavesdropper is close to a fixed value from Equation (6), the secrecy outage probability (SOP) remains unchanged and the connection outage probability (COP) of the legitimate receiver is close to zero. This can be explained as follows: on the one hand, the eavesdropper is in the sector guard zone, the system can still guarantee a secure link to a legitimate receiver by transmitting artificial noise (AN) to confuse the eavesdropper
We investigated secrecy performance under the Nakagami fading channel in an mmWave wiretap network
Summary
Data traffic increases significantly with the rapid popularization of various mobile intelligent devices and the growth of wireless data, and millimeter wave (mmWave) communication is an especially promising approach to meet the data traffic demand in the 5G and beyond wireless communication system because of the abundant available bandwidth of mmWave frequency [1,2]. For a mmWave wiretap network, comprehensive secrecy performance analysis has not been provided under a sector secrecy guard zone, which motivates our work. In order to improve the secrecy performance of mmWave wiretap network, a secrecy guard zone is introduced around the transmitter, in which eavesdroppers are not allowed to roam. Based on our previous work, assuming the transmitter is capable of detecting the existence of eavesdroppers in the finite guard zone, an adaptive transmission scheme is adopted for secrecy transmission. We provide a further insight of the system parameters, i.e., transmit power, power allocation factor, secrecy guard zone radius and central angle, blockage density, antenna gain, and the intensity of the eavesdroppers into secrecy performance.
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