Open AccessRelay selection for secrecy improvement in cognitive amplify‐and‐forward relay networks against multiple eavesdroppers
Author(s) -
Ding Xiaojin,
Song Tiecheng,
Zou Yulong,
Chen Xiaoshu
Publication year - 2016
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/iet-com.2016.0490
Subject(s) - relay , computer science , cognitive radio , computer network , eavesdropping , relay channel , cognitive network , channel (broadcasting) , physical layer , channel state information , selection (genetic algorithm) , secure transmission , transmission (telecommunications) , transmitter , telecommunications , wireless , power (physics) , artificial intelligence , physics , quantum mechanics
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.