Enhanced Secrecy in Stochastic Wireless Networks: Artificial Noise With Secrecy Protected Zone

• Published in: IEEE transactions on information forensics and security Vol. 9; no. 10; pp. 1617 - 1628
• Main Authors: Seong Ho Chae, Wan Choi, Jung Hoon Lee, Quek, Tony Q. S.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.10.2014; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Allocations; Communication channels; Computer information security; Fading; Interference; Joints; Mathematical models; Networks; Noise; Optimization; Resource management; Security; Signal to noise ratio; Transmitters; Wideband communications; Physical layer security; artificial noise; secrecy protected zone; stochastic geometry; optimal power allocation
• ISSN: 1556-6013; 1556-6021
• DOI: 10.1109/TIFS.2014.2341453

Recently, the use of artificial noise has attracted considerable attention in enhancing the physical-layer security of wireless systems. However, the interaction between artificially generated noise and the inherent network interference can significantly affect the level of secrecy. In this paper, we consider the additional secrecy enhancement with artificial noise and secrecy protected zone in the presence of eavesdroppers and interferers with unknown locations. Specifically, we derive the secrecy transmission rate and investigate the relationship between artificial noise and various system parameters like secrecy protected zone radius and intensity of interferers and eavesdroppers on the secrecy transmission rate. In interference-limited networks, we derive the optimal power allocation between the information-bearing signal and artificial noise to maximize the achievable secrecy transmission rate subject to connection and secrecy outage probabilities. Numerical results show that artificial noise is still beneficial in the presence of inherent network interference to improve secrecy transmission rate and provide rules of thumb to quantify when optimal power allocation is useful.