Securing Cognitive Radio with a Combined Approach of Beamforming and Cooperative Jamming

Weigang Liu, Mohammad Zahurul Islam Sarkar, Tharmalingam Ratnarajah, Huiqin Du

Research output: Contribution to journalArticlepeer-review


The authors consider secret communication through a relay-assisted cognitive interference channel in which primary and secondary base stations (SBSs), respectively, communicate with the primary and secondary receivers (PU-Rx and SU-Rx) in the presence of multiple eavesdroppers. An SBS is allowed to transmit simultaneously with the primary base station (PBS). They propose three cooperative jamming (CJ) schemes based on the available channel state information at the base stations and the relay. The proposed CJ schemes are designed to create additional interference in the direction of eavesdroppers without creating any interference to the PU-Rx and the SU-Rx. A combined approach of beamforming and zero-forcing precoding is developed at the PBS, the SBS and the relay to cancel out jamming interference at the PU-Rx and the SU-Rx. The secrecy rate of SU-Rx is calculated with the constraint of maintaining interference temperature at the PU-Rx under a certain threshold. Compared with the direct transmission schemes that are available in the literature, the authors' results show that the approach which combined beamforming and CJ significantly improves the secrecy rate of the cognitive interference channel.
Original languageEnglish
Pages (from-to)1-9
JournalIET Communications
Issue number1
Early online date22 Dec 2016
Publication statusPublished - 2017


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