Improving Physical-Layer Security in Wireless Communications Using Diversity Techniques - 2015


Because of the published nature of radio propagation, wireless transmission can be readily overheard by unauthorized users for interception purposes and is so highly prone to eavesdropping attacks. To this finish, physical-layer security is rising as a promising paradigm to shield the wireless Communications against eavesdropping attacks by exploiting the physical characteristics of wireless channels. This article is concentrated on the investigation of diversity techniques to boost physical-layer security differently from the standard artificial noise generation and beamforming techniques, which usually consume further power for generating artificial noise and exhibit high implementation complexity for beamformer style. We have a tendency to gift several diversity approaches to boost wireless physical-layer security, as well as multiple-input multiple-output (MIMO), multiuser diversity, and cooperative diversity. To illustrate the protection improvement through diversity, we have a tendency to propose a case study of exploiting cooperative relays to assist the signal transmission from source to destination whereas defending against eavesdropping attacks. We tend to evaluate the protection performance of cooperative relay transmission in Rayleigh fading environments in terms of secrecy capacity and intercept chance. It is shown that as the number of relays increases, each the secrecy capability and intercept chance of cooperative relay transmission improve significantly, implying there's an advantage in exploiting cooperative diversity to improve physical-layer security against eavesdropping attacks.

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