access icon free Relay selection for secrecy improvement in cognitive amplify-and-forward relay networks against multiple eavesdroppers

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 of cognitive transmissions, which would not only cause an extra interference to primary user, but also enhance the possibility of successfully intercepting the cognitive transmissions at an eavesdropper because an improved signal strength is received in this case. The authors propose two relay selection schemes to improve the physical-layer security of cognitive transmissions against eavesdropping attacks, which are referred to as the global and partial channel state information based relay selection, denoted by GCSIbRS and PCSIbRS, respectively. The authors analyse the intercept probability of the proposed GCSIbRS and PCSIbRS, as well as the traditional round-robin and all-relay transmission schemes. It is shown that the proposed GCSIbRS and PCSIbRS schemes both outperform the conventional round-robin and all-relay schemes in terms of their intercept probability performance.

Inspec keywords: amplify and forward communication; cognitive radio; channel capacity; probability; telecommunication security; radio links; wireless channels; relay networks (telecommunication)

Other keywords: secondary destination; intercept probability; partial channel state information based relay selection; secrecy improvement; eavesdropping attack; PCSIbRS; cognitive transmission; CSI; relay selection; global channel state information based relay selection; wiretap channel; maximal instantaneous capacity; cognitive transmission channel capacity improvement; source signal forwarding; physical layer security; multiple eavesdropper; cognitive radio network; GCSIbRS; cognitive amplify-and-forward relay network; secondary relay; signal strength improvement; secondary transmitter; two-hop cognitive link spanning

Subjects: Other topics in statistics; Radio links and equipment

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