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access icon free Physical-layer information hiding technique for cognitive radio communications in cooperative relaying systems

© The Institution of Engineering and Technology
Received 20/05/2018, Accepted 01/10/2018, Revised 19/08/2018, Published 03/10/2018

This study presents a novel idea for information hiding at the physical layer level in order to securely transmit confidential cognitive radio data in cooperative relaying systems. Considering a cognitive radio network in which the secondary user cooperates with the primary system in relaying its data, in the proposed model, confidential cognitive information is hidden into the primary signal as a low-power noise at a symbol level such that it would be invisible by malicious users. The new hiding algorithm can be utilised along with any standard relaying scheme as long as the primary information signal is used as the cover data without significant degradation of the primary system performance. In the presence of cognitive data hiding, both the frame error rate and throughput performance of the primary and secondary systems are derived analytically for well-known relaying schemes such as fixed and incremental relaying protocols, when a selection-combining rule is utilised at the primary receiver for symbol detection. Using simulation results the correctness of the proposed theoretical analysis is verified. Moreover, using numerical results the existing tradeoff between the hiding cognitive capacity of the proposed model and the performance degradation of the primary system is highlighted.

Inspec keywords: cognitive radio; relay networks (telecommunication); data encapsulation; cooperative communication; telecommunication security; protocols; diversity reception; signal detection

Other keywords: confidential cognitive radio data; primary information signal; symbol level; physical layer level; fixed relaying protocols; cognitive radio communications; malicious users; primary receiver; cognitive data hiding; physical-layer information hiding technique; low-power noise; confidential cognitive information; hiding algorithm; primary systems; standard relaying scheme; secondary user; primary system performance degradation; secondary systems; cognitive radio network; selection-combining rule; symbol detection; throughput performance; cooperative relaying systems; relaying systems; frame error rate; incremental relaying protocols; hiding cognitive capacity

Subjects: Radio links and equipment; Signal detection; Protocols

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