Secrecy outage analysis on underlay cognitive radio using selection combining  

作　　者：Tan Youyu Pan Gaofeng Zhao Hui 

机构地区：[1]School of Electronic and Information Engineering, Southwest University

出　　处：《The Journal of China Universities of Posts and Telecommunications》2016年第3期51-56,共6页中国邮电高校学报（英文版）

基　　金：supported in part by the National Science Foundation (61401372, 61531016);Research Fund for the Doctoral Program of Higher Education of China(20130182120017);Natural Science Foundation of CQ CSTC(cstc2013jcyj A40040);the Fundamental Research Funds for the Central Universities (XDJK2015B023, XDJK2016A011)

摘　　要：Secure data transmission in future high-capacity high-coverage multi-tier hierarchical networks, for which cognitive radio （CR） has emerged as an essential recipe, is of utmost importance. This paper investigates the secrecy outage performance of selection combining （SC） in CR networks （CRNs） over Rayleigh fading channels. In a single-input multiple-output （SIMO） wiretap channel, a secondary user transmits confidential messages to another secondary user, which is equipped with n B （nB ≥1） antennas. Meanwhile, a passive eavesdropper, which is equipped with nE （n E ≥1） antennas, intends to overhear the messages. Both the legal receiver and the eavesdropper adopt SC scheme to process the received multiple signals. The secondary transmitter uses the underlay strategy to guarantee the quality of service of the primary user without spectrum sensing. Compared to the work proposed by Maged Elkashlan et al. in Ref. [ 1 ], we present an alternative method to derive the closed-form expression for the secrecy outage probability （SOP） and develop a simplified SOP when the maximal transmit power at the secondary user is sufficiently high. Our results reveal the impact of the primary network on the secondary network with a multi-antenna wiretap channel and simulations are conducted to validate the accuracy of our proposed analytical models.Secure data transmission in future high-capacity high-coverage multi-tier hierarchical networks, for which cognitive radio （CR） has emerged as an essential recipe, is of utmost importance. This paper investigates the secrecy outage performance of selection combining （SC） in CR networks （CRNs） over Rayleigh fading channels. In a single-input multiple-output （SIMO） wiretap channel, a secondary user transmits confidential messages to another secondary user, which is equipped with n B （nB ≥1） antennas. Meanwhile, a passive eavesdropper, which is equipped with nE （n E ≥1） antennas, intends to overhear the messages. Both the legal receiver and the eavesdropper adopt SC scheme to process the received multiple signals. The secondary transmitter uses the underlay strategy to guarantee the quality of service of the primary user without spectrum sensing. Compared to the work proposed by Maged Elkashlan et al. in Ref. [ 1 ], we present an alternative method to derive the closed-form expression for the secrecy outage probability （SOP） and develop a simplified SOP when the maximal transmit power at the secondary user is sufficiently high. Our results reveal the impact of the primary network on the secondary network with a multi-antenna wiretap channel and simulations are conducted to validate the accuracy of our proposed analytical models.

关 键 词：secrecy outage probability cognitive radio selection combining underlay 

分 类 号：TN925[电子电信—通信与信息系统]