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Improving Physical Layer Security via TAS and Full-Duplex Artificial-Noise-Added Receiver

Abstract In this paper, we propose a hybrid scheme called transmit antenna selection and receiver’s artificial noise (TAS–rAN) for security enhancement in multiple-input single-output (MISO) wiretap channels. In this scheme, by using TAS protocol, the transmitter selects a single antenna that maximizes the instantaneous signal-to-noise ratio (SNR) at the full-duplex receiver. While the transmitter uses this antenna to transmit secrecy data, the full-duplex receiver would send artificial noise (AN) to confuse the potential eavesdropper. For the proposed protocol, we consider Rayleigh fading channels with different parameters for the main channel and the eavesdropper’s channel, and derive new closed-form expressions for the exact secrecy outage probability and the asymptotic secrecy outage probability. We demonstrate that the proposed TAS–rAN protocol can offer higher secure performances than both existed single TAS and TAS–Alamouti schemes. Comparing to the existing schemes with AN-aided by full-duplex receiver, our TAS–rAN strategy considers the multi-antenna transmitter with TAS protocol, and the secrecy outage probability is improved with increasing the antenna number. The numerical simulation results verify our analysis.