Open AccessSecuring cognitive radio with a combined approach of beamforming and cooperative jamming
Author(s) -
Liu Weigang,
Sarkar Md. Zahurul Islam,
Ratnarajah Tharmalingam,
Du Huiqin
Publication year - 2017
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.2016.0114
Subject(s) - jamming , beamforming , computer science , precoding , interference (communication) , base station , channel state information , cognitive radio , secrecy , channel (broadcasting) , relay , zero forcing precoding , co channel interference , computer network , telecommunications , electronic engineering , wireless , mimo , engineering , computer security , physics , power (physics) , quantum mechanics , thermodynamics
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.