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In this paper, we consider a cognitive radio (CR) network which is made up of multiple secondary users (SUs), a secondary destination (SD) and an eavesdropper (E) which may overhear the legitimate communication between SUs and SD. In order to ensure the secure communication from SUs to SD, we investigate round-robin scheduling and optimal user scheduling to prohibit eavesdropper attacking. In optimal...
In this paper, we investigate a tradeoff between the secrecy rate (SR) and energy efficiency (EE) in an underlay cognitive radio network that consists of a cognitive base station (CBS), a cognitive user (CU), a primary user (PU), and multiple eavesdroppers (EDs). By using a so-called secrecy EE (SEE), which is defined as the ratio of SR to the total power consumption of CBS, as the design criterion,...
In this study, the authors investigate the physical-layer security in a cognitive amplify-and-forward relay network consisting of a secondary transmitter (ST) and a secondary destination (SD) with the aid of multiple secondary relays (SRs) in the face of multiple eavesdroppers. In cognitive radio networks, increasing transmit power may not always be beneficial in terms of improving the channel capacity...
In this paper, we consider a multi-input-multi-output cognitive radio (MIMO-CR) system which consists of one secondary user (SU) and one secondary destination (SD), in which one eavesdropper (E) attempts to tap the information from SU to SD. All of the aforementioned nodes are equipped with multiple antennas. For enhancing physical layer security, we propose so-called optimal antenna selection (OAS)...
Green cognitive radio has attracted significant research attention as an effective means of alleviating spectrum scarcity and energy-saving problem in wireless communications. In this paper, we focus on the power allocation for maximizing the transmission throughput and energy efficiency (EE) of secondary users (SUs). More specifically, we propose a multi-band power allocation scheme, where multiple...
Cognitive radio is a promising technology that enables unlicensed users to communicate with each other over a licensed band (through spectrum holes). Typically, each cognitive transmission process consists of two required phases, i.e., the spectrum sensing and the data transmission phases. To improve the overall system performance of cognitive transmissions, we propose a cognitive relay scheme where...
In cognitive radio networks, a cognitive source node typically requires two essential phases to complete a cognitive transmission process: the phase of spectrum sensing with a certain time duration to detect a spectrum hole (thus also referred to as spectrum hole detection phase) and the phase of data transmission through the detected spectrum hole. In this paper, we focus on the analysis of cognitive...
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