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This letter presents a performance comparison of two popular secrecyenhancement techniques in wireless networks: (i) creating guard zones byrestricting transmissions of legitimate transmitters whenever any eavesdropperis detected in their vicinity, and (ii) adding artificial noise to theconfidential messages to make it difficult for the eavesdroppers to decodethem. Focusing on a noise-limited regime, we use tools from stochastic geometryto derive the secrecy outage probability at the eavesdroppers as well as thecoverage probability at the legitimate users for both these techniques. Usingthese results, we derive a threshold on the density of the eavesdroppers belowwhich no secrecy enhancing technique is required to ensure a target secrecyoutage probability. For eavesdropper densities above this threshold, weconcretely characterize the regimes in which each technique outperforms theother. Our results demonstrate that guard zone technique is better when thedistances between the transmitters and their legitimate receivers are higherthan a certain threshold.

Stochastic Geometry-based Comparison of Secrecy Enhancement Techniques in D2D Networks